Pullup ticket #6308 - requested by bouyer

sysutils/xenkernel411: security fix

Revisions pulled up:
- sysutils/xenkernel411/Makefile                                1.14
- sysutils/xenkernel411/distinfo                                1.12
- sysutils/xenkernel411/patches/patch-XSA317                    1.1
- sysutils/xenkernel411/patches/patch-XSA319                    1.1
- sysutils/xenkernel411/patches/patch-XSA320                    1.1
- sysutils/xenkernel411/patches/patch-XSA321                    1.1
- sysutils/xenkernel411/patches/patch-XSA328                    1.1

---
   Module Name:	pkgsrc
   Committed By:	bouyer
   Date:		Thu Jul 16 09:57:17 UTC 2020

   Modified Files:
   	pkgsrc/sysutils/xenkernel411: Makefile distinfo
   Added Files:
   	pkgsrc/sysutils/xenkernel411/patches: patch-XSA317 patch-XSA319
   	    patch-XSA320 patch-XSA321 patch-XSA328

   Log Message:
   Add patches for Xen Security Advisories XSA317, XSA319, XSA320, XSA321
   and XSA328
   Bump PKGREVISION

7 files changed, 1259 insertions, 3 deletions

diff --git a/sysutils/xenkernel411/Makefile b/sysutils/xenkernel411/Makefile
index fc723e03fd2..5d3e52698de 100644
--- a/sysutils/xenkernel411/Makefile
+++ b/sysutils/xenkernel411/Makefile
@@ -1,7 +1,7 @@
-# $NetBSD: Makefile,v 1.13 2020/04/15 15:37:19 bouyer Exp $
+# $NetBSD: Makefile,v 1.13.2.1 2020/08/28 15:37:49 bsiegert Exp $
 
 VERSION=	4.11.3
-PKGREVISION=	2
+PKGREVISION=	3
 DISTNAME=	xen-${VERSION}
 PKGNAME=	xenkernel411-${VERSION}
 CATEGORIES=	sysutils
diff --git a/sysutils/xenkernel411/distinfo b/sysutils/xenkernel411/distinfo
index 3e6b77eb141..170ecd307a7 100644
--- a/sysutils/xenkernel411/distinfo
+++ b/sysutils/xenkernel411/distinfo
@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.11 2020/04/15 15:45:04 bouyer Exp $
+$NetBSD: distinfo,v 1.11.2.1 2020/08/28 15:37:49 bsiegert Exp $
 
 SHA1 (xen411/xen-4.11.3.tar.gz) = 2d77152168d6f9dcea50db9cb8e3e6a0720a4a1b
 RMD160 (xen411/xen-4.11.3.tar.gz) = cfb2e699842867b60d25a01963c564a6c5e580da
@@ -12,7 +12,12 @@ SHA1 (patch-XSA310) = 77b711f4b75de1d473a6988eb6f2b48e37cc353a
 SHA1 (patch-XSA311) = 4d3e6cc39c2b95cb3339961271df2bc885667927
 SHA1 (patch-XSA313) = b2f281d6aed1207727cd454dcb5e914c7f6fb44b
 SHA1 (patch-XSA316) = 9cce683315e4c1ca6d53b578e69ae71e1db2b3eb
+SHA1 (patch-XSA317) = 3a3e7bf8f115bebaf56001afcf68c2bd501c00a5
 SHA1 (patch-XSA318) = d0dcbb99ab584098aed7995a7a05d5bf4ac28d47
+SHA1 (patch-XSA319) = 4954bdc849666e1c735c3281256e4850c0594ee8
+SHA1 (patch-XSA320) = 38d84a2ded4ccacee455ba64eb3b369e5661fbfd
+SHA1 (patch-XSA321) = 5281304282a26ee252344ec26b07d25ac4ce8b54
+SHA1 (patch-XSA328) = a9b02c183a5dbfb6c0fe50824f18896fcab4a9e9
 SHA1 (patch-xen_Makefile) = 465388d80de414ca3bb84faefa0f52d817e423a6
 SHA1 (patch-xen_Rules.mk) = c743dc63f51fc280d529a7d9e08650292c171dac
 SHA1 (patch-xen_arch_x86_Rules.mk) = 0bedfc53a128a87b6a249ae04fbdf6a053bfb70b
diff --git a/sysutils/xenkernel411/patches/patch-XSA317 b/sysutils/xenkernel411/patches/patch-XSA317
new file mode 100644
index 00000000000..01cb2cfe696
--- /dev/null
+++ b/sysutils/xenkernel411/patches/patch-XSA317
@@ -0,0 +1,52 @@
+$NetBSD: patch-XSA317,v 1.1.2.2 2020/08/28 15:37:49 bsiegert Exp $
+
+From aeb46e92f915f19a61d5a8a1f4b696793f64e6fb Mon Sep 17 00:00:00 2001
+From: Julien Grall <jgrall@amazon.com>
+Date: Thu, 19 Mar 2020 13:17:31 +0000
+Subject: [PATCH] xen/common: event_channel: Don't ignore error in
+ get_free_port()
+
+Currently, get_free_port() is assuming that the port has been allocated
+when evtchn_allocate_port() is not return -EBUSY.
+
+However, the function may return an error when:
+    - We exhausted all the event channels. This can happen if the limit
+    configured by the administrator for the guest ('max_event_channels'
+    in xl cfg) is higher than the ABI used by the guest. For instance,
+    if the guest is using 2L, the limit should not be higher than 4095.
+    - We cannot allocate memory (e.g Xen has not more memory).
+
+Users of get_free_port() (such as EVTCHNOP_alloc_unbound) will validly
+assuming the port was valid and will next call evtchn_from_port(). This
+will result to a crash as the memory backing the event channel structure
+is not present.
+
+Fixes: 368ae9a05fe ("xen/pvshim: forward evtchn ops between L0 Xen and L2 DomU")
+Signed-off-by: Julien Grall <jgrall@amazon.com>
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+---
+ xen/common/event_channel.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
+index e86e2bfab0..a8d182b584 100644
+--- xen/common/event_channel.c.orig
++++ xen/common/event_channel.c
+@@ -195,10 +195,10 @@ static int get_free_port(struct domain *d)
+     {
+         int rc = evtchn_allocate_port(d, port);
+ 
+-        if ( rc == -EBUSY )
+-            continue;
+-
+-        return port;
++        if ( rc == 0 )
++            return port;
++        else if ( rc != -EBUSY )
++            return rc;
+     }
+ 
+     return -ENOSPC;
+-- 
+2.17.1
+
diff --git a/sysutils/xenkernel411/patches/patch-XSA319 b/sysutils/xenkernel411/patches/patch-XSA319
new file mode 100644
index 00000000000..8aa8776d90d
--- /dev/null
+++ b/sysutils/xenkernel411/patches/patch-XSA319
@@ -0,0 +1,29 @@
+$NetBSD: patch-XSA319,v 1.1.2.2 2020/08/28 15:37:49 bsiegert Exp $
+
+From: Jan Beulich <jbeulich@suse.com>
+Subject: x86/shadow: correct an inverted conditional in dirty VRAM tracking
+
+This originally was "mfn_x(mfn) == INVALID_MFN". Make it like this
+again, taking the opportunity to also drop the unnecessary nearby
+braces.
+
+This is XSA-319.
