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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Clean up the interface for sharing xen-heap pages with guests.
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID a4dc14edd56b2b59fa3f7797b048ce6ee8efc9e9
# Parent 4af3f8bd7e0c67977df60409b13c785c6e451e91
Clean up the interface for sharing xen-heap pages with guests.
Map trace buffer pages as DOMID_XEN pages.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r 4af3f8bd7e0c -r a4dc14edd56b tools/xenmon/xenbaked.c
--- a/tools/xenmon/xenbaked.c Wed Mar 8 23:04:43 2006
+++ b/tools/xenmon/xenbaked.c Wed Mar 8 23:45:40 2006
@@ -299,7 +299,7 @@
exit(EXIT_FAILURE);
}
- tbufs_mapped = xc_map_foreign_range(xc_handle, 0 /* Dom 0 ID */,
+ tbufs_mapped = xc_map_foreign_range(xc_handle, DOMID_XEN,
size * num, PROT_READ | PROT_WRITE,
tbufs_mfn);
diff -r 4af3f8bd7e0c -r a4dc14edd56b tools/xentrace/xentrace.c
--- a/tools/xentrace/xentrace.c Wed Mar 8 23:04:43 2006
+++ b/tools/xentrace/xentrace.c Wed Mar 8 23:45:40 2006
@@ -144,7 +144,7 @@
exit(EXIT_FAILURE);
}
- tbufs_mapped = xc_map_foreign_range(xc_handle, 0 /* Dom 0 ID */,
+ tbufs_mapped = xc_map_foreign_range(xc_handle, DOMID_XEN,
size * num, PROT_READ | PROT_WRITE,
tbufs_mfn);
diff -r 4af3f8bd7e0c -r a4dc14edd56b xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Wed Mar 8 23:04:43 2006
+++ b/xen/arch/x86/domain.c Wed Mar 8 23:45:40 2006
@@ -312,7 +312,8 @@
goto fail_nomem;
memset(d->shared_info, 0, PAGE_SIZE);
- SHARE_PFN_WITH_DOMAIN(virt_to_page(d->shared_info), d);
+ share_xen_page_with_guest(
+ virt_to_page(d->shared_info), d, XENSHARE_writable);
}
return 0;
diff -r 4af3f8bd7e0c -r a4dc14edd56b xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Wed Mar 8 23:04:43 2006
+++ b/xen/arch/x86/mm.c Wed Mar 8 23:45:40 2006
@@ -176,10 +176,9 @@
void arch_init_memory(void)
{
- extern void subarch_init_memory(struct domain *);
+ extern void subarch_init_memory(void);
unsigned long i, pfn, rstart_pfn, rend_pfn;
- struct page_info *page;
memset(percpu_info, 0, sizeof(percpu_info));
@@ -189,6 +188,7 @@
* their domain field set to dom_xen.
*/
dom_xen = alloc_domain();
+ spin_lock_init(&dom_xen->page_alloc_lock);
atomic_set(&dom_xen->refcnt, 1);
dom_xen->domain_id = DOMID_XEN;
@@ -198,17 +198,13 @@
* array. Mappings occur at the priv of the caller.
