PSARC 2007/664 Paravirtualized Drivers for Fully Virtualized xVM Domains

6525093 xnb/xnf should use hypervisor based copy for xnb->xnf data path
6608917 members of struct xnf and xnb need unique names
6609324 deadlock trying to own the HAT migrate lock
6609805 still missing XPV_DISALLOW_MIGRATE/XPV_ALLOW_MIGRATE bracketing in hat_i86.c
6616384 xnb's grant ref unmapping is inefficient
6619947 Solaris should provide a PV network driver for xVM HVM environments
6632774 panic setting up xen console

--HG--
rename : usr/src/uts/i86xpv/os/gnttab.c => usr/src/uts/common/xen/os/gnttab.c
rename : usr/src/uts/i86xpv/os/hypercall.c => usr/src/uts/common/xen/os/hypercall.c
rename : usr/src/uts/i86xpv/sys/gnttab.h => usr/src/uts/common/xen/sys/gnttab.h
rename : usr/src/uts/i86xpv/ml/hypersubr.s => usr/src/uts/intel/ia32/ml/hypersubr.s
rename : usr/src/uts/i86xpv/sys/hypervisor.h => usr/src/uts/intel/sys/hypervisor.h
rename : usr/src/uts/i86xpv/sys/xen_errno.h => usr/src/uts/intel/sys/xen_errno.h

1 files changed, 561 insertions, 0 deletions

diff --git a/usr/src/uts/common/xen/os/gnttab.c b/usr/src/uts/common/xen/os/gnttab.c
new file mode 100644
index 0000000000..238c45768e
--- /dev/null
+++ b/usr/src/uts/common/xen/os/gnttab.c
@@ -0,0 +1,561 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*
+ * gnttab.c
+ *
+ * Granting foreign access to our memory reservation.
+ *
+ * Copyright (c) 2005, Christopher Clark
+ * Copyright (c) 2004-2005, K A Fraser
+ *
+ * This file may be distributed separately from the Linux kernel, or
+ * incorporated into other software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/archsystm.h>
+#ifdef XPV_HVM_DRIVER
+#include <sys/xpv_support.h>
+#include <sys/mman.h>
+#include <vm/hat.h>
+#endif
+#include <sys/hypervisor.h>
+#include <sys/gnttab.h>
+#include <sys/sysmacros.h>
+#include <sys/machsystm.h>
+#include <sys/systm.h>
+#include <sys/mutex.h>
+#include <sys/atomic.h>
+#include <sys/spl.h>
+#include <sys/condvar.h>
+#include <sys/cpuvar.h>
+#include <sys/taskq.h>
+#include <sys/panic.h>
+#include <sys/cmn_err.h>
+#include <sys/promif.h>
+#include <sys/cpu.h>
+#include <sys/vmem.h>
+#include <vm/hat_i86.h>
+#include <sys/bootconf.h>
+#include <sys/bootsvcs.h>
+#ifndef XPV_HVM_DRIVER
+#include <sys/bootinfo.h>
+#include <sys/multiboot.h>
+#include <vm/kboot_mmu.h>
+#endif
+#include <sys/bootvfs.h>
+#include <sys/bootprops.h>
+#include <vm/seg_kmem.h>
+
+#define	cmpxchg(t, c, n) atomic_cas_16((t), (c), (n))
+
+/* External tools reserve first few grant table entries. */
+#define	NR_RESERVED_ENTRIES 8
+
+#define	NR_GRANT_ENTRIES (NR_GRANT_FRAMES * \
+	    MMU_PAGESIZE / sizeof (grant_entry_t))
+#define	GNTTAB_LIST_END (NR_GRANT_ENTRIES + 1)
+#define	VALID_GRANT_REF(r) ((r) < NR_GRANT_ENTRIES)
+
+static grant_ref_t gnttab_list[NR_GRANT_ENTRIES];
+static int gnttab_free_count;
+static grant_ref_t gnttab_free_head;
+static kmutex_t gnttab_list_lock;
+
+static grant_entry_t *shared;
+#define	GT_PGADDR(i) ((uintptr_t)shared + ((i) << PAGESHIFT))
+
+static struct gnttab_free_callback *gnttab_free_callback_list = NULL;
+
+static int
+get_free_entries(int count)
+{
