Il 18/08/2014 23:03, Nadav Amit ha scritto:
> Currently, recalculate_apic_map ignores vcpus whose lapic is software disabled
> through the spurious interrupt vector. However, once it is re-enabled, the map
> is not recalculated. Therefore, if the guest OS configured DFR while lapic is
> software-disabled, the map may be incorrect. This patch recalculates apic map
> after software enabling the lapic.
>
> Signed-off-by: Nadav Amit <na...@cs.technion.ac.il>
> ---
> arch/x86/kvm/lapic.c | 25 ++++++++++++++-----------
> 1 file changed, 14 insertions(+), 11 deletions(-)
>
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 08e8a89..4a736199 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -112,17 +112,6 @@ static inline int __apic_test_and_clear_vector(int vec,
> void *bitmap)
> struct static_key_deferred apic_hw_disabled __read_mostly;
> struct static_key_deferred apic_sw_disabled __read_mostly;
>
> -static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
> -{
> - if ((kvm_apic_get_reg(apic, APIC_SPIV) ^ val) & APIC_SPIV_APIC_ENABLED)
> {
> - if (val & APIC_SPIV_APIC_ENABLED)
> - static_key_slow_dec_deferred(&apic_sw_disabled);
> - else
> - static_key_slow_inc(&apic_sw_disabled.key);
> - }
> - apic_set_reg(apic, APIC_SPIV, val);
> -}
> -
> static inline int apic_enabled(struct kvm_lapic *apic)
> {
> return kvm_apic_sw_enabled(apic) && kvm_apic_hw_enabled(apic);
> @@ -210,6 +199,20 @@ out:
> kvm_vcpu_request_scan_ioapic(kvm);
> }
>
> +static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
> +{
> + u32 prev = kvm_apic_get_reg(apic, APIC_SPIV);
> +
> + apic_set_reg(apic, APIC_SPIV, val);
> + if ((prev ^ val) & APIC_SPIV_APIC_ENABLED) {
> + if (val & APIC_SPIV_APIC_ENABLED) {
> + static_key_slow_dec_deferred(&apic_sw_disabled);
> + recalculate_apic_map(apic->vcpu->kvm);
> + } else
> + static_key_slow_inc(&apic_sw_disabled.key);
> + }
> +}
> +
> static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id)
> {
> apic_set_reg(apic, APIC_ID, id << 24);
>
Applied to kvm/queue, thanks.
Paolo
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