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| author | David Matlack <dmatlack@google.com> | 2023-10-16 15:12:28 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-10-17 13:54:52 -0700 |
| commit | 3d30bfcbdc268b41a7d9253a9cb3082281223b19 (patch) | |
| tree | 9c7ebba6e391b83505dacfbaf0036a6d1f4f9850 /arch/x86 | |
| parent | 26951ec8623e915823985e86d2c428213f110659 (diff) | |
| download | linux-stable-3d30bfcbdc268b41a7d9253a9cb3082281223b19.tar.gz linux-stable-3d30bfcbdc268b41a7d9253a9cb3082281223b19.tar.bz2 linux-stable-3d30bfcbdc268b41a7d9253a9cb3082281223b19.zip | |
KVM: x86/mmu: Stop kicking vCPUs to sync the dirty log when PML is disabled
Stop kicking vCPUs in kvm_arch_sync_dirty_log() when PML is disabled.
Kicking vCPUs when PML is disabled serves no purpose and could
negatively impact guest performance.
This restores KVM's behavior to prior to 5.12 commit a018eba53870 ("KVM:
x86: Move MMU's PML logic to common code"), which replaced a
static_call_cond(kvm_x86_flush_log_dirty) with unconditional calls to
kvm_vcpu_kick().
Fixes: a018eba53870 ("KVM: x86: Move MMU's PML logic to common code")
Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20231016221228.1348318-1-dmatlack@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/x86.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 94ccad95f7e0..051ca1978442 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6355,6 +6355,9 @@ void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) struct kvm_vcpu *vcpu; unsigned long i; + if (!kvm_x86_ops.cpu_dirty_log_size) + return; + kvm_for_each_vcpu(i, vcpu, kvm) kvm_vcpu_kick(vcpu); } |