+	int ref;
+	grant_ref_t head;
+
+	mutex_enter(&gnttab_list_lock);
+	if (gnttab_free_count < count) {
+		mutex_exit(&gnttab_list_lock);
+		return (-1);
+	}
+	ref = head = gnttab_free_head;
+	gnttab_free_count -= count;
+	while (count-- > 1)
+		head = gnttab_list[head];
+	gnttab_free_head = gnttab_list[head];
+	gnttab_list[head] = GNTTAB_LIST_END;
+	mutex_exit(&gnttab_list_lock);
+	return (ref);
+}
+
+#define	get_free_entry() get_free_entries(1)
+
+static void
+do_free_callbacks(void)
+{
+	struct gnttab_free_callback *callback, *next;
+
+	callback = gnttab_free_callback_list;
+	gnttab_free_callback_list = NULL;
+
+	while (callback != NULL) {
+		next = callback->next;
+		if (gnttab_free_count >= callback->count) {
+			callback->next = NULL;
+			callback->fn(callback->arg);
+		} else {
+			callback->next = gnttab_free_callback_list;
+			gnttab_free_callback_list = callback;
+		}
+		callback = next;
+	}
+}
+
+static void
+check_free_callbacks(void)
+{
+	if (gnttab_free_callback_list)
+		do_free_callbacks();
+}
+
+static void
+put_free_entry(grant_ref_t ref)
+{
+	ASSERT(VALID_GRANT_REF(ref));
+
+	mutex_enter(&gnttab_list_lock);
+	gnttab_list[ref] = gnttab_free_head;
+	gnttab_free_head = ref;
+	gnttab_free_count++;
+	check_free_callbacks();
+	mutex_exit(&gnttab_list_lock);
+}
+
+/*
+ * Public grant-issuing interface functions
+ */
+
+int
+gnttab_grant_foreign_access(domid_t domid, gnttab_frame_t frame, int readonly)
+{
+	int ref;
+
+	if ((ref = get_free_entry()) == -1)
+		return (-1);
+
+	ASSERT(VALID_GRANT_REF(ref));
+
+	shared[ref].frame = frame;
+	shared[ref].domid = domid;
+	membar_producer();
+	shared[ref].flags = GTF_permit_access | (readonly ? GTF_readonly : 0);
+
+	return (ref);
+}
+
+void
+gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
+				gnttab_frame_t frame, int readonly)
+{
+	ASSERT(VALID_GRANT_REF(ref));
+
+	shared[ref].frame = frame;
+	shared[ref].domid = domid;
+	membar_producer();
+	shared[ref].flags = GTF_permit_access | (readonly ? GTF_readonly : 0);
+}
+
+
+int
+gnttab_query_foreign_access(grant_ref_t ref)
+{
+	uint16_t nflags;
+
+	ASSERT(VALID_GRANT_REF(ref));
+
+	nflags = shared[ref].flags;
+
+	return (nflags & (GTF_reading|GTF_writing));
+}
+
+/* ARGSUSED */
+int
+gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly)
+{
+	uint16_t flags, nflags;
+
+	ASSERT(VALID_GRANT_REF(ref));
+
+	nflags = shared[ref].flags;
+	do {
+		if ((flags = nflags) & (GTF_reading|GTF_writing)) {
+			cmn_err(CE_WARN, "g.e. still in use!");
+			return (0);
+		}
+	} while ((nflags = cmpxchg(&shared[ref].flags, flags, 0)) != flags);
+
+	return (1);
+}
+
+void
+gnttab_end_foreign_access(grant_ref_t ref, int readonly, gnttab_frame_t page)
+{
+	ASSERT(VALID_GRANT_REF(ref));
+
+	if (gnttab_end_foreign_access_ref(ref, readonly)) {
+		put_free_entry(ref);
+		/*
+		 * XXPV - we don't support freeing a page here
+		 */
+		if (page != 0) {
+			cmn_err(CE_WARN,
+	"gnttab_end_foreign_access_ref: using unsupported free_page interface");
+			/* free_page(page); */
+		}
+	} else {
+		/*
+		 * XXX This needs to be fixed so that the ref and page are
+		 * placed on a list to be freed up later.
