Add qemu_ram_remap
PATCH 1/2 Add qemu_ram_remap
qemu_ram_remap() unmaps the specified RAM pages, then re-maps these pages again. This is used by KVM HWPoison support to clear HWPoisoned page tables across guest rebooting, so that a new page may be allocated later to recover the memory error.
Signed-off-by Huang Ying <[email protected]>
--- cpu-all.h | 4 +++ cpu-common.h | 1 exec.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 65 insertions(+), 1 deletion(-)
cpu-all.h +4 -0
@@ -863,10 +863,14 @@ target_phys_addr_t cpu_get_phys_page_debextern int phys_ram_fd;extern ram_addr_t ram_size; +/* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */ +#define RAM_PREALLOC_MASK (1 << 0) + typedef struct RAMBlock { uint8_t *host; ram_addr_t offset; ram_addr_t length; + uint32_t flags; char idstr[256]; QLIST_ENTRY(RAMBlock) next; #if defined(__linux__) && !defined(TARGET_S390X)
exec.c +60 -1
79 lines not on this page · raw message
cpu-common.h +1 -0
@@ -50,6 +50,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(Devic ram_addr_t size, void *host);ram_addr_t qemu_ram_alloc (DeviceState *dev,const char *name,ram_addr_t size);void qemu_ram_free (ram_addr_t addr); +void qemu_ram_remap (ram_addr_t addr,ram_addr_t length);/* This should only be used for ram local to a device. */ void *qemu_get_ram_ptr (ram_addr_t addr);/* Same but slower, to use for migration, where the order of