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authorAndrew Jones <drjones@redhat.com>2017-07-01 18:26:54 +0200
committerMarc Zyngier <marc.zyngier@arm.com>2017-07-25 14:18:01 +0100
commitd9f89b4e9290e46cd9b273e9ad0bff0f93e86fae (patch)
tree94f2f88610beefb87a9995c91a9452a867990d3a /arch/arm64/kvm
parentKVM: arm/arm64: Fix bug in advertising KVM_CAP_MSI_DEVID capability (diff)
downloadlinux-dev-d9f89b4e9290e46cd9b273e9ad0bff0f93e86fae.tar.xz
linux-dev-d9f89b4e9290e46cd9b273e9ad0bff0f93e86fae.zip
KVM: arm/arm64: PMU: Fix overflow interrupt injection
kvm_pmu_overflow_set() is called from perf's interrupt handler, making the call of kvm_vgic_inject_irq() from it introduced with "KVM: arm/arm64: PMU: remove request-less vcpu kick" a really bad idea, as it's quite easy to try and retake a lock that the interrupted context is already holding. The fix is to use a vcpu kick, leaving the interrupt injection to kvm_pmu_sync_hwstate(), like it was doing before the refactoring. We don't just revert, though, because before the kick was request-less, leaving the vcpu exposed to the request-less vcpu kick race, and also because the kick was used unnecessarily from register access handlers. Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/kvm')
-rw-r--r--arch/arm64/kvm/sys_regs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 77862881ae86..2e070d3baf9f 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -764,7 +764,7 @@ static bool access_pmovs(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
if (p->is_write) {
if (r->CRm & 0x2)
/* accessing PMOVSSET_EL0 */
- kvm_pmu_overflow_set(vcpu, p->regval & mask);
+ vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= (p->regval & mask);
else
/* accessing PMOVSCLR_EL0 */
vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~(p->regval & mask);