From 583cda1b0e7d5d49db5fc15db623166310e36bf6 Mon Sep 17 00:00:00 2001 From: Alexandru Elisei Date: Thu, 27 Jan 2022 16:17:59 +0000 Subject: KVM: arm64: Refuse to run VCPU if the PMU doesn't match the physical CPU Userspace can assign a PMU to a VCPU with the KVM_ARM_VCPU_PMU_V3_SET_PMU device ioctl. If the VCPU is scheduled on a physical CPU which has a different PMU, the perf events needed to emulate a guest PMU won't be scheduled in and the guest performance counters will stop counting. Treat it as an userspace error and refuse to run the VCPU in this situation. Suggested-by: Marc Zyngier Signed-off-by: Alexandru Elisei Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220127161759.53553-7-alexandru.elisei@arm.com --- arch/arm64/include/uapi/asm/kvm.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/arm64/include/uapi/asm/kvm.h') diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 1d0a0a2a9711..d49f714f48e6 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -414,6 +414,9 @@ struct kvm_arm_copy_mte_tags { #define KVM_PSCI_RET_INVAL PSCI_RET_INVALID_PARAMS #define KVM_PSCI_RET_DENIED PSCI_RET_DENIED +/* run->fail_entry.hardware_entry_failure_reason codes. */ +#define KVM_EXIT_FAIL_ENTRY_CPU_UNSUPPORTED (1ULL << 0) + #endif #endif /* __ARM_KVM_H__ */ -- cgit