*/
dom_io = alloc_domain();
+ spin_lock_init(&dom_io->page_alloc_lock);
atomic_set(&dom_io->refcnt, 1);
dom_io->domain_id = DOMID_IO;
/* First 1MB of RAM is historically marked as I/O. */
for ( i = 0; i < 0x100; i++ )
- {
- page = mfn_to_page(i);
- page->count_info = PGC_allocated | 1;
- page->u.inuse.type_info = PGT_writable_page | PGT_validated | 1;
- page_set_owner(page, dom_io);
- }
+ share_xen_page_with_guest(mfn_to_page(i), dom_io, XENSHARE_writable);
/* Any areas not specified as RAM by the e820 map are considered I/O. */
for ( i = 0, pfn = 0; i < e820.nr_map; i++ )
@@ -221,17 +217,45 @@
for ( ; pfn < rstart_pfn; pfn++ )
{
BUG_ON(!mfn_valid(pfn));
- page = mfn_to_page(pfn);
- page->count_info = PGC_allocated | 1;
- page->u.inuse.type_info = PGT_writable_page | PGT_validated | 1;
- page_set_owner(page, dom_io);
+ share_xen_page_with_guest(
+ mfn_to_page(pfn), dom_io, XENSHARE_writable);
}
/* Skip the RAM region. */
pfn = rend_pfn;
}
BUG_ON(pfn != max_page);
- subarch_init_memory(dom_xen);
+ subarch_init_memory();
+}
+
+void share_xen_page_with_guest(
+ struct page_info *page, struct domain *d, int readonly)
+{
+ if ( page_get_owner(page) == d )
+ return;
+
+ spin_lock(&d->page_alloc_lock);
+
+ /* The incremented type count pins as writable or read-only. */
+ page->u.inuse.type_info = (readonly ? PGT_none : PGT_writable_page);
+ page->u.inuse.type_info |= PGT_validated | 1;
+
+ page_set_owner(page, d);
+ wmb(); /* install valid domain ptr before updating refcnt. */
+ ASSERT(page->count_info == 0);
+ page->count_info |= PGC_allocated | 1;
+
+ if ( unlikely(d->xenheap_pages++ == 0) )
+ get_knownalive_domain(d);
+ list_add_tail(&page->list, &d->xenpage_list);
+
+ spin_unlock(&d->page_alloc_lock);
+}
+
+void share_xen_page_with_privileged_guests(
+ struct page_info *page, int readonly)
+{
+ share_xen_page_with_guest(page, dom_xen, readonly);
}
void write_ptbase(struct vcpu *v)
diff -r 4af3f8bd7e0c -r a4dc14edd56b xen/arch/x86/x86_32/mm.c
--- a/xen/arch/x86/x86_32/mm.c Wed Mar 8 23:04:43 2006
+++ b/xen/arch/x86/x86_32/mm.c Wed Mar 8 23:45:40 2006
@@ -144,7 +144,7 @@
flush_tlb_all_pge();
}
-void subarch_init_memory(struct domain *dom_xen)
+void subarch_init_memory(void)
{
unsigned long m2p_start_mfn;
unsigned int i, j;
@@ -175,10 +175,7 @@
for ( j = 0; j < L2_PAGETABLE_ENTRIES; j++ )
{
struct page_info *page = mfn_to_page(m2p_start_mfn + j);
- page->count_info = PGC_allocated | 1;
- /* Ensure it's only mapped read-only by domains. */
- page->u.inuse.type_info = PGT_gdt_page | 1;
- page_set_owner(page, dom_xen);
+ share_xen_page_with_privileged_guests(page, XENSHARE_readonly);
}
}
diff -r 4af3f8bd7e0c -r a4dc14edd56b xen/arch/x86/x86_64/mm.c
--- a/xen/arch/x86/x86_64/mm.c Wed Mar 8 23:04:43 2006
+++ b/xen/arch/x86/x86_64/mm.c Wed Mar 8 23:45:40 2006
@@ -134,7 +134,7 @@
flush_tlb_all_pge();
}
-void subarch_init_memory(struct domain *dom_xen)
+void subarch_init_memory(void)
{
unsigned long i, v, m2p_start_mfn;
l3_pgentry_t l3e;
@@ -174,11 +174,7 @@
for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
{
struct page_info *page = mfn_to_page(m2p_start_mfn + i);
- page->count_info = PGC_allocated | 1;
- /* gdt to make sure it's only mapped read-only by non-privileged
