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Xen 2017/07/21

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Merge remote-tracking branch 'remotes/sstabellini/tags/xen-20170721-tag' into staging

Xen 2017/07/21

# gpg: Signature made Sat 22 Jul 2017 01:43:34 BST
# gpg:                using RSA key 0x894F8F4870E1AE90
# gpg: Good signature from "Stefano Stabellini <stefano.stabellini@eu.citrix.com>"
# gpg:                 aka "Stefano Stabellini <sstabellini@kernel.org>"
# Primary key fingerprint: D04E 33AB A51F 67BA 07D3  0AEA 894F 8F48 70E1 AE90

* remotes/sstabellini/tags/xen-20170721-tag:
  xen-mapcache: Fix the bug when overlapping emulated DMA operations may cause inconsistency in guest memory mappings
  xen: fix compilation on 32-bit hosts

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2017-07-24 10:01:15 +01:00
parent 91939262ff 7fb394ad8a
commit df95f1a298
1 changed files with 16 additions and 6 deletions
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22
hw/i386/xen/xen-mapcache.c
View file

@ -234,7 +234,8 @@ static void xen_remap_bucket(MapCacheEntry *entry,
static uint8_t *xen_map_cache_unlocked(hwaddr phys_addr, hwaddr size,
uint8_t lock, bool dma)
{
MapCacheEntry *entry, *pentry = NULL;
MapCacheEntry *entry, *pentry = NULL,
*free_entry = NULL, *free_pentry = NULL;
hwaddr address_index;
hwaddr address_offset;
hwaddr cache_size = size;
@ -281,14 +282,22 @@ tryagain:
entry = &mapcache->entry[address_index % mapcache->nr_buckets];
while (entry && entry->lock && entry->vaddr_base &&
while (entry && (lock || entry->lock) && entry->vaddr_base &&
(entry->paddr_index != address_index || entry->size != cache_size ||
!test_bits(address_offset >> XC_PAGE_SHIFT,
test_bit_size >> XC_PAGE_SHIFT,
entry->valid_mapping))) {
if (!free_entry && !entry->lock) {
free_entry = entry;
free_pentry = pentry;
}
pentry = entry;
entry = entry->next;
}
if (!entry && free_entry) {
entry = free_entry;
pentry = free_pentry;
}
if (!entry) {
entry = g_malloc0(sizeof (MapCacheEntry));
pentry->next = entry;
@ -527,7 +536,7 @@ static uint8_t *xen_replace_cache_entry_unlocked(hwaddr old_phys_addr,
entry = entry->next;
}
if (!entry) {
DPRINTF("Trying to update an entry for %lx " \
DPRINTF("Trying to update an entry for "TARGET_FMT_plx \
"that is not in the mapcache!\n", old_phys_addr);
return NULL;
}
@ -535,15 +544,16 @@ static uint8_t *xen_replace_cache_entry_unlocked(hwaddr old_phys_addr,
address_index = new_phys_addr >> MCACHE_BUCKET_SHIFT;
address_offset = new_phys_addr & (MCACHE_BUCKET_SIZE - 1);
fprintf(stderr, "Replacing a dummy mapcache entry for %lx with %lx\n",
old_phys_addr, new_phys_addr);
fprintf(stderr, "Replacing a dummy mapcache entry for "TARGET_FMT_plx \
" with "TARGET_FMT_plx"\n", old_phys_addr, new_phys_addr);
xen_remap_bucket(entry, entry->vaddr_base,
cache_size, address_index, false);
if (!test_bits(address_offset >> XC_PAGE_SHIFT,
test_bit_size >> XC_PAGE_SHIFT,
entry->valid_mapping)) {
DPRINTF("Unable to update a mapcache entry for %lx!\n", old_phys_addr);
DPRINTF("Unable to update a mapcache entry for "TARGET_FMT_plx"!\n",
old_phys_addr);
return NULL;
}