ping, :)
On Wed, 19 Aug 2020 at 16:55, Wanpeng Li <kernellwp@xxxxxxxxx> wrote:
>
> From: Wanpeng Li <wanpengli@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxx>
> ---
> 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
>