+		 */
+		cmn_err(CE_WARN, "leaking g.e. and page still in use!");
+	}
+}
+
+int
+gnttab_grant_foreign_transfer(domid_t domid)
+{
+	int ref;
+
+	if ((ref = get_free_entry()) == -1)
+		return (-1);
+
+	ASSERT(VALID_GRANT_REF(ref));
+
+	shared[ref].frame = 0;
+	shared[ref].domid = domid;
+	membar_producer();
+	shared[ref].flags = GTF_accept_transfer;
+
+	return (ref);
+}
+
+void
+gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid)
+{
+	ASSERT(VALID_GRANT_REF(ref));
+
+	shared[ref].frame = 0;
+	shared[ref].domid = domid;
+	membar_producer();
+	shared[ref].flags = GTF_accept_transfer;
+}
+
+gnttab_frame_t
+gnttab_end_foreign_transfer_ref(grant_ref_t ref)
+{
+	gnttab_frame_t frame;
+	uint16_t flags;
+
+	ASSERT(VALID_GRANT_REF(ref));
+
+	/*
+	 * If a transfer is not even yet started, try to reclaim the grant
+	 * reference and return failure (== 0).
+	 */
+	while (!((flags = shared[ref].flags) & GTF_transfer_committed)) {
+		if (cmpxchg(&shared[ref].flags, flags, 0) == flags)
+			return (0);
+		(void) HYPERVISOR_yield();
+	}
+
+	/* If a transfer is in progress then wait until it is completed. */
+	while (!(flags & GTF_transfer_completed)) {
+		flags = shared[ref].flags;
+		(void) HYPERVISOR_yield();
+	}
+
+	/* Read the frame number /after/ reading completion status. */
+	membar_consumer();
+	frame = shared[ref].frame;
+	ASSERT(frame != 0);
+
+	return (frame);
+}
+
+gnttab_frame_t
+gnttab_end_foreign_transfer(grant_ref_t ref)
+{
+	gnttab_frame_t frame;
+
+	ASSERT(VALID_GRANT_REF(ref));
+
+	frame = gnttab_end_foreign_transfer_ref(ref);
+	put_free_entry(ref);
+	return (frame);
+}
+
+void
+gnttab_free_grant_reference(grant_ref_t ref)
+{
+	ASSERT(VALID_GRANT_REF(ref));
+
+	put_free_entry(ref);
+}
+
+void
+gnttab_free_grant_references(grant_ref_t head)
+{
+	grant_ref_t ref;
+	int count = 1;
+
+	if (head == GNTTAB_LIST_END)
+		return;
+	mutex_enter(&gnttab_list_lock);
+	ref = head;
+	while (gnttab_list[ref] != GNTTAB_LIST_END) {
+		ref = gnttab_list[ref];
+		count++;
+	}
+	gnttab_list[ref] = gnttab_free_head;
+	gnttab_free_head = head;
+	gnttab_free_count += count;
+	check_free_callbacks();
+	mutex_exit(&gnttab_list_lock);
+}
+
+int
+gnttab_alloc_grant_references(uint16_t count, grant_ref_t *head)
+{
+	int h = get_free_entries(count);
+
+	if (h == -1)
+		return (-1);
+
+	*head = h;
+
+	return (0);
+}
+
+int
+gnttab_claim_grant_reference(grant_ref_t *private_head)
+{
+	grant_ref_t g = *private_head;
+
+	if (g == GNTTAB_LIST_END)
+		return (-1);
+	*private_head = gnttab_list[g];
+	return (g);
+}
+
+void
+gnttab_release_grant_reference(grant_ref_t *private_head, grant_ref_t release)
+{
+	ASSERT(VALID_GRANT_REF(release));
+
+	gnttab_list[release] = *private_head;
+	*private_head = release;
+}
+
+void
+gnttab_request_free_callback(struct gnttab_free_callback *callback,
+	void (*fn)(void *), void *arg, uint16_t count)
+{
+	mutex_enter(&gnttab_list_lock);
+	if (callback->next)
+		goto out;
+	callback->fn = fn;
+	callback->arg = arg;
+	callback->count = count;
+	callback->next = gnttab_free_callback_list;
+	gnttab_free_callback_list = callback;
+	check_free_callbacks();
+out:
+	mutex_exit(&gnttab_list_lock);
+}
+
+#ifdef XPV_HVM_DRIVER
+
+static void
+gnttab_map(void)
