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KVM: x86/mmu: Stop kicking vCPUs to sync the dirty log when PML is disabled

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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 a018eba538 ("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: a018eba538 ("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>
This commit is contained in:
David Matlack
2023-10-16 15:12:28 -07:00
committed by Sean Christopherson
parent 26951ec862
commit 3d30bfcbdc
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/x86.c
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@@ -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);
}