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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Replace memory_op subcommands reserved_phys_area and map_shared_info
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID e408a374840c44a2f3d0e649cd1339aaf60ed5ea
# Parent c5286130a96e684545f5ce3a75255eb6b97d3f8e
Replace memory_op subcommands reserved_phys_area and map_shared_info
with new subcommand add_to_physmap.
This changes the domain0 tools interface, but only when building
shadow-translate-mode guests.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r c5286130a96e -r e408a374840c tools/libxc/xc_linux_build.c
--- a/tools/libxc/xc_linux_build.c Fri Mar 10 13:27:24 2006
+++ b/tools/libxc/xc_linux_build.c Fri Mar 10 15:00:36 2006
@@ -863,8 +863,7 @@
if ( shadow_mode_enabled )
{
- struct xen_reserved_phys_area xrpa;
- struct xen_map_shared_info xmsi;
+ struct xen_add_to_physmap xatp;
/* Enable shadow translate mode */
if ( xc_shadow_control(xc_handle, dom,
@@ -875,25 +874,35 @@
goto error_out;
}
- /* Find the shared info frame. It's guaranteed to be at the
- start of the PFN hole. */
- xrpa.domid = dom;
- xrpa.idx = 0;
- rc = xc_memory_op(xc_handle, XENMEM_reserved_phys_area, &xrpa);
- if ( rc != 0 )
- {
- PERROR("Cannot find shared info pfn");
- goto error_out;
- }
-
guest_shared_info_mfn = (vsharedinfo_start-dsi.v_start) >> PAGE_SHIFT;
- xmsi.domid = dom;
- xmsi.pfn = guest_shared_info_mfn;
- rc = xc_memory_op(xc_handle, XENMEM_map_shared_info, &xmsi);
+
+ /* Map shared info frame into guest physmap. */
+ xatp.domid = dom;
+ xatp.space = XENMAPSPACE_shared_info;
+ xatp.idx = 0;
+ xatp.gpfn = guest_shared_info_mfn;
+ rc = xc_memory_op(xc_handle, XENMEM_add_to_physmap, &xatp);
if ( rc != 0 )
{
PERROR("Cannot map shared info pfn");
goto error_out;
+ }
+
+ /* Map grant table frames into guest physmap. */
+ for ( i = 0; ; i++ )
+ {
+ xatp.domid = dom;
+ xatp.space = XENMAPSPACE_grant_table;
+ xatp.idx = i;
+ xatp.gpfn = nr_pages + i;
+ rc = xc_memory_op(xc_handle, XENMEM_add_to_physmap, &xatp);
+ if ( rc != 0 )
+ {
+ if ( errno == EINVAL )
+ break; /* done all grant tables */
+ PERROR("Cannot map grant table pfn");
+ goto error_out;
+ }
}
}
else
diff -r c5286130a96e -r e408a374840c tools/libxc/xc_private.c
--- a/tools/libxc/xc_private.c Fri Mar 10 13:27:24 2006
+++ b/tools/libxc/xc_private.c Fri Mar 10 15:00:36 2006
@@ -231,8 +231,8 @@
goto out1;
}
break;
- case XENMEM_reserved_phys_area:
- if ( mlock(arg, sizeof(struct xen_reserved_phys_area)) )
+ case XENMEM_add_to_physmap:
+ if ( mlock(arg, sizeof(struct xen_add_to_physmap)) )
{
PERROR("Could not mlock");
goto out1;
@@ -277,8 +277,8 @@
safe_munlock(xmml->extent_start,
xmml->max_extents * sizeof(unsigned long));
break;
- case XENMEM_reserved_phys_area:
- safe_munlock(arg, sizeof(struct xen_reserved_phys_area));
+ case XENMEM_add_to_physmap:
+ safe_munlock(arg, sizeof(struct xen_add_to_physmap));
break;
case XENMEM_translate_gpfn_list:
safe_munlock(trans->mfn_list, trans->nr_gpfns * sizeof(long));
diff -r c5286130a96e -r e408a374840c xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Fri Mar 10 13:27:24 2006
