diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h index 6346df17ce..6d5318895a 100644 --- a/include/exec/cpu-common.h +++ b/include/exec/cpu-common.h @@ -159,6 +159,8 @@ typedef int (RAMBlockIterFunc)(RAMBlock *rb, void *opaque); int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque); int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length); +int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start, + size_t length); #endif diff --git a/system/physmem.c b/system/physmem.c index 5ebcf5be11..c3d04ca921 100644 --- a/system/physmem.c +++ b/system/physmem.c @@ -3721,6 +3721,29 @@ err: return ret; } +int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start, + size_t length) +{ + int ret = -1; + +#ifdef CONFIG_FALLOCATE_PUNCH_HOLE + ret = fallocate(rb->guest_memfd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, + start, length); + + if (ret) { + ret = -errno; + error_report("%s: Failed to fallocate %s:%" PRIx64 " +%zx (%d)", + __func__, rb->idstr, start, length, ret); + } +#else + ret = -ENOSYS; + error_report("%s: fallocate not available %s:%" PRIx64 " +%zx (%d)", + __func__, rb->idstr, start, length, ret); +#endif + + return ret; +} + bool ramblock_is_pmem(RAMBlock *rb) { return rb->flags & RAM_PMEM;