On Fri, Jan 26, 2024, Xiong Zhang wrote:
> From: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
>
> On PMU passthrough mode, guest virtual LVTPC_MASK bit must be reflected
> onto HW, especially when guest clear it, the HW bit should be cleared also.
> Otherwise processor can't generate PMI until the HW mask bit is cleared.
>
> This commit add a function to get virtual LVTPC_MASK bit, so that
No "This commit", "This patch", or any other variation. Please read through:
Documentation/process/maintainer-tip.rst
Documentation/process/maintainer-kvm-x86.rst
> it can be set onto HW later.
>
> Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
> ---
> arch/x86/kvm/lapic.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
> index e30641d5ac90..dafae44325d1 100644
> --- a/arch/x86/kvm/lapic.h
> +++ b/arch/x86/kvm/lapic.h
> @@ -277,4 +277,10 @@ static inline u8 kvm_xapic_id(struct kvm_lapic *apic)
> {
> return kvm_lapic_get_reg(apic, APIC_ID) >> 24;
> }
> +
> +static inline bool kvm_lapic_get_lvtpc_mask(struct kvm_vcpu *vcpu)
> +{
> + return lapic_in_kernel(vcpu) &&
> + (kvm_lapic_get_reg(vcpu->arch.apic, APIC_LVTPC) & APIC_LVT_MASKED);
> +}
As suggested in the previous patch, I'm pretty sure we can safely omit this
helper.
> #endif
> --
> 2.34.1
>
