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authorBibo Mao <maobibo@loongson.cn>2024-06-13 20:28:03 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2024-06-20 17:20:11 -0400
commit676f819c3e982db3695a371f336a05086585ea4f (patch)
tree0fbc0e6cfed74402610d4507c92f3f0429728bba /virt
parentc31745d2c508796a0996c88bf2e55f552d513f65 (diff)
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KVM: Discard zero mask with function kvm_dirty_ring_reset
Function kvm_reset_dirty_gfn may be called with parameters cur_slot / cur_offset / mask are all zero, it does not represent real dirty page. It is not necessary to clear dirty page in this condition. Also return value of macro __fls() is undefined if mask is zero which is called in funciton kvm_reset_dirty_gfn(). Here just return. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Message-ID: <20240613122803.1031511-1-maobibo@loongson.cn> [Move the conditional inside kvm_reset_dirty_gfn; suggested by Sean Christopherson. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/dirty_ring.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/virt/kvm/dirty_ring.c b/virt/kvm/dirty_ring.c
index 86d267db87bb..7bc74969a819 100644
--- a/virt/kvm/dirty_ring.c
+++ b/virt/kvm/dirty_ring.c
@@ -55,6 +55,9 @@ static void kvm_reset_dirty_gfn(struct kvm *kvm, u32 slot, u64 offset, u64 mask)
struct kvm_memory_slot *memslot;
int as_id, id;
+ if (!mask)
+ return;
+
as_id = slot >> 16;
id = (u16)slot;