+++ b/xen/arch/x86/mm.c Fri Mar 10 15:00:36 2006
@@ -234,6 +234,8 @@
if ( page_get_owner(page) == d )
return;
+ set_gpfn_from_mfn(page_to_mfn(page), INVALID_M2P_ENTRY);
+
spin_lock(&d->page_alloc_lock);
/* The incremented type count pins as writable or read-only. */
@@ -2817,81 +2819,54 @@
long arch_memory_op(int op, GUEST_HANDLE(void) arg)
{
- unsigned long pfn;
- struct domain *d;
- unsigned int i;
-
switch ( op )
{
- case XENMEM_reserved_phys_area: {
- struct xen_reserved_phys_area xrpa;
-
- if ( copy_from_guest(&xrpa, arg, 1) )
+ case XENMEM_add_to_physmap:
+ {
+ struct xen_add_to_physmap xatp;
+ unsigned long mfn = 0, gpfn;
+ struct domain *d;
+
+ if ( copy_from_guest(&xatp, arg, 1) )
return -EFAULT;
- /* No guest has more than one reserved area. */
- if ( xrpa.idx != 0 )
+ if ( (d = find_domain_by_id(xatp.domid)) == NULL )
return -ESRCH;
- if ( (d = find_domain_by_id(xrpa.domid)) == NULL )
- return -ESRCH;
-
- /* Only initialised translated guests have a reserved area. */
- if ( !shadow_mode_translate(d) || (d->max_pages == 0) )
- {
- put_domain(d);
- return -ESRCH;
- }
-
- LOCK_BIGLOCK(d);
- if ( d->arch.first_reserved_pfn == 0 )
- {
- d->arch.first_reserved_pfn = pfn = d->max_pages;
- for ( i = 0; i < NR_GRANT_FRAMES; i++ )
- guest_physmap_add_page(
- d, pfn + i, gnttab_shared_mfn(d, d->grant_table, i));
- }
- UNLOCK_BIGLOCK(d);
-
- xrpa.first_gpfn = d->arch.first_reserved_pfn;
- xrpa.nr_gpfns = NR_GRANT_FRAMES;
-
- put_domain(d);
-
- if ( copy_to_guest(arg, &xrpa, 1) )
- return -EFAULT;
-
- break;
- }
-
- case XENMEM_map_shared_info: {
- struct xen_map_shared_info xmsi;
-
- if ( copy_from_guest(&xmsi, arg, 1) )
- return -EFAULT;
-
- if ( (d = find_domain_by_id(xmsi.domid)) == NULL )
- return -ESRCH;
-
- /* Only initialised translated guests can set the shared_info
- * mapping. */
- if ( !shadow_mode_translate(d) || (d->max_pages == 0) )
- {
- put_domain(d);
- return -ESRCH;
- }
-
- if ( xmsi.pfn > d->max_pages ) {
+ switch ( xatp.space )
+ {
+ case XENMAPSPACE_shared_info:
+ if ( xatp.idx == 0 )
+ mfn = virt_to_mfn(d->shared_info);
+ break;
+ case XENMAPSPACE_grant_table:
+ if ( xatp.idx < NR_GRANT_FRAMES )
+ mfn = virt_to_mfn(d->grant_table->shared) + xatp.idx;
+ break;
+ default:
+ break;
+ }
+
+ if ( !shadow_mode_translate(d) || (mfn == 0) )
+ {
put_domain(d);
return -EINVAL;
}
LOCK_BIGLOCK(d);
+
/* Remove previously mapped page if it was present. */
- if ( mfn_valid(gmfn_to_mfn(d, xmsi.pfn)) )
- guest_remove_page(d, xmsi.pfn);
- guest_physmap_add_page(d, xmsi.pfn,
- virt_to_maddr(d->shared_info) >> PAGE_SHIFT);
+ if ( mfn_valid(gmfn_to_mfn(d, xatp.gpfn)) )
+ guest_remove_page(d, xatp.gpfn);
+
+ /* Unmap from old location, if any. */
+ gpfn = get_gpfn_from_mfn(mfn);
+ if ( gpfn != INVALID_M2P_ENTRY )
+ guest_physmap_remove_page(d, gpfn, mfn);
+
+ /* Map at new location. */
+ guest_physmap_add_page(d, xatp.gpfn, mfn);
+
UNLOCK_BIGLOCK(d);
put_domain(d);
diff -r c5286130a96e -r e408a374840c xen/include/asm-x86/grant_table.h
--- a/xen/include/asm-x86/grant_table.h Fri Mar 10 13:27:24 2006
