xen: Introduce xen_modified_memory.

This function is to be used during live migration. Every write access to the
guest memory should call this funcion so the Xen tools knows which pages are
dirty.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Anthony PERARD 2012-10-03 13:48:45 +00:00 committed by Stefano Stabellini
parent 39f42439d0
commit 910b38e4dc
3 changed files with 26 additions and 0 deletions

View File

@ -48,6 +48,7 @@ void xenstore_store_pv_console_info(int i, struct CharDriverState *chr);
struct MemoryRegion; struct MemoryRegion;
void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
struct MemoryRegion *mr); struct MemoryRegion *mr);
void xen_modified_memory(ram_addr_t start, ram_addr_t length);
#endif #endif
struct MemoryRegion; struct MemoryRegion;

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@ -1228,3 +1228,24 @@ void xen_shutdown_fatal_error(const char *fmt, ...)
/* destroy the domain */ /* destroy the domain */
qemu_system_shutdown_request(); qemu_system_shutdown_request();
} }
void xen_modified_memory(ram_addr_t start, ram_addr_t length)
{
if (unlikely(xen_in_migration)) {
int rc;
ram_addr_t start_pfn, nb_pages;
if (length == 0) {
length = TARGET_PAGE_SIZE;
}
start_pfn = start >> TARGET_PAGE_BITS;
nb_pages = ((start + length + TARGET_PAGE_SIZE - 1) >> TARGET_PAGE_BITS)
- start_pfn;
rc = xc_hvm_modified_memory(xen_xc, xen_domid, start_pfn, nb_pages);
if (rc) {
fprintf(stderr,
"%s failed for "RAM_ADDR_FMT" ("RAM_ADDR_FMT"): %i, %s\n",
__func__, start, nb_pages, rc, strerror(-rc));
}
}
}

View File

@ -59,3 +59,7 @@ void xen_register_framebuffer(MemoryRegion *mr)
void qmp_xen_set_global_dirty_log(bool enable, Error **errp) void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
{ {
} }
void xen_modified_memory(ram_addr_t start, ram_addr_t length)
{
}