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xen/libxc-sr-xg_sr_bitmap-populated_pfns.patch

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From: Olaf Hering <olaf@aepfle.de>
Date: Fri, 5 Feb 2021 20:16:02 +0100
Subject: libxc sr xg_sr_bitmap populated_pfns
tools: use xg_sr_bitmap for populated_pfns
Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
tools/libs/guest/xg_sr_common.h | 20 ++++++-
tools/libs/guest/xg_sr_restore.c | 69 ------------------------
tools/libs/guest/xg_sr_restore_x86_hvm.c | 9 ++++
tools/libs/guest/xg_sr_restore_x86_pv.c | 7 +++
4 files changed, 34 insertions(+), 71 deletions(-)
--- a/tools/libs/guest/xg_sr_common.h
+++ b/tools/libs/guest/xg_sr_common.h
@@ -375,8 +375,7 @@ struct xc_sr_context
uint32_t xenstore_domid, console_domid;
/* Bitmap of currently populated PFNs during restore. */
- unsigned long *populated_pfns;
- xen_pfn_t max_populated_pfn;
+ struct sr_bitmap populated_pfns;
/* Sender has invoked verify mode on the stream. */
bool verify;
@@ -632,6 +631,23 @@ static inline bool page_type_has_stream_
}
}
+static inline bool pfn_is_populated(struct xc_sr_context *ctx, xen_pfn_t pfn)
+{
+ return sr_test_bit(pfn, &ctx->restore.populated_pfns);
+}
+
+static inline int pfn_set_populated(struct xc_sr_context *ctx, xen_pfn_t pfn)
+{
+ xc_interface *xch = ctx->xch;
+
+ if ( sr_set_bit(pfn, &ctx->restore.populated_pfns) == false )
+ {
+ PERROR("Failed to realloc populated_pfns bitmap");
+ errno = ENOMEM;
+ return -1;
+ }
+ return 0;
+}
#endif
/*
* Local variables:
--- a/tools/libs/guest/xg_sr_restore.c
+++ b/tools/libs/guest/xg_sr_restore.c
@@ -72,64 +72,6 @@ static int read_headers(struct xc_sr_con
}
/*
- * Is a pfn populated?
- */
-static bool pfn_is_populated(const struct xc_sr_context *ctx, xen_pfn_t pfn)
-{
- if ( pfn > ctx->restore.max_populated_pfn )
- return false;
- return test_bit(pfn, ctx->restore.populated_pfns);
-}
-
-/*
- * Set a pfn as populated, expanding the tracking structures if needed. To
- * avoid realloc()ing too excessively, the size increased to the nearest power
- * of two large enough to contain the required pfn.
- */
-static int pfn_set_populated(struct xc_sr_context *ctx, xen_pfn_t pfn)
-{
- xc_interface *xch = ctx->xch;
-
- if ( pfn > ctx->restore.max_populated_pfn )
- {
- xen_pfn_t new_max;
- size_t old_sz, new_sz;
- unsigned long *p;
-
- /* Round up to the nearest power of two larger than pfn, less 1. */
- new_max = pfn;
- new_max |= new_max >> 1;
- new_max |= new_max >> 2;
- new_max |= new_max >> 4;
- new_max |= new_max >> 8;
- new_max |= new_max >> 16;
-#ifdef __x86_64__
- new_max |= new_max >> 32;
-#endif
-
- old_sz = bitmap_size(ctx->restore.max_populated_pfn + 1);
- new_sz = bitmap_size(new_max + 1);
- p = realloc(ctx->restore.populated_pfns, new_sz);
- if ( !p )
- {
- ERROR("Failed to realloc populated bitmap");
- errno = ENOMEM;
- return -1;
- }
-
- memset((uint8_t *)p + old_sz, 0x00, new_sz - old_sz);
-
- ctx->restore.populated_pfns = p;
- ctx->restore.max_populated_pfn = new_max;
- }
-
- assert(!test_bit(pfn, ctx->restore.populated_pfns));
- set_bit(pfn, ctx->restore.populated_pfns);
-
- return 0;
-}
-
-/*
* Given a set of pfns, obtain memory from Xen to fill the physmap for the
* unpopulated subset. If types is NULL, no page type checking is performed
* and all unpopulated pfns are populated.
