102 lines
3.5 KiB
Diff
102 lines
3.5 KiB
Diff
From: Olaf Hering <olaf@aepfle.de>
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Date: Fri, 23 Oct 2020 14:44:09 +0200
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Subject: libxc sr restore map_errs
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tools: restore: preallocate map_errs array
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Remove repeated allocation from migration loop. There will never be
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more than MAX_BATCH_SIZE pages to process in an incoming batch.
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Allocate the space once.
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Signed-off-by: Olaf Hering <olaf@aepfle.de>
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---
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tools/libs/guest/xg_sr_common.h | 1 +
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tools/libs/guest/xg_sr_restore.c | 22 +++++++---------------
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2 files changed, 8 insertions(+), 15 deletions(-)
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--- a/tools/libs/guest/xg_sr_common.h
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+++ b/tools/libs/guest/xg_sr_common.h
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@@ -259,6 +259,7 @@ struct xc_sr_context
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xen_pfn_t *pfns;
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uint32_t *types;
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xen_pfn_t *mfns;
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+ int *map_errs;
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int send_back_fd;
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unsigned long p2m_size;
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--- a/tools/libs/guest/xg_sr_restore.c
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+++ b/tools/libs/guest/xg_sr_restore.c
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@@ -204,21 +204,12 @@ static int process_page_data(struct xc_s
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xen_pfn_t *pfns, uint32_t *types, void *page_data)
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{
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xc_interface *xch = ctx->xch;
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- int *map_errs = malloc(count * sizeof(*map_errs));
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int rc;
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void *mapping = NULL, *guest_page = NULL;
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unsigned int i, /* i indexes the pfns from the record. */
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j, /* j indexes the subset of pfns we decide to map. */
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nr_pages = 0;
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- if ( !map_errs )
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- {
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- rc = -1;
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- ERROR("Failed to allocate %zu bytes to process page data",
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- count * sizeof(*map_errs));
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- goto err;
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- }
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-
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rc = populate_pfns(ctx, count, pfns, types);
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if ( rc )
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{
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@@ -240,7 +231,7 @@ static int process_page_data(struct xc_s
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mapping = guest_page = xenforeignmemory_map(
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xch->fmem, ctx->domid, PROT_READ | PROT_WRITE,
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- nr_pages, ctx->restore.mfns, map_errs);
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+ nr_pages, ctx->restore.mfns, ctx->restore.map_errs);
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if ( !mapping )
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{
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rc = -1;
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@@ -254,11 +245,11 @@ static int process_page_data(struct xc_s
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if ( !page_type_has_stream_data(types[i]) )
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continue;
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- if ( map_errs[j] )
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+ if ( ctx->restore.map_errs[j] )
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{
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rc = -1;
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ERROR("Mapping pfn %#"PRIpfn" (mfn %#"PRIpfn", type %#"PRIx32") failed with %d",
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- pfns[i], ctx->restore.mfns[j], types[i], map_errs[j]);
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+ pfns[i], ctx->restore.mfns[j], types[i], ctx->restore.map_errs[j]);
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goto err;
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}
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@@ -296,8 +287,6 @@ static int process_page_data(struct xc_s
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if ( mapping )
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xenforeignmemory_unmap(xch->fmem, mapping, nr_pages);
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- free(map_errs);
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-
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return rc;
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}
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@@ -704,7 +693,9 @@ static int setup(struct xc_sr_context *c
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ctx->restore.pfns = malloc(MAX_BATCH_SIZE * sizeof(*ctx->restore.pfns));
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ctx->restore.types = malloc(MAX_BATCH_SIZE * sizeof(*ctx->restore.types));
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ctx->restore.mfns = malloc(MAX_BATCH_SIZE * sizeof(*ctx->restore.mfns));
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- if ( !ctx->restore.pfns || !ctx->restore.types || !ctx->restore.mfns )
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+ ctx->restore.map_errs = malloc(MAX_BATCH_SIZE * sizeof(*ctx->restore.map_errs));
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+ if ( !ctx->restore.pfns || !ctx->restore.types || !ctx->restore.mfns ||
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+ !ctx->restore.map_errs )
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{
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ERROR("Unable to allocate memory");
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rc = -1;
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@@ -741,6 +732,7 @@ static void cleanup(struct xc_sr_context
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free(ctx->restore.buffered_records);
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free(ctx->restore.populated_pfns);
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+ free(ctx->restore.map_errs);
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free(ctx->restore.mfns);
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free(ctx->restore.types);
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free(ctx->restore.pfns);
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