- domains. */
- page->u.inuse.type_info = PGT_gdt_page | 1;
- page_set_owner(page, dom_xen);
+ share_xen_page_with_privileged_guests(page, XENSHARE_readonly);
}
}
}
diff -r 4af3f8bd7e0c -r a4dc14edd56b xen/common/trace.c
--- a/xen/common/trace.c Wed Mar 8 23:04:43 2006
+++ b/xen/common/trace.c Wed Mar 8 23:45:40 2006
@@ -83,8 +83,9 @@
/* Share pages so that xentrace can map them. */
for ( i = 0; i < nr_pages; i++ )
- SHARE_PFN_WITH_DOMAIN(virt_to_page(rawbuf + i * PAGE_SIZE), dom0);
-
+ share_xen_page_with_privileged_guests(
+ virt_to_page(rawbuf) + i, XENSHARE_writable);
+
for_each_online_cpu ( i )
{
buf = t_bufs[i] = (struct t_buf *)&rawbuf[i*opt_tbuf_size*PAGE_SIZE];
diff -r 4af3f8bd7e0c -r a4dc14edd56b xen/include/asm-ia64/mm.h
--- a/xen/include/asm-ia64/mm.h Wed Mar 8 23:04:43 2006
+++ b/xen/include/asm-ia64/mm.h Wed Mar 8 23:45:40 2006
@@ -118,7 +118,8 @@
#define page_set_owner(_p, _d) ((_p)->u.inuse._domain = pickle_domptr(_d))
/* Dummy now */
-#define SHARE_PFN_WITH_DOMAIN(_pfn, _dom) do { } while (0)
+#define share_xen_page_with_guest(p, d, r) do { } while (0)
+#define share_xen_page_with_privileged_guests(p, r) do { } while (0)
extern struct page_info *frame_table;
extern unsigned long frame_table_size;
diff -r 4af3f8bd7e0c -r a4dc14edd56b xen/include/asm-x86/grant_table.h
--- a/xen/include/asm-x86/grant_table.h Wed Mar 8 23:04:43 2006
+++ b/xen/include/asm-x86/grant_table.h Wed Mar 8 23:45:40 2006
@@ -23,8 +23,9 @@
#define gnttab_create_shared_page(d, t, i) \
do { \
- SHARE_PFN_WITH_DOMAIN( \
- virt_to_page((char *)(t)->shared + ((i) * PAGE_SIZE)), (d)); \
+ share_xen_page_with_guest( \
+ virt_to_page((char *)(t)->shared + ((i) * PAGE_SIZE)), \
+ (d), XENSHARE_writable); \
set_gpfn_from_mfn( \
(virt_to_maddr((t)->shared) >> PAGE_SHIFT) + (i), \
INVALID_M2P_ENTRY); \
diff -r 4af3f8bd7e0c -r a4dc14edd56b xen/include/asm-x86/mm.h
--- a/xen/include/asm-x86/mm.h Wed Mar 8 23:04:43 2006
+++ b/xen/include/asm-x86/mm.h Wed Mar 8 23:45:40 2006
@@ -138,21 +138,12 @@
#define page_get_owner(_p) (unpickle_domptr((_p)->u.inuse._domain))
#define page_set_owner(_p,_d) ((_p)->u.inuse._domain = pickle_domptr(_d))
-#define SHARE_PFN_WITH_DOMAIN(_pfn, _dom) \
- do { \
- page_set_owner((_pfn), (_dom)); \
- /* The incremented type count is intended to pin to 'writable'. */ \
- (_pfn)->u.inuse.type_info = PGT_writable_page | PGT_validated | 1; \
- wmb(); /* install valid domain ptr before updating refcnt. */ \
- spin_lock(&(_dom)->page_alloc_lock); \
- /* _dom holds an allocation reference */ \
- ASSERT((_pfn)->count_info == 0); \
- (_pfn)->count_info |= PGC_allocated | 1; \
- if ( unlikely((_dom)->xenheap_pages++ == 0) ) \
- get_knownalive_domain(_dom); \
- list_add_tail(&(_pfn)->list, &(_dom)->xenpage_list); \
- spin_unlock(&(_dom)->page_alloc_lock); \
- } while ( 0 )
+#define XENSHARE_writable 0
+#define XENSHARE_readonly 1
+extern void share_xen_page_with_guest(
+ struct page_info *page, struct domain *d, int readonly);
+extern void share_xen_page_with_privileged_guests(
+ struct page_info *page, int readonly);
extern struct page_info *frame_table;
extern unsigned long max_page;
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