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KVM: arm64: PMU: Restore the host's PMUSERENR_EL0

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Restore the host's PMUSERENR_EL0 value instead of clearing it,
before returning back to userspace, as the host's EL0 might have
a direct access to PMU registers (some bits of PMUSERENR_EL0 for
might not be zero for the host EL0).

Fixes: 83a7a4d643 ("arm64: perf: Enable PMU counter userspace access for perf event")
Signed-off-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230603025035.3781797-2-reijiw@google.com
This commit is contained in:
Reiji Watanabe 2023-06-02 19:50:34 -07:00 committed by Marc Zyngier
parent 40e54cad45
commit 8681f71759
1 changed files with 11 additions and 2 deletions
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13
arch/arm64/kvm/hyp/include/hyp/switch.h
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@ -82,7 +82,12 @@ static inline void __activate_traps_common(struct kvm_vcpu *vcpu)
* EL1 instead of being trapped to EL2.
*/
if (kvm_arm_support_pmu_v3()) {
struct kvm_cpu_context *hctxt;
write_sysreg(0, pmselr_el0);
hctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
ctxt_sys_reg(hctxt, PMUSERENR_EL0) = read_sysreg(pmuserenr_el0);
write_sysreg(ARMV8_PMU_USERENR_MASK, pmuserenr_el0);
}
@ -106,8 +111,12 @@ static inline void __deactivate_traps_common(struct kvm_vcpu *vcpu)
write_sysreg(vcpu->arch.mdcr_el2_host, mdcr_el2);
write_sysreg(0, hstr_el2);
if (kvm_arm_support_pmu_v3())
write_sysreg(0, pmuserenr_el0);
if (kvm_arm_support_pmu_v3()) {
struct kvm_cpu_context *hctxt;
hctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
write_sysreg(ctxt_sys_reg(hctxt, PMUSERENR_EL0), pmuserenr_el0);
}
if (cpus_have_final_cap(ARM64_SME)) {
sysreg_clear_set_s(SYS_HFGRTR_EL2, 0,