On Wed, May 01, 2019 at 05:20:49PM +0100, Marc Zyngier wrote:
> On 01/05/2019 17:10, 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>
> > Signed-off-by: Kristina Martsenko <kristina.martsenko@xxxxxxx>
> > ---
> > arch/arm64/kvm/sys_regs.c | 8 ++++----
> > 1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > 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;
> >
>
> Applied and pushed to -next. Thanks Andrew for reporting it, and
> Kristina for putting me right!
I was worried this was my mistake... but it looks like my original
suggstion did have the extra ().
Anyway, FWIW,
Acked-by: Dave Martin <Dave.Martin@xxxxxxx>
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