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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [HVM] Save/restore: don't try to save the MMIO memory-hole at 4GB.
# HG changeset patch
# User Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
# Date 1170869392 0
# Node ID 780f097b54c5f9161f7c6cf3f86b2bb72cc43587
# Parent ce97d6714be402b1ed2662313aff626d806874a3
[HVM] Save/restore: don't try to save the MMIO memory-hole at 4GB.
Also remove two integer arrays that were set to a[i] == i.
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
---
tools/libxc/xc_hvm_save.c | 70 +++++++++++++++++-----------------------------
1 files changed, 27 insertions(+), 43 deletions(-)
diff -r ce97d6714be4 -r 780f097b54c5 tools/libxc/xc_hvm_save.c
--- a/tools/libxc/xc_hvm_save.c Wed Feb 07 17:29:21 2007 +0000
+++ b/tools/libxc/xc_hvm_save.c Wed Feb 07 17:29:52 2007 +0000
@@ -27,6 +27,7 @@
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
+#include <xen/hvm/e820.h>
#include "xc_private.h"
#include "xg_private.h"
@@ -275,9 +276,8 @@ int xc_hvm_save(int xc_handle, int io_fd
/* A copy of the CPU context of the guest. */
vcpu_guest_context_t ctxt;
- /* A table containg the type of each PFN (/not/ MFN!). */
- unsigned long *pfn_type = NULL;
- unsigned long *pfn_batch = NULL;
+ /* A table containg the PFNs (/not/ MFN!) to map. */
+ xen_pfn_t *pfn_batch = NULL;
/* A copy of hvm domain context buffer*/
uint32_t hvm_buf_size;
@@ -290,7 +290,6 @@ int xc_hvm_save(int xc_handle, int io_fd
unsigned char *region_base = NULL;
uint32_t nr_pfns, rec_size, nr_vcpus;
- unsigned long *page_array = NULL;
/* power of 2 order of max_pfn */
int order_nr;
@@ -361,18 +360,12 @@ int xc_hvm_save(int xc_handle, int io_fd
goto out;
}
- max_pfn = live_shinfo->arch.max_pfn;
-
DPRINTF("saved hvm domain info:max_memkb=0x%lx, max_mfn=0x%lx,
nr_pages=0x%lx\n", info.max_memkb, max_mfn, info.nr_pages);
- /* nr_pfns: total pages excluding vga acc mem
- * max_pfn: nr_pfns + 0x20 vga hole(0xa0~0xc0)
- * getdomaininfo.tot_pages: all the allocated pages for this domain
- */
if (live) {
ERROR("hvm domain doesn't support live migration now.\n");
goto out;
-
+
if (xc_shadow_control(xc_handle, dom,
XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
NULL, 0, NULL, 0, NULL) < 0) {
@@ -381,6 +374,7 @@ int xc_hvm_save(int xc_handle, int io_fd
}
/* excludes vga acc mem */
+ /* XXX will need to check whether acceleration is enabled here! */
nr_pfns = info.nr_pages - 0x800;
last_iter = 0;
@@ -396,8 +390,8 @@ int xc_hvm_save(int xc_handle, int io_fd
ERROR("HVM Domain appears not to have suspended");
goto out;
}
- nr_pfns = info.nr_pages;
- DPRINTF("after suspend hvm domain nr_pages=0x%x.\n", nr_pfns);
+
+ nr_pfns = info.nr_pages;
}
DPRINTF("after 1st handle hvm domain nr_pfns=0x%x, nr_pages=0x%lx,
max_memkb=0x%lx, live=%d.\n",
@@ -406,10 +400,15 @@ int xc_hvm_save(int xc_handle, int io_fd
info.max_memkb,
live);
- nr_pfns = info.nr_pages;
-
- /*XXX: caculate the VGA hole*/
- max_pfn = nr_pfns + 0x20;
+ /* Calculate the highest PFN of "normal" memory:
+ * HVM memory is sequential except for the VGA and MMIO holes, and
+ * we have nr_pfns of it (which now excludes the cirrus video RAM) */
