From: Oliver Upton <oupton@google.com>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Marc Zyngier <maz@kernel.org>, Peter Shier <pshier@google.com>,
Jim Mattson <jmattson@google.com>,
David Matlack <dmatlack@google.com>,
Ricardo Koller <ricarkol@google.com>,
Jing Zhang <jingzhangos@google.com>,
Raghavendra Rao Anata <rananta@google.com>,
James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
linux-arm-kernel@lists.infradead.org,
Andrew Jones <drjones@redhat.com>, Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Oliver Upton <oupton@google.com>
Subject: [PATCH v8 5/8] arm64: cpufeature: Enumerate support for FEAT_ECV >= 0x2
Date: Thu, 16 Sep 2021 18:15:07 +0000 [thread overview]
Message-ID: <20210916181510.963449-6-oupton@google.com> (raw)
In-Reply-To: <20210916181510.963449-1-oupton@google.com>
Introduce a new cpucap to indicate if the system supports full enhanced
counter virtualization (i.e. ID_AA64MMFR0_EL1.ECV>=0x2).
Signed-off-by: Oliver Upton <oupton@google.com>
---
arch/arm64/include/asm/sysreg.h | 1 +
arch/arm64/kernel/cpufeature.c | 10 ++++++++++
arch/arm64/tools/cpucaps | 1 +
3 files changed, 12 insertions(+)
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index b268082d67ed..3fa6b091384d 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -849,6 +849,7 @@
#define ID_AA64MMFR0_ASID_8 0x0
#define ID_AA64MMFR0_ASID_16 0x2
+#define ID_AA64MMFR0_ECV_PHYS 0x2
#define ID_AA64MMFR0_TGRAN4_NI 0xf
#define ID_AA64MMFR0_TGRAN4_SUPPORTED_MIN 0x0
#define ID_AA64MMFR0_TGRAN4_SUPPORTED_MAX 0x7
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index f8a3067d10c6..2f5042bb107c 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2328,6 +2328,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.matches = has_cpuid_feature,
.min_field_value = 1,
},
+ {
+ .desc = "Enhanced Counter Virtualization (Physical)",
+ .capability = ARM64_HAS_ECV2,
+ .type = ARM64_CPUCAP_SYSTEM_FEATURE,
+ .sys_reg = SYS_ID_AA64MMFR0_EL1,
+ .sign = FTR_UNSIGNED,
+ .field_pos = ID_AA64MMFR0_ECV_SHIFT,
+ .matches = has_cpuid_feature,
+ .min_field_value = ID_AA64MMFR0_ECV_PHYS,
+ },
{},
};
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 49305c2e6dfd..f73a30d5fb1c 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -18,6 +18,7 @@ HAS_CRC32
HAS_DCPODP
HAS_DCPOP
HAS_E0PD
+HAS_ECV2
HAS_EPAN
HAS_GENERIC_AUTH
HAS_GENERIC_AUTH_ARCH
--
2.33.0.309.g3052b89438-goog
next prev parent reply other threads:[~2021-09-16 18:56 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-16 18:15 [PATCH v8 0/8] KVM: arm64: Add idempotent controls to migrate guest counter Oliver Upton
2021-09-16 18:15 ` [PATCH v8 1/8] KVM: arm64: Refactor update_vtimer_cntvoff() Oliver Upton
2021-09-16 18:15 ` [PATCH v8 2/8] KVM: arm64: Separate guest/host counter offset values Oliver Upton
2021-09-22 4:37 ` Reiji Watanabe
2021-09-22 14:44 ` Sean Christopherson
2021-09-22 16:17 ` Alexandru Elisei
2021-09-16 18:15 ` [PATCH v8 3/8] KVM: arm64: Make a helper function to get nr of timer regs Oliver Upton
2021-10-05 6:30 ` Andrew Jones
2021-09-16 18:15 ` [PATCH v8 4/8] KVM: arm64: Allow userspace to configure a vCPU's virtual offset Oliver Upton
2021-09-16 18:15 ` Oliver Upton [this message]
2021-10-13 5:10 ` [PATCH v8 5/8] arm64: cpufeature: Enumerate support for FEAT_ECV >= 0x2 Reiji Watanabe
2021-09-16 18:15 ` [PATCH v8 6/8] KVM: arm64: Allow userspace to configure a guest's counter-timer offset Oliver Upton
2021-09-22 16:39 ` Reiji Watanabe
2021-09-24 7:20 ` Reiji Watanabe
2021-09-16 18:15 ` [PATCH v8 7/8] KVM: arm64: Configure timer traps in vcpu_load() for VHE Oliver Upton
2021-09-16 18:15 ` [PATCH v8 8/8] KVM: arm64: Emulate physical counter offsetting on non-ECV systems Oliver Upton
2021-09-22 15:27 ` [PATCH v8 0/8] KVM: arm64: Add idempotent controls to migrate guest counter Alexandru Elisei
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