From: Li RongQing <lirongqing@xxxxxxxxx> Intel VMX APICv accelerates EOI write and does not trap. This causes in-kernel PIT re-injection mode to fail since it relies on irq-ack notifier mechanism. So, APICv is activated only when in-kernel PIT is in discard mode e.g. w/ qemu option: -global kvm-pit.lost_tick_policy=discard Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx> --- arch/x86/kvm/vmx/vmx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index fe5615f..16952a9 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -8051,7 +8051,8 @@ static bool vmx_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason) BIT(APICV_INHIBIT_REASON_HYPERV) | BIT(APICV_INHIBIT_REASON_BLOCKIRQ) | BIT(APICV_INHIBIT_REASON_APIC_ID_MODIFIED) | - BIT(APICV_INHIBIT_REASON_APIC_BASE_MODIFIED); + BIT(APICV_INHIBIT_REASON_APIC_BASE_MODIFIED) | + BIT(APICV_INHIBIT_REASON_PIT_REINJ); return supported & BIT(reason); } -- 2.9.4