+
+Fixes: 246a5a3377c2 ("xen: Use a typesafe to define INVALID_MFN")
+Signed-off-by: Jan Beulich <jbeulich@suse.com>
+Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
+
+--- xen/arch/x86/mm/shadow/common.c.orig
++++ xen/arch/x86/mm/shadow/common.c
+@@ -3252,10 +3252,8 @@ int shadow_track_dirty_vram(struct domai
+             int dirty = 0;
+             paddr_t sl1ma = dirty_vram->sl1ma[i];
+ 
+-            if ( !mfn_eq(mfn, INVALID_MFN) )
+-            {
++            if ( mfn_eq(mfn, INVALID_MFN) )
+                 dirty = 1;
+-            }
+             else
+             {
+                 page = mfn_to_page(mfn);
diff --git a/sysutils/xenkernel411/patches/patch-XSA320 b/sysutils/xenkernel411/patches/patch-XSA320
new file mode 100644
index 00000000000..cf6a71a124d
--- /dev/null
+++ b/sysutils/xenkernel411/patches/patch-XSA320
@@ -0,0 +1,371 @@
+$NetBSD: patch-XSA320,v 1.1.2.2 2020/08/28 15:37:49 bsiegert Exp $
+
+From: Andrew Cooper <andrew.cooper3@citrix.com>
+Subject: x86/spec-ctrl: CPUID/MSR definitions for Special Register Buffer Data Sampling
+
+This is part of XSA-320 / CVE-2020-0543
+
+Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+Acked-by: Wei Liu <wl@xen.org>
+
+diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
+index 194615bfc5..9be18ac99f 100644
+--- docs/misc/xen-command-line.markdown.orig
++++ docs/misc/xen-command-line.markdown
+@@ -489,10 +489,10 @@ accounting for hardware capabilities as enumerated via CPUID.
+ 
+ Currently accepted:
+ 
+-The Speculation Control hardware features `md-clear`, `ibrsb`, `stibp`, `ibpb`,
+-`l1d-flush` and `ssbd` are used by default if available and applicable.  They can
+-be ignored, e.g. `no-ibrsb`, at which point Xen won't use them itself, and
+-won't offer them to guests.
++The Speculation Control hardware features `srbds-ctrl`, `md-clear`, `ibrsb`,
++`stibp`, `ibpb`, `l1d-flush` and `ssbd` are used by default if available and
++applicable.  They can be ignored, e.g. `no-ibrsb`, at which point Xen won't
++use them itself, and won't offer them to guests.
+ 
+ ### cpuid\_mask\_cpu (AMD only)
+ > `= fam_0f_rev_c | fam_0f_rev_d | fam_0f_rev_e | fam_0f_rev_f | fam_0f_rev_g | fam_10_rev_b | fam_10_rev_c | fam_11_rev_b`
+diff --git a/tools/libxl/libxl_cpuid.c b/tools/libxl/libxl_cpuid.c
+index 5a1702d703..1235c8b91e 100644
+--- tools/libxl/libxl_cpuid.c.orig
++++ tools/libxl/libxl_cpuid.c
+@@ -202,6 +202,7 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list *cpuid, const char* str)
+ 
+         {"avx512-4vnniw",0x00000007,  0, CPUID_REG_EDX,  2,  1},
+         {"avx512-4fmaps",0x00000007,  0, CPUID_REG_EDX,  3,  1},
++        {"srbds-ctrl",   0x00000007,  0, CPUID_REG_EDX,  9,  1},
+         {"md-clear",     0x00000007,  0, CPUID_REG_EDX, 10,  1},
+         {"ibrsb",        0x00000007,  0, CPUID_REG_EDX, 26,  1},
+         {"stibp",        0x00000007,  0, CPUID_REG_EDX, 27,  1},
+diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c
+index 4c9af6b7f0..8fb54c3001 100644
+--- tools/misc/xen-cpuid.c.orig
++++ tools/misc/xen-cpuid.c
+@@ -142,6 +142,7 @@ static const char *str_7d0[32] =
+ {
+     [ 2] = "avx512_4vnniw", [ 3] = "avx512_4fmaps",
+ 
++    /*  8 */                [ 9] = "srbds-ctrl",
+     [10] = "md-clear",
+     /* 12 */                [13] = "tsx-force-abort",
+ 
+diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
+index 04aefa555d..b8e5b6fe67 100644
+--- xen/arch/x86/cpuid.c.orig
++++ xen/arch/x86/cpuid.c
+@@ -58,6 +58,11 @@ static int __init parse_xen_cpuid(const char *s)
+             if ( !val )
+                 setup_clear_cpu_cap(X86_FEATURE_SSBD);
+         }
++        else if ( (val = parse_boolean("srbds-ctrl", s, ss)) >= 0 )
++        {
++            if ( !val )
++                setup_clear_cpu_cap(X86_FEATURE_SRBDS_CTRL);
++        }
+         else
+             rc = -EINVAL;
+ 
+diff --git a/xen/arch/x86/msr.c b/xen/arch/x86/msr.c
+index ccb316c547..256e58d82b 100644
+--- xen/arch/x86/msr.c.orig
++++ xen/arch/x86/msr.c
+@@ -154,6 +154,7 @@ int guest_rdmsr(const struct vcpu *v, uint32_t msr, uint64_t *val)
+         /* Write-only */
+     case MSR_TSX_FORCE_ABORT:
+     case MSR_TSX_CTRL:
++    case MSR_MCU_OPT_CTRL:
+         /* Not offered to guests. */
+         goto gp_fault;
+ 
+@@ -243,6 +244,7 @@ int guest_wrmsr(struct vcpu *v, uint32_t msr, uint64_t val)
+         /* Read-only */
+     case MSR_TSX_FORCE_ABORT:
+     case MSR_TSX_CTRL:
++    case MSR_MCU_OPT_CTRL:
+         /* Not offered to guests. */
+         goto gp_fault;
+ 
+diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
+index ab196b156d..94ab8dd786 100644
+--- xen/arch/x86/spec_ctrl.c.orig
++++ xen/arch/x86/spec_ctrl.c
+@@ -365,12 +365,13 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps)
+     printk("Speculative mitigation facilities:\n");
+ 
+     /* Hardware features which pertain to speculative mitigations. */
+-    printk("  Hardware features:%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
++    printk("  Hardware features:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
+            (_7d0 & cpufeat_mask(X86_FEATURE_IBRSB)) ? " IBRS/IBPB" : "",
+            (_7d0 & cpufeat_mask(X86_FEATURE_STIBP)) ? " STIBP"     : "",
+            (_7d0 & cpufeat_mask(X86_FEATURE_L1D_FLUSH)) ? " L1D_FLUSH" : "",
+            (_7d0 & cpufeat_mask(X86_FEATURE_SSBD))  ? " SSBD"      : "",
+            (_7d0 & cpufeat_mask(X86_FEATURE_MD_CLEAR)) ? " MD_CLEAR" : "",
++           (_7d0 & cpufeat_mask(X86_FEATURE_SRBDS_CTRL)) ? " SRBDS_CTRL" : "",
+            (e8b  & cpufeat_mask(X86_FEATURE_IBPB))  ? " IBPB"      : "",
+            (caps & ARCH_CAPS_IBRS_ALL)              ? " IBRS_ALL"  : "",
+            (caps & ARCH_CAPS_RDCL_NO)               ? " RDCL_NO"   : "",
+diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
+index 1761a01f1f..480d1d8102 100644
+--- xen/include/asm-x86/msr-index.h.orig
++++ xen/include/asm-x86/msr-index.h
+@@ -177,6 +177,9 @@
+ #define MSR_IA32_VMX_TRUE_ENTRY_CTLS            0x490
+ #define MSR_IA32_VMX_VMFUNC                     0x491
+ 
++#define MSR_MCU_OPT_CTRL                    0x00000123
++#define  MCU_OPT_CTRL_RNGDS_MITG_DIS        (_AC(1, ULL) <<  0)
++
+ /* K7/K8 MSRs. Not complete. See the architecture manual for a more
+    complete list. */
+ #define MSR_K7_EVNTSEL0			0xc0010000
+diff --git a/xen/include/public/arch-x86/cpufeatureset.h b/xen/include/public/arch-x86/cpufeatureset.h
+index a14d8a7013..9d210e74a0 100644
+--- xen/include/public/arch-x86/cpufeatureset.h.orig
++++ xen/include/public/arch-x86/cpufeatureset.h
+@@ -242,6 +242,7 @@ XEN_CPUFEATURE(IBPB,          8*32+12) /*A  IBPB support only (no IBRS, used by
+ /* Intel-defined CPU features, CPUID level 0x00000007:0.edx, word 9 */
+ XEN_CPUFEATURE(AVX512_4VNNIW, 9*32+ 2) /*A  AVX512 Neural Network Instructions */
+ XEN_CPUFEATURE(AVX512_4FMAPS, 9*32+ 3) /*A  AVX512 Multiply Accumulation Single Precision */
++XEN_CPUFEATURE(SRBDS_CTRL,    9*32+ 9) /*   MSR_MCU_OPT_CTRL and RNGDS_MITG_DIS. */
+ XEN_CPUFEATURE(MD_CLEAR,      9*32+10) /*A  VERW clears microarchitectural buffers */
+ XEN_CPUFEATURE(TSX_FORCE_ABORT, 9*32+13) /* MSR_TSX_FORCE_ABORT.RTM_ABORT */
+ XEN_CPUFEATURE(IBRSB,         9*32+26) /*A  IBRS and IBPB support (used by Intel) */
+From: Andrew Cooper <andrew.cooper3@citrix.com>
+Subject: x86/spec-ctrl: Mitigate the Special Register Buffer Data Sampling sidechannel
+
+See patch documentation and comments.
