# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1287756891 -3600
# Node ID 5d4e169f1ef0cc1ec40855f42443752b2c29093c
# Parent 02dca31076126f4a0334881eb9a9980fd188cf25
libxc: do not align/lock buffers which do not need it
On restore:
region_mfn is passed to xc_map_foreign_range and
xc_map_foreign_bulk. In both cases the buffer is accessed from the
ioctl handler in the kernel and not from any hypercall. Therefore
normal copy_{to,from}_user handling in the kernel will cope with any
faulting access.
p2m_batch is passed to xc_domain_memory_populate_physmap which takes
care of bouncing the buffer already.
On save:
pfn_type is passed to xc_map_foreign_bulk which does not need locking
as per region_mfn above.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
diff -r 02dca3107612 -r 5d4e169f1ef0 tools/libxc/xc_domain_restore.c
--- a/tools/libxc/xc_domain_restore.c Fri Oct 22 15:14:51 2010 +0100
+++ b/tools/libxc/xc_domain_restore.c Fri Oct 22 15:14:51 2010 +0100
@@ -1172,10 +1172,8 @@ int xc_domain_restore(xc_interface *xch,
ctx->p2m = calloc(dinfo->p2m_size, sizeof(xen_pfn_t));
pfn_type = calloc(dinfo->p2m_size, sizeof(unsigned long));
- region_mfn = xc_memalign(PAGE_SIZE, ROUNDUP(
- MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT));
- ctx->p2m_batch = xc_memalign(
- PAGE_SIZE, ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT));
+ region_mfn = malloc(ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t),
PAGE_SHIFT));
+ ctx->p2m_batch = malloc(ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t),
PAGE_SHIFT));
if ( (ctx->p2m == NULL) || (pfn_type == NULL) ||
(region_mfn == NULL) || (ctx->p2m_batch == NULL) )
@@ -1189,18 +1187,6 @@ int xc_domain_restore(xc_interface *xch,
ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT));
memset(ctx->p2m_batch, 0,
ROUNDUP(MAX_BATCH_SIZE * sizeof(xen_pfn_t), PAGE_SHIFT));
-
- if ( lock_pages(xch, region_mfn, sizeof(xen_pfn_t) * MAX_BATCH_SIZE) )
- {
- PERROR("Could not lock region_mfn");
- goto out;
- }
-
- if ( lock_pages(xch, ctx->p2m_batch, sizeof(xen_pfn_t) * MAX_BATCH_SIZE) )
- {
- ERROR("Could not lock p2m_batch");
- goto out;
- }
/* Get the domain's shared-info frame. */
domctl.cmd = XEN_DOMCTL_getdomaininfo;
diff -r 02dca3107612 -r 5d4e169f1ef0 tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c Fri Oct 22 15:14:51 2010 +0100
+++ b/tools/libxc/xc_domain_save.c Fri Oct 22 15:14:51 2010 +0100
@@ -1071,8 +1071,7 @@ int xc_domain_save(xc_interface *xch, in
analysis_phase(xch, dom, ctx, HYPERCALL_BUFFER(to_skip), 0);
- pfn_type = xc_memalign(PAGE_SIZE, ROUNDUP(
- MAX_BATCH_SIZE * sizeof(*pfn_type), PAGE_SHIFT));
+ pfn_type = malloc(ROUNDUP(MAX_BATCH_SIZE * sizeof(*pfn_type),
PAGE_SHIFT));
pfn_batch = calloc(MAX_BATCH_SIZE, sizeof(*pfn_batch));
pfn_err = malloc(MAX_BATCH_SIZE * sizeof(*pfn_err));
if ( (pfn_type == NULL) || (pfn_batch == NULL) || (pfn_err == NULL) )
@@ -1083,12 +1082,6 @@ int xc_domain_save(xc_interface *xch, in
}
memset(pfn_type, 0,
ROUNDUP(MAX_BATCH_SIZE * sizeof(*pfn_type), PAGE_SHIFT));
-
- if ( lock_pages(xch, pfn_type, MAX_BATCH_SIZE * sizeof(*pfn_type)) )
- {
- PERROR("Unable to lock pfn_type array");
- goto out;
- }
/* Setup the mfn_to_pfn table mapping */
if ( !(ctx->live_m2p = xc_map_m2p(xch, ctx->max_mfn, PROT_READ,
&ctx->m2p_mfn0)) )
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