[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[RFC PATCH 4/5] target/arm: enable feature ARM_FEATURE_EL2 if EL2 is sup
From: |
Miguel Luis |
Subject: |
[RFC PATCH 4/5] target/arm: enable feature ARM_FEATURE_EL2 if EL2 is supported |
Date: |
Mon, 27 Feb 2023 15:37:17 -0100 |
From: Haibo Xu <haibo.xu@linaro.org>
KVM_CAP_ARM_EL2 must be supported by the cpu to enable ARM_FEATURE_EL2.
EL2 bits on ID_AA64PFR0 state unsupported on the value 0b0000.
Ref:
https://lore.kernel.org/qemu-devel/b7c2626e6c720ccc43e57197dff3dac72d613640.1616052890.git.haibo.xu@linaro.org/
Signed-off-by: Haibo Xu <haibo.xu@linaro.org>
[Miguel Luis: use of ID_AA64PFR0 for cpu features]
Signed-off-by: Miguel Luis <miguel.luis@oracle.com>
---
target/arm/cpu.h | 2 +-
target/arm/kvm64.c | 16 ++++++++++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 9aeed3c848..de2a88b43e 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -3961,7 +3961,7 @@ static inline bool isar_feature_aa64_aa32_el1(const
ARMISARegisters *id)
static inline bool isar_feature_aa64_aa32_el2(const ARMISARegisters *id)
{
- return FIELD_EX64(id->id_aa64pfr0, ID_AA64PFR0, EL2) >= 2;
+ return FIELD_EX64(id->id_aa64pfr0, ID_AA64PFR0, EL2) != 0;
}
static inline bool isar_feature_aa64_ras(const ARMISARegisters *id)
diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
index be8144a2b5..f7ebd731aa 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -505,6 +505,7 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
*/
int fdarray[3];
bool sve_supported;
+ bool el2_supported;
bool pmu_supported = false;
uint64_t features = 0;
int err;
@@ -535,6 +536,14 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures
*ahcf)
init.features[0] |= 1 << KVM_ARM_VCPU_SVE;
}
+ /*
+ * Ask for EL2 if supported.
+ */
+ el2_supported = kvm_arm_el2_supported();
+ if (el2_supported) {
+ init.features[0] |= 1 << KVM_ARM_VCPU_HAS_EL2;
+ }
+
/*
* Ask for Pointer Authentication if supported, so that we get
* the unsanitized field values for AA64ISAR1_EL1.
@@ -714,6 +723,10 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures
*ahcf)
features |= 1ULL << ARM_FEATURE_PMU;
features |= 1ULL << ARM_FEATURE_GENERIC_TIMER;
+ if (el2_supported) {
+ features |= 1ULL << ARM_FEATURE_EL2;
+ }
+
ahcf->features = features;
return true;
@@ -881,6 +894,9 @@ int kvm_arch_init_vcpu(CPUState *cs)
assert(kvm_arm_sve_supported());
cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_SVE;
}
+ if (cpu_isar_feature(aa64_aa32_el2, cpu)) {
+ cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_HAS_EL2;
+ }
if (cpu_isar_feature(aa64_pauth, cpu)) {
cpu->kvm_init_features[0] |= (1 << KVM_ARM_VCPU_PTRAUTH_ADDRESS |
1 << KVM_ARM_VCPU_PTRAUTH_GENERIC);
--
2.39.2
- [RFC PATCH 0/5] QEMU v7.2.0 aarch64 Nested Virtualization Support, Miguel Luis, 2023/02/27
- [RFC PATCH 1/5] linux-headers: [kvm, arm64] add the necessary definitions to match host kernel, Miguel Luis, 2023/02/27
- [RFC PATCH 2/5] hw/intc/gicv3: add support for setting KVM vGIC maintenance IRQ, Miguel Luis, 2023/02/27
- [RFC PATCH 3/5] target/arm/kvm: add helper to detect EL2 when using KVM, Miguel Luis, 2023/02/27
- [RFC PATCH 4/5] target/arm: enable feature ARM_FEATURE_EL2 if EL2 is supported,
Miguel Luis <=
- [RFC PATCH 5/5] arm/virt: provide virtualization extensions to the guest, Miguel Luis, 2023/02/27