[PATCH v2 11/18] KVM: arm64: don't trap Statistical Profiling controls to EL2

Andrew Murray
2019-12-20T14:32:20Z

As we now save/restore the profiler state there is no need to trap
accesses to the statistical profiling controls. Let's unset the
_TPMS bit.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
---
arch/arm64/kvm/debug.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c
index 43487f035385..07ca783e7d9e 100644
--- a/arch/arm64/kvm/debug.c
+++ b/arch/arm64/kvm/debug.c
@@ -88,7 +88,6 @@ void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu)
* - Performance monitors (MDCR_EL2_TPM/MDCR_EL2_TPMCR)
* - Debug ROM Address (MDCR_EL2_TDRA)
* - OS related registers (MDCR_EL2_TDOSA)
- * - Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB)
*
* Additionally, KVM only traps guest accesses to the debug registers if
* the guest is not actively using them (see the KVM_ARM64_DEBUG_DIRTY
@@ -111,7 +110,6 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu)
*/
vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK;
vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM |
- MDCR_EL2_TPMS |
MDCR_EL2_TPMCR |
MDCR_EL2_TDRA |
MDCR_EL2_TDOSA);
--
2.21.0