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xen mapcache: check if memory region has moved.

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This patch changes the xen_map_cache behavior. Before trying to map a guest
addr, mapcache will look into the list of range of address that have been moved
(physmap/set_memory). There is currently one memory space like this, the vram,
"moved" from were it's allocated to were the guest will look into.

This help to have a succefull migration.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Anthony PERARD 2012-01-18 12:21:38 +00:00 • committed by Stefano Stabellini
parent d1814e08c0
commit cd1ba7de23
3 changed files with 43 additions and 6 deletions
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22
xen-mapcache.c
View file

@ -78,6 +78,9 @@ typedef struct MapCache {
uint8_t *last_address_vaddr;
unsigned long max_mcache_size;
unsigned int mcache_bucket_shift;
phys_offset_to_gaddr_t phys_offset_to_gaddr;
void *opaque;
} MapCache;
static MapCache *mapcache;
@ -91,13 +94,16 @@ static inline int test_bits(int nr, int size, const unsigned long *addr)
return 0;
}
void xen_map_cache_init(void)
void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
{
unsigned long size;
struct rlimit rlimit_as;
mapcache = g_malloc0(sizeof (MapCache));
mapcache->phys_offset_to_gaddr = f;
mapcache->opaque = opaque;
QTAILQ_INIT(&mapcache->locked_entries);
mapcache->last_address_index = -1;
@ -193,9 +199,14 @@ uint8_t *xen_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size,
uint8_t lock)
{
MapCacheEntry *entry, *pentry = NULL;
target_phys_addr_t address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
target_phys_addr_t address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
target_phys_addr_t address_index;
target_phys_addr_t address_offset;
target_phys_addr_t __size = size;
bool translated = false;
tryagain:
address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
trace_xen_map_cache(phys_addr);
@ -237,6 +248,11 @@ uint8_t *xen_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size,
if(!test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT,
entry->valid_mapping)) {
mapcache->last_address_index = -1;
if (!translated && mapcache->phys_offset_to_gaddr) {
phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size, mapcache->opaque);
translated = true;
goto tryagain;
}
trace_xen_map_cache_return(NULL);
return NULL;
}