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[v4,11/18] KVM: arm64: nv: Advertise support for FEAT_HPMN0

Message ID 20241025182354.3364124-12-oliver.upton@linux.dev (mailing list archive)
State New
Headers show
Series KVM: arm64: nv: Support for EL2 PMU controls | expand

Commit Message

Oliver Upton Oct. 25, 2024, 6:23 p.m. UTC 
Everything is in place now for KVM to actually handle MDCR_EL2.HPMN. Not
only that, the emulation is capable of doing FEAT_HPMN0. Advertise
support for the feature in the VM's ID registers. It is possible to
emulate FEAT_HPMN0 on hardware that doesn't support it since KVM
currently traps all PMU registers. Having said that, let's only
advertise the feature on supporting hardware in case KVM ever provides
'direct' PMU support to VMs w/o involving host perf.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 arch/arm64/kvm/nested.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index d256a495a6ba..762f3ea8126d 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -892,12 +892,13 @@  static void limit_nv_id_regs(struct kvm *kvm)
 				  ID_AA64MMFR4_EL1_E2H0_NI_NV1);
 	kvm_set_vm_id_reg(kvm, SYS_ID_AA64MMFR4_EL1, val);
 
-	/* Only limited support for PMU, Debug, BPs and WPs */
+	/* Only limited support for PMU, Debug, BPs, WPs, and HPMN0 */
 	val = kvm_read_vm_id_reg(kvm, SYS_ID_AA64DFR0_EL1);
 	val &= (NV_FTR(DFR0, PMUVer)	|
 		NV_FTR(DFR0, WRPs)	|
 		NV_FTR(DFR0, BRPs)	|
-		NV_FTR(DFR0, DebugVer));
+		NV_FTR(DFR0, DebugVer)	|
+		NV_FTR(DFR0, HPMN0));
 
 	/* Cap Debug to ARMv8.1 */
 	tmp = FIELD_GET(NV_FTR(DFR0, DebugVer), val);