+
+This is part of XSA-320 / CVE-2020-0543
+
+Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
+index 9be18ac99f..3356e59fee 100644
+--- docs/misc/xen-command-line.markdown.orig
++++ docs/misc/xen-command-line.markdown
+@@ -1858,7 +1858,7 @@ false disable the quirk workaround, which is also the default.
+ ### spec-ctrl (x86)
+ > `= List of [ <bool>, xen=<bool>, {pv,hvm,msr-sc,rsb,md-clear}=<bool>,
+ >              bti-thunk=retpoline|lfence|jmp, {ibrs,ibpb,ssbd,eager-fpu,
+->              l1d-flush}=<bool> ]`
++>              l1d-flush,srb-lock}=<bool> ]`
+ 
+ Controls for speculative execution sidechannel mitigations.  By default, Xen
+ will pick the most appropriate mitigations based on compiled in support,
+@@ -1930,6 +1930,12 @@ Irrespective of Xen's setting, the feature is virtualised for HVM guests to
+ use.  By default, Xen will enable this mitigation on hardware believed to be
+ vulnerable to L1TF.
+ 
++On hardware supporting SRBDS_CTRL, the `srb-lock=` option can be used to force
++or prevent Xen from protect the Special Register Buffer from leaking stale
++data. By default, Xen will enable this mitigation, except on parts where MDS
++is fixed and TAA is fixed/mitigated (in which case, there is believed to be no
++way for an attacker to obtain the stale data).
++
+ ### sync\_console
+ > `= <boolean>`
+ 
+diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c
+index 4c12794809..30e1bd5cd3 100644
+--- xen/arch/x86/acpi/power.c.orig
++++ xen/arch/x86/acpi/power.c
+@@ -266,6 +266,9 @@ static int enter_state(u32 state)
+     ci->spec_ctrl_flags |= (default_spec_ctrl_flags & SCF_ist_wrmsr);
+     spec_ctrl_exit_idle(ci);
+ 
++    if ( boot_cpu_has(X86_FEATURE_SRBDS_CTRL) )
++        wrmsrl(MSR_MCU_OPT_CTRL, default_xen_mcu_opt_ctrl);
++
+  done:
+     spin_debug_enable();
+     local_irq_restore(flags);
+diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
+index 0887806e85..d24d215946 100644
+--- xen/arch/x86/smpboot.c.orig
++++ xen/arch/x86/smpboot.c
+@@ -369,12 +369,14 @@ void start_secondary(void *unused)
+         microcode_resume_cpu(cpu);
+ 
+     /*
+-     * If MSR_SPEC_CTRL is available, apply Xen's default setting and discard
+-     * any firmware settings.  Note: MSR_SPEC_CTRL may only become available
+-     * after loading microcode.
++     * If any speculative control MSRs are available, apply Xen's default
++     * settings.  Note: These MSRs may only become available after loading
++     * microcode.
+      */
+     if ( boot_cpu_has(X86_FEATURE_IBRSB) )
+         wrmsrl(MSR_SPEC_CTRL, default_xen_spec_ctrl);
++    if ( boot_cpu_has(X86_FEATURE_SRBDS_CTRL) )
++        wrmsrl(MSR_MCU_OPT_CTRL, default_xen_mcu_opt_ctrl);
+ 
+     tsx_init(); /* Needs microcode.  May change HLE/RTM feature bits. */
+ 
+diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
+index 94ab8dd786..a306d10c34 100644
+--- xen/arch/x86/spec_ctrl.c.orig
++++ xen/arch/x86/spec_ctrl.c
+@@ -63,6 +63,9 @@ static unsigned int __initdata l1d_maxphysaddr;
+ static bool __initdata cpu_has_bug_msbds_only; /* => minimal HT impact. */
+ static bool __initdata cpu_has_bug_mds; /* Any other M{LP,SB,FB}DS combination. */
+ 
++static int8_t __initdata opt_srb_lock = -1;
++uint64_t __read_mostly default_xen_mcu_opt_ctrl;
++
+ static int __init parse_bti(const char *s)
+ {
+     const char *ss;
+@@ -166,6 +169,7 @@ static int __init parse_spec_ctrl(const char *s)
+             opt_ibpb = false;
+             opt_ssbd = false;
+             opt_l1d_flush = 0;
++            opt_srb_lock = 0;
+         }
+         else if ( val > 0 )
+             rc = -EINVAL;
+@@ -231,6 +235,8 @@ static int __init parse_spec_ctrl(const char *s)
+             opt_eager_fpu = val;
+         else if ( (val = parse_boolean("l1d-flush", s, ss)) >= 0 )
+             opt_l1d_flush = val;
++        else if ( (val = parse_boolean("srb-lock", s, ss)) >= 0 )
++            opt_srb_lock = val;
+         else
+             rc = -EINVAL;
+ 
+@@ -394,7 +400,7 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps)
+                "\n");
+ 
+     /* Settings for Xen's protection, irrespective of guests. */
+-    printk("  Xen settings: BTI-Thunk %s, SPEC_CTRL: %s%s%s, Other:%s%s%s\n",
++    printk("  Xen settings: BTI-Thunk %s, SPEC_CTRL: %s%s%s, Other:%s%s%s%s\n",
+            thunk == THUNK_NONE      ? "N/A" :
+            thunk == THUNK_RETPOLINE ? "RETPOLINE" :
+            thunk == THUNK_LFENCE    ? "LFENCE" :
+@@ -405,6 +411,8 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps)
+            (default_xen_spec_ctrl & SPEC_CTRL_SSBD)  ? " SSBD+" : " SSBD-",
+            !(caps & ARCH_CAPS_TSX_CTRL)              ? "" :
+            (opt_tsx & 1)                             ? " TSX+" : " TSX-",
++           !boot_cpu_has(X86_FEATURE_SRBDS_CTRL)     ? "" :
++           opt_srb_lock                              ? " SRB_LOCK+" : " SRB_LOCK-",
+            opt_ibpb                                  ? " IBPB"  : "",
+            opt_l1d_flush                             ? " L1D_FLUSH" : "",
+            opt_md_clear_pv || opt_md_clear_hvm       ? " VERW"  : "");
+@@ -1196,6 +1204,34 @@ void __init init_speculation_mitigations(void)
+         tsx_init();
+     }
+ 
++    /* Calculate suitable defaults for MSR_MCU_OPT_CTRL */
++    if ( boot_cpu_has(X86_FEATURE_SRBDS_CTRL) )
++    {
++        uint64_t val;
++
++        rdmsrl(MSR_MCU_OPT_CTRL, val);
++
++        /*
++         * On some SRBDS-affected hardware, it may be safe to relax srb-lock
++         * by default.
++         *
++         * On parts which enumerate MDS_NO and not TAA_NO, TSX is the only way
++         * to access the Fill Buffer.  If TSX isn't available (inc. SKU
++         * reasons on some models), or TSX is explicitly disabled, then there
++         * is no need for the extra overhead to protect RDRAND/RDSEED.
