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accel/kvm: Zero out mem explicitly in kvm_set_user_memory_region()

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Zero out the entire mem explicitly before it's used, to ensure the unused
feilds (pad1, pad2) are all zeros. Otherwise, it might cause problem when
the pad fields are extended by future KVM.

Fixes: ce5a983233 ("kvm: Enable KVM_SET_USER_MEMORY_REGION2 for memslot")
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/r/20250728115707.1374614-3-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2025-07-28 19:57:06 +08:00 • committed by Paolo Bonzini
parent 706cc70865
commit 80030f66ad
1 changed files with 1 additions and 1 deletions
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2
accel/kvm/kvm-all.c
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@ -358,7 +358,7 @@ int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot, bool new)
{
KVMState *s = kvm_state;
struct kvm_userspace_memory_region2 mem;
struct kvm_userspace_memory_region2 mem = {};
int ret;
mem.slot = slot->slot | (kml->as_id << 16);