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On 3/26/19 10:57 AM, Suthikulpanit, Suravee wrote:
> Only clear the valid bit when invalidate logical APIC id entry.
> The current logic clear the valid bit, but also set the rest of
> the bits (including reserved bits) to 1.
>
> Fixes: 98d90582be2e ('svm: Fix AVIC DFR and LDR handling')
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
> ---
> arch/x86/kvm/svm.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index 7a4ce1a22ca0..8a123bd0f591 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -270,6 +270,7 @@ struct amd_svm_iommu_ir {
> };
>
> #define AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK (0xFF)
> +#define AVIC_LOGICAL_ID_ENTRY_VALID_BIT 31
> #define AVIC_LOGICAL_ID_ENTRY_VALID_MASK (1 << 31)
>
> #define AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK (0xFFULL)
> @@ -4640,7 +4641,7 @@ static void avic_invalidate_logical_id_entry(struct kvm_vcpu *vcpu)
> u32 *entry = avic_get_logical_id_entry(vcpu, svm->ldr_reg, flat);
>
> if (entry)
> - WRITE_ONCE(*entry, (u32) ~AVIC_LOGICAL_ID_ENTRY_VALID_MASK);
> + clear_bit(AVIC_LOGICAL_ID_ENTRY_VALID_BIT, (unsigned long *)entry);
> }
>
> static int avic_handle_ldr_update(struct kvm_vcpu *vcpu)
>