++         */
++        if ( opt_srb_lock == -1 &&
++             (caps & (ARCH_CAPS_MDS_NO|ARCH_CAPS_TAA_NO)) == ARCH_CAPS_MDS_NO &&
++             (!cpu_has_hle || ((caps & ARCH_CAPS_TSX_CTRL) && opt_tsx == 0)) )
++            opt_srb_lock = 0;
++
++        val &= ~MCU_OPT_CTRL_RNGDS_MITG_DIS;
++        if ( !opt_srb_lock )
++            val |= MCU_OPT_CTRL_RNGDS_MITG_DIS;
++
++        default_xen_mcu_opt_ctrl = val;
++    }
++
+     print_details(thunk, caps);
+ 
+     /*
+@@ -1227,6 +1263,9 @@ void __init init_speculation_mitigations(void)
+ 
+         wrmsrl(MSR_SPEC_CTRL, bsp_delay_spec_ctrl ? 0 : default_xen_spec_ctrl);
+     }
++
++    if ( boot_cpu_has(X86_FEATURE_SRBDS_CTRL) )
++        wrmsrl(MSR_MCU_OPT_CTRL, default_xen_mcu_opt_ctrl);
+ }
+ 
+ static void __init __maybe_unused build_assertions(void)
+diff --git a/xen/include/asm-x86/spec_ctrl.h b/xen/include/asm-x86/spec_ctrl.h
+index 333d180b7e..bf10d2ce5c 100644
+--- xen/include/asm-x86/spec_ctrl.h.orig
++++ xen/include/asm-x86/spec_ctrl.h
+@@ -46,6 +46,8 @@ extern int8_t opt_pv_l1tf_hwdom, opt_pv_l1tf_domu;
+  */
+ extern paddr_t l1tf_addr_mask, l1tf_safe_maddr;
+ 
++extern uint64_t default_xen_mcu_opt_ctrl;
++
+ static inline void init_shadow_spec_ctrl_state(void)
+ {
+     struct cpu_info *info = get_cpu_info();
+From: Andrew Cooper <andrew.cooper3@citrix.com>
+Subject: x86/spec-ctrl: Allow the RDRAND/RDSEED features to be hidden
+
+RDRAND/RDSEED can be hidden using cpuid= to mitigate SRBDS if microcode
+isn't available.
+
+This is part of XSA-320 / CVE-2020-0543.
+
+Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
+Acked-by: Julien Grall <jgrall@amazon.com>
+
+diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
+index 3356e59fee..ac397e7de0 100644
+--- docs/misc/xen-command-line.markdown.orig
++++ docs/misc/xen-command-line.markdown
+@@ -487,12 +487,18 @@ choice of `dom0-kernel` is deprecated and not supported by all Dom0 kernels.
+ This option allows for fine tuning of the facilities Xen will use, after
+ accounting for hardware capabilities as enumerated via CPUID.
+ 
++Unless otherwise noted, options only have any effect in their negative form,
++to hide the named feature(s).  Ignoring a feature using this mechanism will
++cause Xen not to use the feature, nor offer them as usable to guests.
++
+ Currently accepted:
+ 
+ The Speculation Control hardware features `srbds-ctrl`, `md-clear`, `ibrsb`,
+ `stibp`, `ibpb`, `l1d-flush` and `ssbd` are used by default if available and
+-applicable.  They can be ignored, e.g. `no-ibrsb`, at which point Xen won't
+-use them itself, and won't offer them to guests.
++applicable.  They can all be ignored.
++
++`rdrand` and `rdseed` can be ignored, as a mitigation to XSA-320 /
++CVE-2020-0543.
+ 
+ ### cpuid\_mask\_cpu (AMD only)
+ > `= fam_0f_rev_c | fam_0f_rev_d | fam_0f_rev_e | fam_0f_rev_f | fam_0f_rev_g | fam_10_rev_b | fam_10_rev_c | fam_11_rev_b`
+diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
+index b8e5b6fe67..78d08dbb32 100644
+--- xen/arch/x86/cpuid.c.orig
++++ xen/arch/x86/cpuid.c
+@@ -63,6 +63,16 @@ static int __init parse_xen_cpuid(const char *s)
+             if ( !val )
+                 setup_clear_cpu_cap(X86_FEATURE_SRBDS_CTRL);
+         }
++        else if ( (val = parse_boolean("rdrand", s, ss)) >= 0 )
++        {
++            if ( !val )
++                setup_clear_cpu_cap(X86_FEATURE_RDRAND);
++        }
++        else if ( (val = parse_boolean("rdseed", s, ss)) >= 0 )
++        {
++            if ( !val )
++                setup_clear_cpu_cap(X86_FEATURE_RDSEED);
++        }
+         else
+             rc = -EINVAL;
+ 
diff --git a/sysutils/xenkernel411/patches/patch-XSA321 b/sysutils/xenkernel411/patches/patch-XSA321
new file mode 100644
index 00000000000..97c42b50a3f
--- /dev/null
+++ b/sysutils/xenkernel411/patches/patch-XSA321
@@ -0,0 +1,586 @@
+$NetBSD: patch-XSA321,v 1.2.2.2 2020/08/28 15:37:49 bsiegert Exp $
+
+From: Jan Beulich <jbeulich@suse.com>
+Subject: vtd: improve IOMMU TLB flush
+
+Do not limit PSI flushes to order 0 pages, in order to avoid doing a
+full TLB flush if the passed in page has an order greater than 0 and
+is aligned. Should increase the performance of IOMMU TLB flushes when
+dealing with page orders greater than 0.
+
+This is part of XSA-321.
+
+Signed-off-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/drivers/passthrough/vtd/iommu.c.orig
++++ xen/drivers/passthrough/vtd/iommu.c
+@@ -612,13 +612,14 @@ static int __must_check iommu_flush_iotl
+         if ( iommu_domid == -1 )
+             continue;
+ 
+-        if ( page_count != 1 || gfn == gfn_x(INVALID_GFN) )
++        if ( !page_count || (page_count & (page_count - 1)) ||
++             gfn == gfn_x(INVALID_GFN) || !IS_ALIGNED(gfn, page_count) )
+             rc = iommu_flush_iotlb_dsi(iommu, iommu_domid,
+                                        0, flush_dev_iotlb);
+         else
+             rc = iommu_flush_iotlb_psi(iommu, iommu_domid,
+                                        (paddr_t)gfn << PAGE_SHIFT_4K,
+-                                       PAGE_ORDER_4K,
++                                       get_order_from_pages(page_count),
+                                        !dma_old_pte_present,
+                                        flush_dev_iotlb);
+ 
+From: <security@xenproject.org>
+Subject: vtd: prune (and rename) cache flush functions
+
+Rename __iommu_flush_cache to iommu_sync_cache and remove
+iommu_flush_cache_page. Also remove the iommu_flush_cache_entry
+wrapper and just use iommu_sync_cache instead. Note the _entry suffix
+was meaningless as the wrapper was already taking a size parameter in
+bytes. While there also constify the addr parameter.
+
+No functional change intended.
+
+This is part of XSA-321.