+ max_pfn = nr_pfns;
+ /* Skip the VGA hole from 0xa0000 to 0xc0000 */
+ max_pfn += 0x20;
+ /* Skip the MMIO hole: 256MB just below 4GB */
+ if ( max_pfn >= (HVM_BELOW_4G_MMIO_START >> PAGE_SHIFT) )
+ max_pfn += (HVM_BELOW_4G_MMIO_LENGTH >> PAGE_SHIFT);
skip_this_iter = 0;/*XXX*/
/* pretend we sent all the pages last iteration */
@@ -424,7 +423,6 @@ int xc_hvm_save(int xc_handle, int io_fd
to_send = malloc(BITMAP_SIZE);
to_skip = malloc(BITMAP_SIZE);
- page_array = (unsigned long *) malloc( sizeof(unsigned long) * max_pfn);
hvm_buf_size = xc_domain_hvm_getcontext(xc_handle, dom, 0, 0);
if ( hvm_buf_size == -1 )
@@ -434,7 +432,7 @@ int xc_hvm_save(int xc_handle, int io_fd
}
hvm_buf = malloc(hvm_buf_size);
- if (!to_send ||!to_skip ||!page_array ||!hvm_buf) {
+ if (!to_send ||!to_skip ||!hvm_buf) {
ERROR("Couldn't allocate memory");
goto out;
}
@@ -454,23 +452,13 @@ int xc_hvm_save(int xc_handle, int io_fd
analysis_phase(xc_handle, dom, max_pfn, to_skip, 0);
- /* get all the HVM domain pfns */
- for ( i = 0; i < max_pfn; i++)
- page_array[i] = i;
-
/* We want zeroed memory so use calloc rather than malloc. */
- pfn_type = calloc(MAX_BATCH_SIZE, sizeof(*pfn_type));
pfn_batch = calloc(MAX_BATCH_SIZE, sizeof(*pfn_batch));
- if ((pfn_type == NULL) || (pfn_batch == NULL)) {
- ERROR("failed to alloc memory for pfn_type and/or pfn_batch arrays");
+ if (pfn_batch == NULL) {
+ ERROR("failed to alloc memory for pfn_batch array");
errno = ENOMEM;
- goto out;
- }
-
- if (lock_pages(pfn_type, MAX_BATCH_SIZE * sizeof(*pfn_type))) {
- ERROR("Unable to lock");
goto out;
}
@@ -511,16 +499,15 @@ int xc_hvm_save(int xc_handle, int io_fd
}
- /* load pfn_type[] with the mfn of all the pages we're doing in
+ /* load pfn_batch[] with the mfn of all the pages we're doing in
this batch. */
for (batch = 0; batch < MAX_BATCH_SIZE && N < max_pfn ; N++) {
int n = permute(N, max_pfn, order_nr);
if (debug) {
- DPRINTF("%d pfn= %08lx mfn= %08lx %d \n",
- iter, (unsigned long)n, page_array[n],
- test_bit(n, to_send));
+ DPRINTF("%d pfn= %08lx %d \n",
+ iter, (unsigned long)n, test_bit(n, to_send));
}
if (!last_iter && test_bit(n, to_send)&& test_bit(n, to_skip))
@@ -530,10 +517,12 @@ int xc_hvm_save(int xc_handle, int io_fd
(test_bit(n, to_send) && last_iter)))
continue;
- if (n >= 0xa0 && n < 0xc0) {
-/* DPRINTF("get a vga hole pfn= %x.\n", n);*/
+ /* Skip PFNs that aren't really there */
+ if ((n >= 0xa0 && n < 0xc0) /* VGA hole */
+ || (n >= (HVM_BELOW_4G_MMIO_START >> PAGE_SHIFT)
+ && n < (1ULL << 32) >> PAGE_SHIFT)) /* 4G MMIO hole */
continue;
- }
+
/*
** we get here if:
** 1. page is marked to_send & hasn't already been re-dirtied
@@ -541,7 +530,6 @@ int xc_hvm_save(int xc_handle, int io_fd
*/
pfn_batch[batch] = n;
- pfn_type[batch] = page_array[n];
batch++;
}
@@ -573,7 +561,6 @@ int xc_hvm_save(int xc_handle, int io_fd
goto out;
}
-
sent_this_iter += batch;
munmap(region_base, batch*PAGE_SIZE);
@@ -723,9 +710,6 @@ int xc_hvm_save(int xc_handle, int io_fd
}
free(hvm_buf);
- free(page_array);
-
- free(pfn_type);
free(pfn_batch);
free(to_send);
free(to_skip);
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