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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/1] xc_domain_restore: Allow QEMU to increase memory
If QEMU has called on xc_domain_setmaxmem to add more memory for
option ROMs, domain restore needs to also increase the memory.
Signed-off-by: Don Slutz <dslutz@xxxxxxxxxxx>
---
To see the hvmloader loader issue:
xl cre -p e1000x8.xfg
xl save e1000x8 e1000x8.save
xl restore e1000x8.save
With e1000x8.xfg:
-------------------------------------------------------------------------------
builder = "hvm"
device_model_args_hvm = [
"-monitor",
"pty",
"-boot",
"menu=on",
]
device_model_version = "qemu-xen"
disk = [
"/dev/etherd/e500.1,,xvda",
"/dev/etherd/e500.2,,xvdb",
"/dev/etherd/e500.3,,xvde",
"/local-isos/iso/centos/x86_64/CentOS-6.3-x86_64-bin-DVD1.iso,,hdc,cdrom",
"/local-isos/iso/centos/x86_64/CentOS-6.3-x86_64-bin-DVD2.iso,,hdd,cdrom",
]
maxmem = "8192"
memory = "8192"
name = "e1000x8"
serial = "pty"
tsc_mode = "native_paravirt"
uuid = "e5000105-3d83-c962-07ae-2bc46c3644a0"
videoram = "16"
vif = [
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:a0",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:aa",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:b4",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:be",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:c8",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:d2",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:dc",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:e6",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:f0",
"model=e1000,bridge=xenbr0,mac=00:0c:29:86:44:fa",
]
viridian = 0
xen_platform_pci = 1
mmio_hole = 2048
vcpus = 1
maxvcpus = 6
on_poweroff = "preserve"
on_reboot = "preserve"
on_watchdog = "preserve"
on_crash = "preserve"
-------------------------------------------------------------------------------
tools/libxc/xc_domain_restore.c | 75 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 73 insertions(+), 2 deletions(-)
diff --git a/tools/libxc/xc_domain_restore.c b/tools/libxc/xc_domain_restore.c
index 2ab9f46..28b4fa6 100644
--- a/tools/libxc/xc_domain_restore.c
+++ b/tools/libxc/xc_domain_restore.c
@@ -47,6 +47,13 @@
#include <xen/hvm/ioreq.h>
#include <xen/hvm/params.h>
+/* Leave some slack so that hvmloader does not complain about lack of
+ * memory at boot time ("Could not allocate order=0 extent").
+ * Once hvmloader is modified to cope with that situation without
+ * printing warning messages, QEMU_SPARE_PAGES can be removed.
+ */
+#define QEMU_SPARE_PAGES 16
+
struct restore_ctx {
unsigned long max_mfn; /* max mfn of the current host machine */
unsigned long hvirt_start; /* virtual starting address of the hypervisor */
@@ -209,12 +216,44 @@ static int uncanonicalize_pagetable(
if (!ctx->hvm && ctx->superpages)
rc = alloc_superpage_mfns(xch, dom, ctx, nr_mfns);
else
+ {
+ xc_domaininfo_t info;
+ unsigned long free_pages;
+
+ if ((xc_domain_getinfolist(xch, dom, 1, &info) != 1) ||
+ (info.domain != dom)) {
+ ERROR("Failed xc_domain_getinfolist for batch
(uncanonicalize_pagetable)\n");
+ errno = ENOMEM;
+ return 0;
+ }
+ free_pages = info.max_pages - info.tot_pages;
+ if (free_pages > QEMU_SPARE_PAGES) {
+ free_pages -= QEMU_SPARE_PAGES;
+ } else {
+ free_pages = 0;
+ }
+ if (free_pages < nr_mfns)
+ {
+ DPRINTF("Adjust memory for batch (uncanonicalize_pagetable):
free_pages=%lu nr_mfns=%d max_pages=%lu tot_pages=%lu max_mfn=%lu\n",
+ free_pages, nr_mfns, (unsigned long)info.max_pages,
+ (unsigned long)info.tot_pages, ctx->max_mfn);
+ if (xc_domain_setmaxmem(xch, dom,
+ ((info.max_pages + nr_mfns -
free_pages)
+ << (XC_PAGE_SHIFT - 10))) < 0)
+ {
+ ERROR("Failed xc_domain_setmaxmem for batch
(uncanonicalize_pagetable)\n");
+ errno = ENOMEM;
+ return 0;
+ }
+ }
rc = xc_domain_populate_physmap_exact(xch, dom, nr_mfns, 0, 0,
ctx->p2m_batch);
+ }
if (rc)
{
- ERROR("Failed to allocate memory for batch.!\n");
+ ERROR("Failed to allocate memory for batch. rc=%d nr_mfns=%d!\n",
+ rc, nr_mfns);
errno = ENOMEM;
return 0;
}
@@ -1241,12 +1280,44 @@ static int apply_batch(xc_interface *xch, uint32_t dom,
struct restore_ctx *ctx,
if (!ctx->hvm && ctx->superpages)
rc = alloc_superpage_mfns(xch, dom, ctx, nr_mfns);
else
+ {
+ xc_domaininfo_t info;
+ unsigned long free_pages;
+
+ if ((xc_domain_getinfolist(xch, dom, 1, &info) != 1) ||
+ (info.domain != dom)) {
+ ERROR("Failed xc_domain_getinfolist for apply_batch\n");
+ errno = ENOMEM;
+ return -1;
+ }
+ free_pages = info.max_pages - info.tot_pages;
+ if (free_pages > QEMU_SPARE_PAGES) {
+ free_pages -= QEMU_SPARE_PAGES;
+ } else {
+ free_pages = 0;
+ }
+ if (free_pages < nr_mfns)
+ {
+ DPRINTF("Adjust memory for apply_batch: free_pages=%lu
nr_mfns=%d max_pages=%lu tot_pages=%lu max_mfn=%lu\n",
+ free_pages, nr_mfns, (unsigned long)info.max_pages,
+ (unsigned long)info.tot_pages, ctx->max_mfn);
+ if (xc_domain_setmaxmem(xch, dom,
+ ((info.max_pages + nr_mfns -
free_pages)
+ << (XC_PAGE_SHIFT - 10))) < 0)
+ {
+ ERROR("Failed xc_domain_setmaxmem for apply_batch\n");
+ errno = ENOMEM;
+ return -1;
+ }
+ }
rc = xc_domain_populate_physmap_exact(xch, dom, nr_mfns, 0, 0,
ctx->p2m_batch);
+ }
if (rc)
{
- ERROR("Failed to allocate memory for batch.!\n");
+ ERROR("Failed to allocate memory for apply_batch. rc=%d nr_mfns=%d
max_mfn=%lu!\n",
+ rc, nr_mfns, ctx->max_mfn);
errno = ENOMEM;
return -1;
}
--
1.8.4
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