+
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/drivers/passthrough/vtd/extern.h.orig
++++ xen/drivers/passthrough/vtd/extern.h
+@@ -37,8 +37,7 @@ void disable_qinval(struct iommu *iommu)
+ int enable_intremap(struct iommu *iommu, int eim);
+ void disable_intremap(struct iommu *iommu);
+ 
+-void iommu_flush_cache_entry(void *addr, unsigned int size);
+-void iommu_flush_cache_page(void *addr, unsigned long npages);
++void iommu_sync_cache(const void *addr, unsigned int size);
+ int iommu_alloc(struct acpi_drhd_unit *drhd);
+ void iommu_free(struct acpi_drhd_unit *drhd);
+ 
+--- xen/drivers/passthrough/vtd/intremap.c.orig
++++ xen/drivers/passthrough/vtd/intremap.c
+@@ -231,7 +231,7 @@ static void free_remap_entry(struct iomm
+                      iremap_entries, iremap_entry);
+ 
+     update_irte(iommu, iremap_entry, &new_ire, false);
+-    iommu_flush_cache_entry(iremap_entry, sizeof(*iremap_entry));
++    iommu_sync_cache(iremap_entry, sizeof(*iremap_entry));
+     iommu_flush_iec_index(iommu, 0, index);
+ 
+     unmap_vtd_domain_page(iremap_entries);
+@@ -403,7 +403,7 @@ static int ioapic_rte_to_remap_entry(str
+     }
+ 
+     update_irte(iommu, iremap_entry, &new_ire, !init);
+-    iommu_flush_cache_entry(iremap_entry, sizeof(*iremap_entry));
++    iommu_sync_cache(iremap_entry, sizeof(*iremap_entry));
+     iommu_flush_iec_index(iommu, 0, index);
+ 
+     unmap_vtd_domain_page(iremap_entries);
+@@ -694,7 +694,7 @@ static int msi_msg_to_remap_entry(
+     update_irte(iommu, iremap_entry, &new_ire, msi_desc->irte_initialized);
+     msi_desc->irte_initialized = true;
+ 
+-    iommu_flush_cache_entry(iremap_entry, sizeof(*iremap_entry));
++    iommu_sync_cache(iremap_entry, sizeof(*iremap_entry));
+     iommu_flush_iec_index(iommu, 0, index);
+ 
+     unmap_vtd_domain_page(iremap_entries);
+--- xen/drivers/passthrough/vtd/iommu.c.orig
++++ xen/drivers/passthrough/vtd/iommu.c
+@@ -158,7 +158,8 @@ static void __init free_intel_iommu(stru
+ }
+ 
+ static int iommus_incoherent;
+-static void __iommu_flush_cache(void *addr, unsigned int size)
++
++void iommu_sync_cache(const void *addr, unsigned int size)
+ {
+     int i;
+     static unsigned int clflush_size = 0;
+@@ -173,16 +174,6 @@ static void __iommu_flush_cache(void *ad
+         cacheline_flush((char *)addr + i);
+ }
+ 
+-void iommu_flush_cache_entry(void *addr, unsigned int size)
+-{
+-    __iommu_flush_cache(addr, size);
+-}
+-
+-void iommu_flush_cache_page(void *addr, unsigned long npages)
+-{
+-    __iommu_flush_cache(addr, PAGE_SIZE * npages);
+-}
+-
+ /* Allocate page table, return its machine address */
+ u64 alloc_pgtable_maddr(struct acpi_drhd_unit *drhd, unsigned long npages)
+ {
+@@ -207,7 +198,7 @@ u64 alloc_pgtable_maddr(struct acpi_drhd
+         vaddr = __map_domain_page(cur_pg);
+         memset(vaddr, 0, PAGE_SIZE);
+ 
+-        iommu_flush_cache_page(vaddr, 1);
++        iommu_sync_cache(vaddr, PAGE_SIZE);
+         unmap_domain_page(vaddr);
+         cur_pg++;
+     }
+@@ -242,7 +233,7 @@ static u64 bus_to_context_maddr(struct i
+         }
+         set_root_value(*root, maddr);
+         set_root_present(*root);
+-        iommu_flush_cache_entry(root, sizeof(struct root_entry));
++        iommu_sync_cache(root, sizeof(struct root_entry));
+     }
+     maddr = (u64) get_context_addr(*root);
+     unmap_vtd_domain_page(root_entries);
+@@ -300,7 +291,7 @@ static u64 addr_to_dma_page_maddr(struct
+              */
+             dma_set_pte_readable(*pte);
+             dma_set_pte_writable(*pte);
+-            iommu_flush_cache_entry(pte, sizeof(struct dma_pte));
++            iommu_sync_cache(pte, sizeof(struct dma_pte));
+         }
+ 
+         if ( level == 2 )
+@@ -674,7 +665,7 @@ static int __must_check dma_pte_clear_on
+ 
+     dma_clear_pte(*pte);
+     spin_unlock(&hd->arch.mapping_lock);
+-    iommu_flush_cache_entry(pte, sizeof(struct dma_pte));
++    iommu_sync_cache(pte, sizeof(struct dma_pte));
+ 
+     if ( !this_cpu(iommu_dont_flush_iotlb) )
+         rc = iommu_flush_iotlb_pages(domain, addr >> PAGE_SHIFT_4K, 1);
+@@ -716,7 +707,7 @@ static void iommu_free_page_table(struct
+             iommu_free_pagetable(dma_pte_addr(*pte), next_level);
+ 
+         dma_clear_pte(*pte);
+-        iommu_flush_cache_entry(pte, sizeof(struct dma_pte));
++        iommu_sync_cache(pte, sizeof(struct dma_pte));
+     }
+ 
+     unmap_vtd_domain_page(pt_vaddr);
+@@ -1449,7 +1440,7 @@ int domain_context_mapping_one(
+     context_set_address_width(*context, agaw);
+     context_set_fault_enable(*context);
+     context_set_present(*context);
+-    iommu_flush_cache_entry(context, sizeof(struct context_entry));
++    iommu_sync_cache(context, sizeof(struct context_entry));
+     spin_unlock(&iommu->lock);
+ 
+     /* Context entry was previously non-present (with domid 0). */
+@@ -1602,7 +1593,7 @@ int domain_context_unmap_one(
+ 
+     context_clear_present(*context);
+     context_clear_entry(*context);
+-    iommu_flush_cache_entry(context, sizeof(struct context_entry));
++    iommu_sync_cache(context, sizeof(struct context_entry));
+ 
+     iommu_domid= domain_iommu_domid(domain, iommu);
+     if ( iommu_domid == -1 )
+@@ -1828,7 +1819,7 @@ static int __must_check intel_iommu_map_
+ 
+     *pte = new;
+ 
+-    iommu_flush_cache_entry(pte, sizeof(struct dma_pte));
++    iommu_sync_cache(pte, sizeof(struct dma_pte));
+     spin_unlock(&hd->arch.mapping_lock);
+     unmap_vtd_domain_page(page);
+ 
+@@ -1862,7 +1853,7 @@ int iommu_pte_flush(struct domain *d, u6
+     int iommu_domid;
+     int rc = 0;
+ 
+-    iommu_flush_cache_entry(pte, sizeof(struct dma_pte));
++    iommu_sync_cache(pte, sizeof(struct dma_pte));
+ 
+     for_each_drhd_unit ( drhd )
+     {
+From: <security@xenproject.org>
+Subject: x86/iommu: introduce a cache sync hook
+
+The hook is only implemented for VT-d and it uses the already existing
+iommu_sync_cache function present in VT-d code. The new hook is
+added so that the cache can be flushed by code outside of VT-d when
+using shared page tables.
+
+Note that alloc_pgtable_maddr must use the now locally defined
+sync_cache function, because IOMMU ops are not yet setup the first
+time the function gets called during IOMMU initialization.
+
+No functional change intended.
+
+This is part of XSA-321.