+{
+	struct xen_add_to_physmap xatp;
+	caddr_t va;
+	pfn_t pfn;
+	int i;
+
+	va = (caddr_t)shared;
+	for (i = 0; i < NR_GRANT_FRAMES; i++) {
+		pfn = hat_getpfnum(kas.a_hat, va);
+
+		xatp.domid = DOMID_SELF;
+		xatp.idx = i;
+		xatp.space = XENMAPSPACE_grant_table;
+		xatp.gpfn = pfn;
+		hat_unload(kas.a_hat, va, MMU_PAGESIZE, HAT_UNLOAD);
+		if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp) != 0)
+			panic("Couldn't map grant table");
+
+		hat_devload(kas.a_hat, va, MMU_PAGESIZE, pfn,
+		    PROT_READ | PROT_WRITE,
+		    HAT_LOAD | HAT_LOAD_LOCK | HAT_LOAD_NOCONSIST);
+
+		va += MMU_PAGESIZE;
+	}
+}
+
+void
+gnttab_init(void)
+{
+	int i;
+
+	shared = (grant_entry_t *)xen_alloc_pages(NR_GRANT_FRAMES);
+
+	gnttab_map();
+
+	for (i = NR_RESERVED_ENTRIES; i < NR_GRANT_ENTRIES; i++)
+		gnttab_list[i] = i + 1;
+	gnttab_free_count = NR_GRANT_ENTRIES - NR_RESERVED_ENTRIES;
+	gnttab_free_head  = NR_RESERVED_ENTRIES;
+
+	mutex_init(&gnttab_list_lock, NULL, MUTEX_DEFAULT, NULL);
+}
+
+void
+gnttab_resume(void)
+{
+	gnttab_map();
+}
+
+#else /* XPV_HVM_DRIVER */
+
+void
+gnttab_init(void)
+{
+	gnttab_setup_table_t set;
+	gnttab_frame_t frames[NR_GRANT_FRAMES];
+	int i;
+
+	set.dom = DOMID_SELF;
+	set.nr_frames = NR_GRANT_FRAMES;
+	/*LINTED: constant in conditional context*/
+	set_xen_guest_handle(set.frame_list, frames);
+
+	/*
+	 * Take 4 pages of grant table space from the hypervisor and map it
+	 */
+	if ((HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &set, 1) != 0) ||
+	    (set.status != 0)) {
+		cmn_err(CE_PANIC, "Grant Table setup failed");
+	}
+
+	shared = vmem_xalloc(heap_arena, NR_GRANT_FRAMES * MMU_PAGESIZE,
+	    MMU_PAGESIZE, 0, 0, 0, 0, VM_SLEEP);
+
+	for (i = 0; i < NR_GRANT_FRAMES; i++)
+		kbm_map_ma(FRAME_TO_MA(frames[i]), GT_PGADDR(i), 0);
+
+	for (i = NR_RESERVED_ENTRIES; i < NR_GRANT_ENTRIES; i++)
+		gnttab_list[i] = i + 1;
+	gnttab_free_count = NR_GRANT_ENTRIES - NR_RESERVED_ENTRIES;
+	gnttab_free_head  = NR_RESERVED_ENTRIES;
+
+	mutex_init(&gnttab_list_lock, NULL, MUTEX_DEFAULT, NULL);
+}
+
+void
+gnttab_resume(void)
+{
+	gnttab_setup_table_t set;
+	gnttab_frame_t frames[NR_GRANT_FRAMES];
+	int i;
+
+	set.dom = DOMID_SELF;
+	set.nr_frames = NR_GRANT_FRAMES;
+	/*LINTED: constant in conditional context*/
+	set_xen_guest_handle(set.frame_list, frames);
+
+	/*
+	 * Take NR_GRANT_FRAMES pages of grant table space from the
+	 * hypervisor and map it
+	 */
+	if ((HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &set, 1) != 0) ||
+	    (set.status != 0)) {
+		cmn_err(CE_PANIC, "Grant Table setup failed");
+	}
+
+	for (i = 0; i < NR_GRANT_FRAMES; i++) {
+		(void) HYPERVISOR_update_va_mapping(GT_PGADDR(i),
+		    FRAME_TO_MA(frames[i]) | PT_VALID | PT_WRITABLE,
+		    UVMF_INVLPG | UVMF_ALL);
+	}
+}
+
+#endif /* XPV_HVM_DRIVER */
+
+void
+gnttab_suspend(void)
+{
+	int i;
+
+	/*
+	 * clear grant table mappings before suspending
+	 */
+	for (i = 0; i < NR_GRANT_FRAMES; i++) {
+		(void) HYPERVISOR_update_va_mapping(GT_PGADDR(i),
+		    0, UVMF_INVLPG);
+	}
+}
+
+/*
+ * Local variables:
+ *  c-file-style: "solaris"
+ *  indent-tabs-mode: t
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ *  tab-width: 8
+ * End:
+ */