Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

arm64: KVM: pmu: Fix AArch32 cycle counter access

Browse source 
We're missing the handling code for the cycle counter accessed
from a 32bit guest, leading to unexpected results.

Cc: stable@vger.kernel.org # 4.6+
Signed-off-by: Wei Huang <wei@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Wei Huang 2016-11-16 09:20:57 +00:00 committed by Marc Zyngier
parent d42c79701a
commit 9e3f7a2969
1 changed files with 8 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
arch/arm64/kvm/sys_regs.c
View file

@ -597,8 +597,14 @@ static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
idx = ARMV8_PMU_CYCLE_IDX;
} else {
BUG();
return false;
}
} else if (r->CRn == 0 && r->CRm == 9) {
/* PMCCNTR */
if (pmu_access_event_counter_el0_disabled(vcpu))
return false;
idx = ARMV8_PMU_CYCLE_IDX;
} else if (r->CRn == 14 && (r->CRm & 12) == 8) {
/* PMEVCNTRn_EL0 */
if (pmu_access_event_counter_el0_disabled(vcpu))
@ -606,7 +612,7 @@ static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
} else {
BUG();
return false;
}
if (!pmu_counter_idx_valid(vcpu, idx))