+
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/drivers/passthrough/vtd/extern.h.orig
++++ xen/drivers/passthrough/vtd/extern.h
+@@ -37,7 +37,6 @@ void disable_qinval(struct iommu *iommu)
+ int enable_intremap(struct iommu *iommu, int eim);
+ void disable_intremap(struct iommu *iommu);
+ 
+-void iommu_sync_cache(const void *addr, unsigned int size);
+ int iommu_alloc(struct acpi_drhd_unit *drhd);
+ void iommu_free(struct acpi_drhd_unit *drhd);
+ 
+--- xen/drivers/passthrough/vtd/iommu.c.orig
++++ xen/drivers/passthrough/vtd/iommu.c
+@@ -159,7 +159,7 @@ static void __init free_intel_iommu(stru
+ 
+ static int iommus_incoherent;
+ 
+-void iommu_sync_cache(const void *addr, unsigned int size)
++static void sync_cache(const void *addr, unsigned int size)
+ {
+     int i;
+     static unsigned int clflush_size = 0;
+@@ -198,7 +198,7 @@ u64 alloc_pgtable_maddr(struct acpi_drhd
+         vaddr = __map_domain_page(cur_pg);
+         memset(vaddr, 0, PAGE_SIZE);
+ 
+-        iommu_sync_cache(vaddr, PAGE_SIZE);
++        sync_cache(vaddr, PAGE_SIZE);
+         unmap_domain_page(vaddr);
+         cur_pg++;
+     }
+@@ -2760,6 +2760,7 @@ const struct iommu_ops intel_iommu_ops =
+     .iotlb_flush_all = iommu_flush_iotlb_all,
+     .get_reserved_device_memory = intel_iommu_get_reserved_device_memory,
+     .dump_p2m_table = vtd_dump_p2m_table,
++    .sync_cache = sync_cache,
+ };
+ 
+ /*
+--- xen/include/asm-x86/iommu.h.orig
++++ xen/include/asm-x86/iommu.h
+@@ -98,6 +98,13 @@ extern bool untrusted_msi;
+ int pi_update_irte(const struct pi_desc *pi_desc, const struct pirq *pirq,
+                    const uint8_t gvec);
+ 
++#define iommu_sync_cache(addr, size) ({                 \
++    const struct iommu_ops *ops = iommu_get_ops();      \
++                                                        \
++    if ( ops->sync_cache )                              \
++        ops->sync_cache(addr, size);                    \
++})
++
+ #endif /* !__ARCH_X86_IOMMU_H__ */
+ /*
+  * Local variables:
+--- xen/include/xen/iommu.h.orig
++++ xen/include/xen/iommu.h
+@@ -161,6 +161,7 @@ struct iommu_ops {
+     void (*update_ire_from_apic)(unsigned int apic, unsigned int reg, unsigned int value);
+     unsigned int (*read_apic_from_ire)(unsigned int apic, unsigned int reg);
+     int (*setup_hpet_msi)(struct msi_desc *);
++    void (*sync_cache)(const void *addr, unsigned int size);
+ #endif /* CONFIG_X86 */
+     int __must_check (*suspend)(void);
+     void (*resume)(void);
+From: <security@xenproject.org>
+Subject: vtd: don't assume addresses are aligned in sync_cache
+
+Current code in sync_cache assume that the address passed in is
+aligned to a cache line size. Fix the code to support passing in
+arbitrary addresses not necessarily aligned to a cache line size.
+
+This is part of XSA-321.
+
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/drivers/passthrough/vtd/iommu.c.orig
++++ xen/drivers/passthrough/vtd/iommu.c
+@@ -161,8 +161,8 @@ static int iommus_incoherent;
+ 
+ static void sync_cache(const void *addr, unsigned int size)
+ {
+-    int i;
+-    static unsigned int clflush_size = 0;
++    static unsigned long clflush_size = 0;
++    const void *end = addr + size;
+ 
+     if ( !iommus_incoherent )
+         return;
+@@ -170,8 +170,9 @@ static void sync_cache(const void *addr,
+     if ( clflush_size == 0 )
+         clflush_size = get_cache_line_size();
+ 
+-    for ( i = 0; i < size; i += clflush_size )
+-        cacheline_flush((char *)addr + i);
++    addr -= (unsigned long)addr & (clflush_size - 1);
++    for ( ; addr < end; addr += clflush_size )
++        cacheline_flush((char *)addr);
+ }
+ 
+ /* Allocate page table, return its machine address */
+From: <security@xenproject.org>
+Subject: x86/alternative: introduce alternative_2
+
+It's based on alternative_io_2 without inputs or outputs but with an
+added memory clobber.
+
+This is part of XSA-321.
+
+Acked-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/include/asm-x86/alternative.h.orig
++++ xen/include/asm-x86/alternative.h
+@@ -113,6 +113,11 @@ extern void alternative_instructions(voi
+ #define alternative(oldinstr, newinstr, feature)                        \
+         asm volatile (ALTERNATIVE(oldinstr, newinstr, feature) : : : "memory")
+ 
++#define alternative_2(oldinstr, newinstr1, feature1, newinstr2, feature2) \
++	asm volatile (ALTERNATIVE_2(oldinstr, newinstr1, feature1,	\
++				    newinstr2, feature2)		\
++		      : : : "memory")
++
+ /*
+  * Alternative inline assembly with input.
+  *
+From: <security@xenproject.org>
+Subject: vtd: optimize CPU cache sync
+
+Some VT-d IOMMUs are non-coherent, which requires a cache write back
+in order for the changes made by the CPU to be visible to the IOMMU.
+This cache write back was unconditionally done using clflush, but there are
+other more efficient instructions to do so, hence implement support
+for them using the alternative framework.
+
+This is part of XSA-321.
+
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/drivers/passthrough/vtd/extern.h.orig
++++ xen/drivers/passthrough/vtd/extern.h
+@@ -63,7 +63,6 @@ int __must_check qinval_device_iotlb_syn
+                                           u16 did, u16 size, u64 addr);
+ 
+ unsigned int get_cache_line_size(void);
+-void cacheline_flush(char *);
+ void flush_all_cache(void);
+ 
+ u64 alloc_pgtable_maddr(struct acpi_drhd_unit *drhd, unsigned long npages);
+--- xen/drivers/passthrough/vtd/iommu.c.orig
++++ xen/drivers/passthrough/vtd/iommu.c
+@@ -31,6 +31,7 @@
+ #include <xen/pci_regs.h>
+ #include <xen/keyhandler.h>
+ #include <asm/msi.h>
++#include <asm/nops.h>
+ #include <asm/irq.h>
+ #include <asm/hvm/vmx/vmx.h>
+ #include <asm/p2m.h>
+@@ -172,7 +173,42 @@ static void sync_cache(const void *addr,
+ 
+     addr -= (unsigned long)addr & (clflush_size - 1);
+     for ( ; addr < end; addr += clflush_size )
+-        cacheline_flush((char *)addr);
++/*
++ * The arguments to a macro must not include preprocessor directives. Doing so
++ * results in undefined behavior, so we have to create some defines here in
++ * order to avoid it.
++ */
++#if defined(HAVE_AS_CLWB)
++# define CLWB_ENCODING "clwb %[p]"
++#elif defined(HAVE_AS_XSAVEOPT)
++# define CLWB_ENCODING "data16 xsaveopt %[p]" /* clwb */
++#else
++# define CLWB_ENCODING ".byte 0x66, 0x0f, 0xae, 0x30" /* clwb (%%rax) */
++#endif
++
++#define BASE_INPUT(addr) [p] "m" (*(const char *)(addr))
++#if defined(HAVE_AS_CLWB) || defined(HAVE_AS_XSAVEOPT)
++# define INPUT BASE_INPUT
++#else
++# define INPUT(addr) "a" (addr), BASE_INPUT(addr)
++#endif
++        /*
++         * Note regarding the use of NOP_DS_PREFIX: it's faster to do a clflush
++         * + prefix than a clflush + nop, and hence the prefix is added instead
++         * of letting the alternative framework fill the gap by appending nops.
++         */
++        alternative_io_2(".byte " __stringify(NOP_DS_PREFIX) "; clflush %[p]",
++                         "data16 clflush %[p]", /* clflushopt */
++                         X86_FEATURE_CLFLUSHOPT,
++                         CLWB_ENCODING,
++                         X86_FEATURE_CLWB, /* no outputs */,
++                         INPUT(addr));
++#undef INPUT
++#undef BASE_INPUT
++#undef CLWB_ENCODING
++
++    alternative_2("", "sfence", X86_FEATURE_CLFLUSHOPT,
++                      "sfence", X86_FEATURE_CLWB);
+ }
+ 
+ /* Allocate page table, return its machine address */
+--- xen/drivers/passthrough/vtd/x86/vtd.c.orig
++++ xen/drivers/passthrough/vtd/x86/vtd.c
+@@ -53,11 +53,6 @@ unsigned int get_cache_line_size(void)
+     return ((cpuid_ebx(1) >> 8) & 0xff) * 8;
+ }
+ 
+-void cacheline_flush(char * addr)
+-{
+-    clflush(addr);
+-}
+-
+ void flush_all_cache()
+ {
+     wbinvd();
+From: <security@xenproject.org>
+Subject: x86/ept: flush cache when modifying PTEs and sharing page tables
+
+Modifications made to the page tables by EPT code need to be written
+to memory when the page tables are shared with the IOMMU, as Intel
+IOMMUs can be non-coherent and thus require changes to be written to
+memory in order to be visible to the IOMMU.
