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KVM: arm64: PMU: Disallow vPMU on non-uniform PMUVer

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Disallow userspace from configuring vPMU for guests on systems
where the PMUVer is not uniform across all PEs.
KVM has not been advertising PMUv3 to the guests with vPMU on
such systems anyway, and such systems would be extremely
uncommon and unlikely to even use KVM.

Signed-off-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230819043947.4100985-2-reijiw@google.com
This commit is contained in:
Reiji Watanabe
2023-08-18 21:39:44 -07:00
committed by Marc Zyngier
parent 6eaae19807
commit ec3eb9ed60
1 changed files with 6 additions and 2 deletions
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8
arch/arm64/kvm/pmu-emul.c
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@@ -14,6 +14,7 @@
#include <asm/kvm_emulate.h>
#include <kvm/arm_pmu.h>
#include <kvm/arm_vgic.h>
#include <asm/arm_pmuv3.h>
#define PERF_ATTR_CFG1_COUNTER_64BIT BIT(0)
@@ -672,8 +673,11 @@ void kvm_host_pmu_init(struct arm_pmu *pmu)
{
struct arm_pmu_entry *entry;
if (pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_NI ||
pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF)
/*
* Check the sanitised PMU version for the system, as KVM does not
* support implementations where PMUv3 exists on a subset of CPUs.
*/
if (!pmuv3_implemented(kvm_arm_pmu_get_pmuver_limit()))
return;
mutex_lock(&arm_pmus_lock);