+++ b/xen/include/asm-x86/grant_table.h Fri Mar 10 15:00:36 2006
@@ -26,9 +26,6 @@
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); \
} while ( 0 )
#define gnttab_shared_mfn(d, t, i) \
diff -r c5286130a96e -r e408a374840c xen/include/asm-x86/page.h
--- a/xen/include/asm-x86/page.h Fri Mar 10 13:27:24 2006
+++ b/xen/include/asm-x86/page.h Fri Mar 10 15:00:36 2006
@@ -190,6 +190,10 @@
/* Shorthand versions of the above functions. */
#define __pa(x) (virt_to_maddr(x))
#define __va(x) (maddr_to_virt(x))
+
+/* Convert between Xen-heap virtual addresses and machine frame numbers. */
+#define virt_to_mfn(va) (virt_to_maddr(va) >> PAGE_SHIFT)
+#define mfn_to_virt(mfn) (maddr_to_virt(mfn << PAGE_SHIFT))
/* Convert between machine frame numbers and page-info structures. */
#define mfn_to_page(mfn) (frame_table + (mfn))
diff -r c5286130a96e -r e408a374840c xen/include/public/memory.h
--- a/xen/include/public/memory.h Fri Mar 10 13:27:24 2006
+++ b/xen/include/public/memory.h Fri Mar 10 15:00:36 2006
@@ -97,25 +97,27 @@
DEFINE_GUEST_HANDLE(xen_machphys_mfn_list_t);
/*
- * Returns the base and size of the specified reserved 'RAM hole' in the
- * specified guest's pseudophysical address space.
- * arg == addr of xen_reserved_phys_area_t.
+ * Sets the GPFN at which a particular page appears in the specified guest's
+ * pseudophysical address space.
+ * arg == addr of xen_add_to_physmap_t.
*/
-#define XENMEM_reserved_phys_area 7
-typedef struct xen_reserved_phys_area {
- /* Which domain to report about? */
+#define XENMEM_add_to_physmap 7
+typedef struct xen_add_to_physmap {
+ /* Which domain to change the mapping for. */
domid_t domid;
- /*
- * Which reserved area to report? Out-of-range request reports
- * -ESRCH. Currently no architecture will have more than one reserved area.
- */
- unsigned int idx;
+ /* Source mapping space. */
+#define XENMAPSPACE_shared_info 0 /* shared info page */
+#define XENMAPSPACE_grant_table 1 /* grant table page */
+ unsigned int space;
- /* Base and size of the specified reserved area. */
- unsigned long first_gpfn, nr_gpfns;
-} xen_reserved_phys_area_t;
-DEFINE_GUEST_HANDLE(xen_reserved_phys_area_t);
+ /* Index into source mapping space. */
+ unsigned long idx;
+
+ /* GPFN where the source mapping page should appear. */
+ unsigned long gpfn;
+} xen_add_to_physmap_t;
+DEFINE_GUEST_HANDLE(xen_add_to_physmap_t);
/*
* Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error
@@ -140,21 +142,6 @@
} xen_translate_gpfn_list_t;
DEFINE_GUEST_HANDLE(xen_translate_gpfn_list_t);
-/*
- * Sets the GPFN at which the shared_info_page appears in the specified
- * guest's pseudophysical address space.
- * arg == addr of xen_map_shared_info_t.
- */
-#define XENMEM_map_shared_info 9
-typedef struct xen_map_shared_info {
- /* Which domain to change the mapping for. */
- domid_t domid;
-
- /* GPFN where the shared_info_page should appear. */
- unsigned long pfn;
-} xen_map_shared_info_t;
-DEFINE_GUEST_HANDLE(xen_map_shared_info_t);
-
#endif /* __XEN_PUBLIC_MEMORY_H__ */
/*
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