On Wed, May 01, 2019 at 05:10:08PM +0100, Kristina Martsenko wrote:
> When a VCPU doesn't have pointer auth, we want to hide all four pointer
> auth ID register fields from the guest, not just one of them.
>
> Fixes: 384b40caa8af ("KVM: arm/arm64: Context-switch ptrauth registers")
> Reported-by: Andrew Murray <andrew.murray@xxxxxxx>
> Fsck-up-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Past tense is "fscked" ;)
With that:
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Will
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 9d02643bc601..857b226bcdde 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -1088,10 +1088,10 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
> if (id == SYS_ID_AA64PFR0_EL1 && !vcpu_has_sve(vcpu)) {
> val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
> } else if (id == SYS_ID_AA64ISAR1_EL1 && !vcpu_has_ptrauth(vcpu)) {
> - val &= ~(0xfUL << ID_AA64ISAR1_APA_SHIFT) |
> - (0xfUL << ID_AA64ISAR1_API_SHIFT) |
> - (0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
> - (0xfUL << ID_AA64ISAR1_GPI_SHIFT);
> + val &= ~((0xfUL << ID_AA64ISAR1_APA_SHIFT) |
> + (0xfUL << ID_AA64ISAR1_API_SHIFT) |
> + (0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
> + (0xfUL << ID_AA64ISAR1_GPI_SHIFT));
> }
>
> return val;
> --
> 2.11.0
>
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