linux-kernel - [PATCH v4 11/18] KVM: arm64: nv: Advertise support for FEAT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241025182354.3364124-12-oliver.upton@linux.dev>
Date: Fri, 25 Oct 2024 18:23:46 +0000
From: Oliver Upton <oliver.upton@...ux.dev>
To: kvmarm@...ts.linux.dev
Cc: Marc Zyngier <maz@...nel.org>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Anshuman Khandual <anshuman.khandual@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Oliver Upton <oliver.upton@...ux.dev>
Subject: [PATCH v4 11/18] KVM: arm64: nv: Advertise support for FEAT_HPMN0

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@...ux.dev>
---
 arch/arm64/kvm/nested.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

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);
-- 
2.47.0.163.g1226f6d8fa-goog