+
+In order to achieve this make sure data is written back to memory
+after writing an EPT entry when the recalc bit is not set in
+atomic_write_ept_entry. If such bit is set, the entry will be
+adjusted and atomic_write_ept_entry will be called a second time
+without the recalc bit set. Note that when splitting a super page the
+new tables resulting of the split should also be written back.
+
+Failure to do so can allow devices behind the IOMMU access to the
+stale super page, or cause coherency issues as changes made by the
+processor to the page tables are not visible to the IOMMU.
+
+This allows to remove the VT-d specific iommu_pte_flush helper, since
+the cache write back is now performed by atomic_write_ept_entry, and
+hence iommu_iotlb_flush can be used to flush the IOMMU TLB. The newly
+used method (iommu_iotlb_flush) can result in less flushes, since it
+might sometimes be called rightly with 0 flags, in which case it
+becomes a no-op.
+
+This is part of XSA-321.
+
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/arch/x86/mm/p2m-ept.c.orig
++++ xen/arch/x86/mm/p2m-ept.c
+@@ -90,6 +90,19 @@ static int atomic_write_ept_entry(ept_en
+ 
+     write_atomic(&entryptr->epte, new.epte);
+ 
++    /*
++     * The recalc field on the EPT is used to signal either that a
++     * recalculation of the EMT field is required (which doesn't effect the
++     * IOMMU), or a type change. Type changes can only be between ram_rw,
++     * logdirty and ioreq_server: changes to/from logdirty won't work well with
++     * an IOMMU anyway, as IOMMU #PFs are not synchronous and will lead to
++     * aborts, and changes to/from ioreq_server are already fully flushed
++     * before returning to guest context (see
++     * XEN_DMOP_map_mem_type_to_ioreq_server).
++     */
++    if ( !new.recalc && iommu_hap_pt_share )
++        iommu_sync_cache(entryptr, sizeof(*entryptr));
++
+     if ( unlikely(oldmfn != mfn_x(INVALID_MFN)) )
+         put_page(mfn_to_page(_mfn(oldmfn)));
+ 
+@@ -319,6 +332,9 @@ static bool_t ept_split_super_page(struc
+             break;
+     }
+ 
++    if ( iommu_hap_pt_share )
++        iommu_sync_cache(table, EPT_PAGETABLE_ENTRIES * sizeof(ept_entry_t));
++
+     unmap_domain_page(table);
+ 
+     /* Even failed we should install the newly allocated ept page. */
+@@ -875,7 +894,7 @@ out:
+          need_modify_vtd_table )
+     {
+         if ( iommu_hap_pt_share )
+-            rc = iommu_pte_flush(d, gfn, &ept_entry->epte, order, vtd_pte_present);
++            rc = iommu_flush_iotlb(d, gfn, vtd_pte_present, 1u << order);
+         else
+         {
+             if ( iommu_flags )
+--- xen/drivers/passthrough/vtd/iommu.c.orig
++++ xen/drivers/passthrough/vtd/iommu.c
+@@ -612,10 +612,8 @@ static int __must_check iommu_flush_all(
+     return rc;
+ }
+ 
+-static int __must_check iommu_flush_iotlb(struct domain *d,
+-                                          unsigned long gfn,
+-                                          bool_t dma_old_pte_present,
+-                                          unsigned int page_count)
++int iommu_flush_iotlb(struct domain *d, unsigned long gfn,
++                      bool dma_old_pte_present, unsigned int page_count)
+ {
+     struct domain_iommu *hd = dom_iommu(d);
+     struct acpi_drhd_unit *drhd;
+@@ -1880,53 +1878,6 @@ static int __must_check intel_iommu_unma
+     return dma_pte_clear_one(d, (paddr_t)gfn << PAGE_SHIFT_4K);
+ }
+ 
+-int iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
+-                    int order, int present)
+-{
+-    struct acpi_drhd_unit *drhd;
+-    struct iommu *iommu = NULL;
+-    struct domain_iommu *hd = dom_iommu(d);
+-    bool_t flush_dev_iotlb;
+-    int iommu_domid;
+-    int rc = 0;
+-
+-    iommu_sync_cache(pte, sizeof(struct dma_pte));
+-
+-    for_each_drhd_unit ( drhd )
+-    {
+-        iommu = drhd->iommu;
+-        if ( !test_bit(iommu->index, &hd->arch.iommu_bitmap) )
+-            continue;
+-
+-        flush_dev_iotlb = !!find_ats_dev_drhd(iommu);
+-        iommu_domid= domain_iommu_domid(d, iommu);
+-        if ( iommu_domid == -1 )
+-            continue;
+-
+-        rc = iommu_flush_iotlb_psi(iommu, iommu_domid,
+-                                   (paddr_t)gfn << PAGE_SHIFT_4K,
+-                                   order, !present, flush_dev_iotlb);
+-        if ( rc > 0 )
+-        {
+-            iommu_flush_write_buffer(iommu);
+-            rc = 0;
+-        }
+-    }
+-
+-    if ( unlikely(rc) )
+-    {
+-        if ( !d->is_shutting_down && printk_ratelimit() )
+-            printk(XENLOG_ERR VTDPREFIX
+-                   " d%d: IOMMU pages flush failed: %d\n",
+-                   d->domain_id, rc);
+-
+-        if ( !is_hardware_domain(d) )
+-            domain_crash(d);
+-    }
+-
+-    return rc;
+-}
+-
+ static int __init vtd_ept_page_compatible(struct iommu *iommu)
+ {
+     u64 ept_cap, vtd_cap = iommu->cap;
+--- xen/include/asm-x86/iommu.h.orig
++++ xen/include/asm-x86/iommu.h
+@@ -87,8 +87,9 @@ int iommu_setup_hpet_msi(struct msi_desc
+ 
+ /* While VT-d specific, this must get declared in a generic header. */
+ int adjust_vtd_irq_affinities(void);
+-int __must_check iommu_pte_flush(struct domain *d, u64 gfn, u64 *pte,
+-                                 int order, int present);
++int __must_check iommu_flush_iotlb(struct domain *d, unsigned long gfn,
++                                   bool dma_old_pte_present,
++                                   unsigned int page_count);
+ bool_t iommu_supports_eim(void);
+ int iommu_enable_x2apic_IR(void);
+ void iommu_disable_x2apic_IR(void);
diff --git a/sysutils/xenkernel411/patches/patch-XSA328 b/sysutils/xenkernel411/patches/patch-XSA328
new file mode 100644
index 00000000000..ae9a6ad5465
--- /dev/null
+++ b/sysutils/xenkernel411/patches/patch-XSA328
@@ -0,0 +1,213 @@
+$NetBSD: patch-XSA328,v 1.1.2.2 2020/08/28 15:37:49 bsiegert Exp $
+
+From: Jan Beulich <jbeulich@suse.com>
+Subject: x86/EPT: ept_set_middle_entry() related adjustments
+
+ept_split_super_page() wants to further modify the newly allocated
+table, so have ept_set_middle_entry() return the mapped pointer rather
+than tearing it down and then getting re-established right again.
+
+Similarly ept_next_level() wants to hand back a mapped pointer of
+the next level page, so re-use the one established by
+ept_set_middle_entry() in case that path was taken.
+
+Pull the setting of suppress_ve ahead of insertion into the higher level
+table, and don't have ept_split_super_page() set the field a 2nd time.
+
+This is part of XSA-328.
