# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1207755856 -3600
# Node ID 2fa13df6b409a8f9eb1a4fbb01809981e38c740d
# Parent b41e2bdcad12e1d57cadf978dfe5b32b9b398b15
hvm: Allocate memory for hvm domains in batches.
Without this change, dom0 is unresponsive while the hvm domain's
physmap is populated in xen.
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
xen-unstable changeset: 17416:aee133a8e5e72bc9a6da4bb1619931992da3b6ff
xen-unstable date: Wed Apr 09 15:25:16 2008 +0100
---
tools/libxc/xc_hvm_build.c | 19 +++++++++++++++----
1 files changed, 15 insertions(+), 4 deletions(-)
diff -r b41e2bdcad12 -r 2fa13df6b409 tools/libxc/xc_hvm_build.c
--- a/tools/libxc/xc_hvm_build.c Wed Apr 09 14:58:03 2008 +0100
+++ b/tools/libxc/xc_hvm_build.c Wed Apr 09 16:44:16 2008 +0100
@@ -156,7 +156,7 @@ static int setup_guest(int xc_handle,
{
xen_pfn_t *page_array = NULL;
unsigned long i, nr_pages = (unsigned long)memsize << (20 - PAGE_SHIFT);
- unsigned long shared_page_nr, entry_eip;
+ unsigned long shared_page_nr, entry_eip, cur_pages;
struct xen_add_to_physmap xatp;
struct shared_info *shared_info;
void *e820_page;
@@ -206,12 +206,23 @@ static int setup_guest(int xc_handle,
for ( i = HVM_BELOW_4G_RAM_END >> PAGE_SHIFT; i < nr_pages; i++ )
page_array[i] += HVM_BELOW_4G_MMIO_LENGTH >> PAGE_SHIFT;
- /* Allocate memory for HVM guest, skipping VGA hole 0xA0000-0xC0000. */
+ /*
+ * Allocate memory for HVM guest, skipping VGA hole 0xA0000-0xC0000.
+ * We allocate pages in batches of no more than 2048 to ensure that
+ * we can be preempted and hence dom0 remains responsive.
+ */
rc = xc_domain_memory_populate_physmap(
xc_handle, dom, 0xa0, 0, 0, &page_array[0x00]);
- if ( rc == 0 )
+ cur_pages = 0xc0;
+ while ( (rc == 0) && (nr_pages > cur_pages) )
+ {
+ unsigned long count = nr_pages - cur_pages;
+ if ( count > 2048 )
+ count = 2048;
rc = xc_domain_memory_populate_physmap(
- xc_handle, dom, nr_pages - 0xc0, 0, 0, &page_array[0xc0]);
+ xc_handle, dom, count, 0, 0, &page_array[cur_pages]);
+ cur_pages += count;
+ }
if ( rc != 0 )
{
PERROR("Could not allocate memory for HVM guest.\n");
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