From: Avi Kivity <[email protected]> Upsteam commit 9fa06385f6 ("kvm: Mark full address range dirty on live migration start") requests dirty logging on the entire 64-bit address space. This triggered an allocation in qemu-kvm.c for this range, which oomed.
Fix by allocating the buffer when we know the actual slot, thus allocating exactly as much memory as necessary. Signed-off-by: Avi Kivity <[email protected]> diff --git a/libkvm-all.h b/libkvm-all.h index 47855be..ecd3065 100644 --- a/libkvm-all.h +++ b/libkvm-all.h @@ -548,7 +548,7 @@ int kvm_register_phys_mem(kvm_context_t kvm, unsigned long len, int log); int kvm_get_dirty_pages(kvm_context_t, unsigned long phys_addr, void *buf); int kvm_get_dirty_pages_range(kvm_context_t kvm, unsigned long phys_addr, - unsigned long end_addr, void *buf, void*opaque, + unsigned long end_addr, void*opaque, int (*cb)(unsigned long start, unsigned long len, void*bitmap, void *opaque)); int kvm_register_coalesced_mmio(kvm_context_t kvm, diff --git a/qemu-kvm.c b/qemu-kvm.c index a2131b7..3105753 100644 --- a/qemu-kvm.c +++ b/qemu-kvm.c @@ -689,21 +689,26 @@ int kvm_get_dirty_pages(kvm_context_t kvm, unsigned long phys_addr, void *buf) } int kvm_get_dirty_pages_range(kvm_context_t kvm, unsigned long phys_addr, - unsigned long len, void *buf, void *opaque, + unsigned long len, void *opaque, int (*cb)(unsigned long start, unsigned long len, void*bitmap, void *opaque)) { int i; int r; unsigned long end_addr = phys_addr + len; + void *buf; for (i = 0; i < KVM_MAX_NUM_MEM_REGIONS; ++i) { if ((slots[i].len && (uint64_t)slots[i].phys_addr >= phys_addr) && ((uint64_t)slots[i].phys_addr + slots[i].len <= end_addr)) { + buf = qemu_malloc((slots[i].len / 4096 + 7) / 8 + 2); r = kvm_get_map(kvm, KVM_GET_DIRTY_LOG, i, buf); - if (r) + if (r) { + qemu_free(buf); return r; + } r = cb(slots[i].phys_addr, slots[i].len, buf, opaque); + qemu_free(buf); if (r) return r; } @@ -2785,7 +2790,7 @@ int kvm_update_dirty_pages_log(void) r = kvm_get_dirty_pages_range(kvm_context, 0, -1UL, - kvm_dirty_bitmap, NULL, + NULL, kvm_get_dirty_bitmap_cb); return r; } @@ -2913,17 +2918,14 @@ void kvm_ioperm(CPUState *env, void *data) int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, target_phys_addr_t end_addr) { #ifndef TARGET_IA64 - void *buf; #ifdef TARGET_I386 if (must_use_aliases_source(start_addr)) return 0; #endif - buf = qemu_malloc((end_addr - start_addr) / 8 + 2); kvm_get_dirty_pages_range(kvm_context, start_addr, end_addr - start_addr, - buf, NULL, kvm_get_dirty_bitmap_cb); - qemu_free(buf); + NULL, kvm_get_dirty_bitmap_cb); #endif return 0; } -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
