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SubjectRe: [PATCH 1/6] KVM: x86: Add callback functions for handling APIC ID, DFR and LDR update
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On 22/03/19 12:57, Suthikulpanit, Suravee wrote:
> Add hooks for handling the case when guest VM update APIC ID, DFR and LDR.
> This is needed during AMD AVIC is temporary deactivated.
>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>

Why not do this later when AVIC is reactivated, in
svm_refresh_apicv_exec_ctrl?

Thanks,

Paolo

> ---
> arch/x86/include/asm/kvm_host.h | 3 +++
> arch/x86/kvm/lapic.c | 6 ++++++
> 2 files changed, 9 insertions(+)
>
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index a5db4475e72d..1906e205e6a3 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1077,6 +1077,9 @@ struct kvm_x86_ops {
> void (*refresh_apicv_exec_ctrl)(struct kvm_vcpu *vcpu);
> void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
> void (*hwapic_isr_update)(struct kvm_vcpu *vcpu, int isr);
> + void (*hwapic_apic_id_update)(struct kvm_vcpu *vcpu);
> + void (*hwapic_dfr_update)(struct kvm_vcpu *vcpu);
> + void (*hwapic_ldr_update)(struct kvm_vcpu *vcpu);
> bool (*guest_apic_has_interrupt)(struct kvm_vcpu *vcpu);
> void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
> void (*set_virtual_apic_mode)(struct kvm_vcpu *vcpu);
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 991fdf7fc17f..95295cf81283 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -262,12 +262,16 @@ static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
> static inline void kvm_apic_set_xapic_id(struct kvm_lapic *apic, u8 id)
> {
> kvm_lapic_set_reg(apic, APIC_ID, id << 24);
> + if (kvm_x86_ops->hwapic_apic_id_update)
> + kvm_x86_ops->hwapic_apic_id_update(apic->vcpu);
> recalculate_apic_map(apic->vcpu->kvm);
> }
>
> static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
> {
> kvm_lapic_set_reg(apic, APIC_LDR, id);
> + if (kvm_x86_ops->hwapic_ldr_update)
> + kvm_x86_ops->hwapic_ldr_update(apic->vcpu);
> recalculate_apic_map(apic->vcpu->kvm);
> }
>
> @@ -1836,6 +1840,8 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
> case APIC_DFR:
> if (!apic_x2apic_mode(apic)) {
> kvm_lapic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
> + if (kvm_x86_ops->hwapic_dfr_update)
> + kvm_x86_ops->hwapic_dfr_update(apic->vcpu);
> recalculate_apic_map(apic->vcpu->kvm);
> } else
> ret = 1;
>

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