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SubjectRe: [PATCH 1/2] KVM: LAPIC: Fix updating DFR missing apic map recalculation
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On 09/09/20 10:41, Wanpeng Li wrote:
> Any Reviewed-by for these two patches? :)
> On Wed, 19 Aug 2020 at 16:55, Wanpeng Li <kernellwp@gmail.com> wrote:
>>
>> From: Wanpeng Li <wanpengli@tencent.com>
>>
>> There is missing apic map recalculation after updating DFR, if it is
>> INIT RESET, in x2apic mode, local apic is software enabled before.
>> This patch fix it by introducing the function kvm_apic_set_dfr() to
>> be called in INIT RESET handling path.
>>
>> Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
>> ---
>> arch/x86/kvm/lapic.c | 15 ++++++++++-----
>> 1 file changed, 10 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
>> index 5ccbee7..248095a 100644
>> --- a/arch/x86/kvm/lapic.c
>> +++ b/arch/x86/kvm/lapic.c
>> @@ -310,6 +310,12 @@ static inline void kvm_apic_set_ldr(struct kvm_lapic *apic, u32 id)
>> atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);
>> }
>>
>> +static inline void kvm_apic_set_dfr(struct kvm_lapic *apic, u32 val)
>> +{
>> + kvm_lapic_set_reg(apic, APIC_DFR, val);
>> + atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);
>> +}
>> +
>> static inline u32 kvm_apic_calc_x2apic_ldr(u32 id)
>> {
>> return ((id >> 4) << 16) | (1 << (id & 0xf));
>> @@ -1984,10 +1990,9 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
>> break;
>>
>> case APIC_DFR:
>> - if (!apic_x2apic_mode(apic)) {
>> - kvm_lapic_set_reg(apic, APIC_DFR, val | 0x0FFFFFFF);
>> - atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY);
>> - } else
>> + if (!apic_x2apic_mode(apic))
>> + kvm_apic_set_dfr(apic, val | 0x0FFFFFFF);
>> + else
>> ret = 1;
>> break;
>>
>> @@ -2303,7 +2308,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
>> SET_APIC_DELIVERY_MODE(0, APIC_MODE_EXTINT));
>> apic_manage_nmi_watchdog(apic, kvm_lapic_get_reg(apic, APIC_LVT0));
>>
>> - kvm_lapic_set_reg(apic, APIC_DFR, 0xffffffffU);
>> + kvm_apic_set_dfr(apic, 0xffffffffU);
>> apic_set_spiv(apic, 0xff);
>> kvm_lapic_set_reg(apic, APIC_TASKPRI, 0);
>> if (!apic_x2apic_mode(apic))
>> --
>> 2.7.4
>>
>

Queued, thanks.

Paolo

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