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Add qemu_ram_remap

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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.

[ Jan: style fixlets, WIN32 fix ]

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Huang Ying 2011-03-02 08:56:19 +01:00 committed by Marcelo Tosatti
parent 75d4949733
commit cd19cfa236
3 changed files with 67 additions and 1 deletions
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4
cpu-all.h
View File

@ -863,10 +863,14 @@ target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr);
extern 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)

1
cpu-common.h
View File

@ -50,6 +50,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
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

63
exec.c
View File

@ -2867,6 +2867,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
if (host) {
new_block->host = host;
new_block->flags |= RAM_PREALLOC_MASK;
} else {
if (mem_path) {
#if defined (__linux__) && !defined(TARGET_S390X)
@ -2920,7 +2921,9 @@ void qemu_ram_free(ram_addr_t addr)
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (addr == block->offset) {
QLIST_REMOVE(block, next);
if (mem_path) {
if (block->flags & RAM_PREALLOC_MASK) {
;
} else if (mem_path) {
#if defined (__linux__) && !defined(TARGET_S390X)
if (block->fd) {
munmap(block->host, block->length);
@ -2943,6 +2946,64 @@ void qemu_ram_free(ram_addr_t addr)
}
#ifndef _WIN32
void qemu_ram_remap(ram_addr_t addr, ram_addr_t length)
{
RAMBlock *block;
ram_addr_t offset;
int flags;
void *area, *vaddr;
QLIST_FOREACH(block, &ram_list.blocks, next) {
offset = addr - block->offset;
if (offset < block->length) {
vaddr = block->host + offset;
if (block->flags & RAM_PREALLOC_MASK) {
;
} else {
flags = MAP_FIXED;
munmap(vaddr, length);
if (mem_path) {
#if defined(__linux__) && !defined(TARGET_S390X)
if (block->fd) {
#ifdef MAP_POPULATE
flags |= mem_prealloc ? MAP_POPULATE | MAP_SHARED :
MAP_PRIVATE;
#else
flags |= MAP_PRIVATE;
#endif
area = mmap(vaddr, length, PROT_READ | PROT_WRITE,
flags, block->fd, offset);
} else {
flags |= MAP_PRIVATE | MAP_ANONYMOUS;
area = mmap(vaddr, length, PROT_READ | PROT_WRITE,
flags, -1, 0);
}
#endif
} else {
#if defined(TARGET_S390X) && defined(CONFIG_KVM)
flags |= MAP_SHARED | MAP_ANONYMOUS;
area = mmap(vaddr, length, PROT_EXEC|PROT_READ|PROT_WRITE,
flags, -1, 0);
#else
flags |= MAP_PRIVATE | MAP_ANONYMOUS;
area = mmap(vaddr, length, PROT_READ | PROT_WRITE,
flags, -1, 0);
#endif
}
if (area != vaddr) {
fprintf(stderr, "Could not remap addr: %lx@%lx\n",
length, addr);
exit(1);
}
qemu_madvise(vaddr, length, QEMU_MADV_MERGEABLE);
}
return;
}
}
}
#endif /* !_WIN32 */
/* Return a host pointer to ram allocated with qemu_ram_alloc.
With the exception of the softmmu code in this file, this should
only be used for local memory (e.g. video ram) that the device owns,