+
+Signed-off-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/arch/x86/mm/p2m-ept.c.orig
++++ xen/arch/x86/mm/p2m-ept.c
+@@ -228,8 +228,9 @@ static void ept_p2m_type_to_flags(struct
+ #define GUEST_TABLE_SUPER_PAGE  2
+ #define GUEST_TABLE_POD_PAGE    3
+ 
+-/* Fill in middle levels of ept table */
+-static int ept_set_middle_entry(struct p2m_domain *p2m, ept_entry_t *ept_entry)
++/* Fill in middle level of ept table; return pointer to mapped new table. */
++static ept_entry_t *ept_set_middle_entry(struct p2m_domain *p2m,
++                                         ept_entry_t *ept_entry)
+ {
+     mfn_t mfn;
+     ept_entry_t *table;
+@@ -237,7 +238,12 @@ static int ept_set_middle_entry(struct p
+ 
+     mfn = p2m_alloc_ptp(p2m, 0);
+     if ( mfn_eq(mfn, INVALID_MFN) )
+-        return 0;
++        return NULL;
++
++    table = map_domain_page(mfn);
++
++    for ( i = 0; i < EPT_PAGETABLE_ENTRIES; i++ )
++        table[i].suppress_ve = 1;
+ 
+     ept_entry->epte = 0;
+     ept_entry->mfn = mfn_x(mfn);
+@@ -249,14 +255,7 @@ static int ept_set_middle_entry(struct p
+ 
+     ept_entry->suppress_ve = 1;
+ 
+-    table = map_domain_page(mfn);
+-
+-    for ( i = 0; i < EPT_PAGETABLE_ENTRIES; i++ )
+-        table[i].suppress_ve = 1;
+-
+-    unmap_domain_page(table);
+-
+-    return 1;
++    return table;
+ }
+ 
+ /* free ept sub tree behind an entry */
+@@ -294,10 +293,10 @@ static bool_t ept_split_super_page(struc
+ 
+     ASSERT(is_epte_superpage(ept_entry));
+ 
+-    if ( !ept_set_middle_entry(p2m, &new_ept) )
++    table = ept_set_middle_entry(p2m, &new_ept);
++    if ( !table )
+         return 0;
+ 
+-    table = map_domain_page(_mfn(new_ept.mfn));
+     trunk = 1UL << ((level - 1) * EPT_TABLE_ORDER);
+ 
+     for ( i = 0; i < EPT_PAGETABLE_ENTRIES; i++ )
+@@ -308,7 +307,6 @@ static bool_t ept_split_super_page(struc
+         epte->sp = (level > 1);
+         epte->mfn += i * trunk;
+         epte->snp = (iommu_enabled && iommu_snoop);
+-        epte->suppress_ve = 1;
+ 
+         ept_p2m_type_to_flags(p2m, epte, epte->sa_p2mt, epte->access);
+ 
+@@ -347,8 +345,7 @@ static int ept_next_level(struct p2m_dom
+                           ept_entry_t **table, unsigned long *gfn_remainder,
+                           int next_level)
+ {
+-    unsigned long mfn;
+-    ept_entry_t *ept_entry, e;
++    ept_entry_t *ept_entry, *next = NULL, e;
+     u32 shift, index;
+ 
+     shift = next_level * EPT_TABLE_ORDER;
+@@ -373,19 +370,17 @@ static int ept_next_level(struct p2m_dom
+         if ( read_only )
+             return GUEST_TABLE_MAP_FAILED;
+ 
+-        if ( !ept_set_middle_entry(p2m, ept_entry) )
++        next = ept_set_middle_entry(p2m, ept_entry);
++        if ( !next )
+             return GUEST_TABLE_MAP_FAILED;
+-        else
+-            e = atomic_read_ept_entry(ept_entry); /* Refresh */
++        /* e is now stale and hence may not be used anymore below. */
+     }
+-
+     /* The only time sp would be set here is if we had hit a superpage */
+-    if ( is_epte_superpage(&e) )
++    else if ( is_epte_superpage(&e) )
+         return GUEST_TABLE_SUPER_PAGE;
+ 
+-    mfn = e.mfn;
+     unmap_domain_page(*table);
+-    *table = map_domain_page(_mfn(mfn));
++    *table = next ?: map_domain_page(_mfn(e.mfn));
+     *gfn_remainder &= (1UL << shift) - 1;
+     return GUEST_TABLE_NORMAL_PAGE;
+ }
+From: <security@xenproject.org>
+Subject: x86/ept: atomically modify entries in ept_next_level
+
+ept_next_level was passing a live PTE pointer to ept_set_middle_entry,
+which was then modified without taking into account that the PTE could
+be part of a live EPT table. This wasn't a security issue because the
+pages returned by p2m_alloc_ptp are zeroed, so adding such an entry
+before actually initializing it didn't allow a guest to access
+physical memory addresses it wasn't supposed to access.
+
+This is part of XSA-328.
+
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/arch/x86/mm/p2m-ept.c.orig
++++ xen/arch/x86/mm/p2m-ept.c
+@@ -348,6 +348,8 @@ static int ept_next_level(struct p2m_dom
+     ept_entry_t *ept_entry, *next = NULL, e;
+     u32 shift, index;
+ 
++    ASSERT(next_level);
++
+     shift = next_level * EPT_TABLE_ORDER;
+ 
+     index = *gfn_remainder >> shift;
+@@ -364,16 +366,20 @@ static int ept_next_level(struct p2m_dom
+ 
+     if ( !is_epte_present(&e) )
+     {
++        int rc;
++
+         if ( e.sa_p2mt == p2m_populate_on_demand )
+             return GUEST_TABLE_POD_PAGE;
+ 
+         if ( read_only )
+             return GUEST_TABLE_MAP_FAILED;
+ 
+-        next = ept_set_middle_entry(p2m, ept_entry);
++        next = ept_set_middle_entry(p2m, &e);
+         if ( !next )
+             return GUEST_TABLE_MAP_FAILED;
+-        /* e is now stale and hence may not be used anymore below. */
++
++        rc = atomic_write_ept_entry(ept_entry, e, next_level);
++        ASSERT(rc == 0);
+     }
+     /* The only time sp would be set here is if we had hit a superpage */
+     else if ( is_epte_superpage(&e) )
+
+this has to be applied after patch-XSA328
+
+From: <security@xenproject.org>
+Subject: x86/ept: flush cache when modifying PTEs and sharing page tables
+
+Modifications made to the page tables by EPT code need to be written
+to memory when the page tables are shared with the IOMMU, as Intel
+IOMMUs can be non-coherent and thus require changes to be written to
+memory in order to be visible to the IOMMU.
+
+In order to achieve this make sure data is written back to memory
+after writing an EPT entry when the recalc bit is not set in
+atomic_write_ept_entry. If such bit is set, the entry will be
+adjusted and atomic_write_ept_entry will be called a second time
+without the recalc bit set. Note that when splitting a super page the
+new tables resulting of the split should also be written back.
+
+Failure to do so can allow devices behind the IOMMU access to the
+stale super page, or cause coherency issues as changes made by the
+processor to the page tables are not visible to the IOMMU.
+
+This allows to remove the VT-d specific iommu_pte_flush helper, since
+the cache write back is now performed by atomic_write_ept_entry, and
+hence iommu_iotlb_flush can be used to flush the IOMMU TLB. The newly
+used method (iommu_iotlb_flush) can result in less flushes, since it
+might sometimes be called rightly with 0 flags, in which case it
+becomes a no-op.
+
+This is part of XSA-321.
+
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+--- xen/arch/x86/mm/p2m-ept.c.orig
++++ xen/arch/x86/mm/p2m-ept.c
+@@ -394,6 +394,9 @@
+         if ( !next )
+             return GUEST_TABLE_MAP_FAILED;
+ 
++        if ( iommu_hap_pt_share )
++            iommu_sync_cache(next, EPT_PAGETABLE_ENTRIES * sizeof(ept_entry_t));
++
+         rc = atomic_write_ept_entry(ept_entry, e, next_level);
+         ASSERT(rc == 0);
+     }