@@ -911,16 +853,6 @@ static int setup(struct xc_sr_context *c
if ( rc )
goto err;
- ctx->restore.max_populated_pfn = (32 * 1024 / 4) - 1;
- ctx->restore.populated_pfns = bitmap_alloc(
- ctx->restore.max_populated_pfn + 1);
- if ( !ctx->restore.populated_pfns )
- {
- ERROR("Unable to allocate memory for populated_pfns bitmap");
- rc = -1;
- goto err;
- }
-
ctx->restore.pfns = malloc(MAX_BATCH_SIZE * sizeof(*ctx->restore.pfns));
ctx->restore.types = malloc(MAX_BATCH_SIZE * sizeof(*ctx->restore.types));
ctx->restore.mfns = malloc(MAX_BATCH_SIZE * sizeof(*ctx->restore.mfns));
@@ -969,7 +901,6 @@ static void cleanup(struct xc_sr_context
xch, dirty_bitmap, NRPAGES(bitmap_size(ctx->restore.p2m_size)));
free(ctx->restore.buffered_records);
- free(ctx->restore.populated_pfns);
free(ctx->restore.pages);
free(ctx->restore.iov);
free(ctx->restore.guest_data);
--- a/tools/libs/guest/xg_sr_restore_x86_hvm.c
+++ b/tools/libs/guest/xg_sr_restore_x86_hvm.c
@@ -136,6 +136,7 @@ static int x86_hvm_localise_page(struct
static int x86_hvm_setup(struct xc_sr_context *ctx)
{
xc_interface *xch = ctx->xch;
+ unsigned long max_pfn, max_pages = ctx->dominfo.max_pages;
if ( ctx->restore.guest_type != DHDR_TYPE_X86_HVM )
{
@@ -161,6 +162,13 @@ static int x86_hvm_setup(struct xc_sr_co
}
#endif
+ max_pfn = max(ctx->restore.p2m_size, max_pages);
+ if ( !sr_bitmap_expand(&ctx->restore.populated_pfns, max_pfn) )
+ {
+ PERROR("Unable to allocate memory for populated_pfns bitmap");
+ return -1;
+ }
+
return 0;
}
@@ -241,6 +249,7 @@ static int x86_hvm_stream_complete(struc
static int x86_hvm_cleanup(struct xc_sr_context *ctx)
{
+ sr_bitmap_free(&ctx->restore.populated_pfns);
free(ctx->x86.hvm.restore.context.ptr);
free(ctx->x86.restore.cpuid.ptr);
--- a/tools/libs/guest/xg_sr_restore_x86_pv.c
+++ b/tools/libs/guest/xg_sr_restore_x86_pv.c
@@ -1060,6 +1060,12 @@ static int x86_pv_setup(struct xc_sr_con
if ( rc )
return rc;
+ if ( !sr_bitmap_expand(&ctx->restore.populated_pfns, 32 * 1024 / 4) )
+ {
+ PERROR("Unable to allocate memory for populated_pfns bitmap");
+ return -1;
+ }
+
ctx->x86.pv.restore.nr_vcpus = ctx->dominfo.max_vcpu_id + 1;
ctx->x86.pv.restore.vcpus = calloc(sizeof(struct xc_sr_x86_pv_restore_vcpu),
ctx->x86.pv.restore.nr_vcpus);
@@ -1153,6 +1159,7 @@ static int x86_pv_stream_complete(struct
*/
static int x86_pv_cleanup(struct xc_sr_context *ctx)
{
+ sr_bitmap_free(&ctx->restore.populated_pfns);
free(ctx->x86.pv.p2m);
free(ctx->x86.pv.p2m_pfns);
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