diff mbox series

[v5,03/69] KVM: arm64: Add minimal handling for the ARMv8.7 PMU

Message ID 20211129200150.351436-4-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: ARMv8.3/8.4 Nested Virtualization support | expand

Commit Message

Marc Zyngier Nov. 29, 2021, 8 p.m. UTC 
When running a KVM guest hosted on an ARMv8.7 machine, the host
kernel complains that it doesn't know about the architected number
of events.

Fix it by adding the PMUver code corresponding to PMUv3 for ARMv8.7.

Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Tested-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211126115533.217903-1-maz@kernel.org
---
 arch/arm64/include/asm/sysreg.h | 1 +
 arch/arm64/kvm/pmu-emul.c       | 1 +
 2 files changed, 2 insertions(+)

Comments

Russell King (Oracle) Jan. 17, 2022, 3:40 p.m. UTC | #1 
On Mon, Nov 29, 2021 at 08:00:44PM +0000, Marc Zyngier wrote:
> When running a KVM guest hosted on an ARMv8.7 machine, the host
> kernel complains that it doesn't know about the architected number
> of events.
> 
> Fix it by adding the PMUver code corresponding to PMUv3 for ARMv8.7.
> 
> Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
> Tested-by: Alexandru Elisei <alexandru.elisei@arm.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> Link: https://lore.kernel.org/r/20211126115533.217903-1-maz@kernel.org

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 16b3f1a1d468..615dd6278f8b 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -937,6 +937,7 @@ 
 #define ID_AA64DFR0_PMUVER_8_1		0x4
 #define ID_AA64DFR0_PMUVER_8_4		0x5
 #define ID_AA64DFR0_PMUVER_8_5		0x6
+#define ID_AA64DFR0_PMUVER_8_7		0x7
 #define ID_AA64DFR0_PMUVER_IMP_DEF	0xf
 
 #define ID_AA64DFR0_PMSVER_8_2		0x1
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index a5e4bbf5e68f..ca92cc5c71c6 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -28,6 +28,7 @@  static u32 kvm_pmu_event_mask(struct kvm *kvm)
 	case ID_AA64DFR0_PMUVER_8_1:
 	case ID_AA64DFR0_PMUVER_8_4:
 	case ID_AA64DFR0_PMUVER_8_5:
+	case ID_AA64DFR0_PMUVER_8_7:
 		return GENMASK(15, 0);
 	default:		/* Shouldn't be here, just for sanity */
 		WARN_ONCE(1, "Unknown PMU version %d\n", kvm->arch.pmuver);