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arm64: cpucaps: Add GICv5 Legacy vCPU interface (GCIE_LEGACY) capability

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Implement the GCIE_LEGACY capability as a system feature to be able to
check for support from KVM. The type is explicitly
ARM64_CPUCAP_EARLY_LOCAL_CPU_FEATURE, which means that the capability
is enabled early if all boot CPUs support it. Additionally, if this
capability is enabled during boot, it prevents late onlining of CPUs
that lack it, thereby avoiding potential mismatched configurations
which would break KVM.

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Sascha Bischoff 2025-08-28 10:59:42 +00:00 committed by Marc Zyngier
parent d5a012af34
commit 7847f51189
2 changed files with 16 additions and 0 deletions
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15
arch/arm64/kernel/cpufeature.c
View File

@ -2539,6 +2539,15 @@ test_has_mpam_hcr(const struct arm64_cpu_capabilities *entry, int scope)
return idr & MPAMIDR_EL1_HAS_HCR;
}
static bool
test_has_gicv5_legacy(const struct arm64_cpu_capabilities *entry, int scope)
{
if (!this_cpu_has_cap(ARM64_HAS_GICV5_CPUIF))
return false;
return !!(read_sysreg_s(SYS_ICC_IDR0_EL1) & ICC_IDR0_EL1_GCIE_LEGACY);
}
static const struct arm64_cpu_capabilities arm64_features[] = {
{
.capability = ARM64_ALWAYS_BOOT,
@ -3156,6 +3165,12 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.matches = has_cpuid_feature,
ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, GCIE, IMP)
},
{
.desc = "GICv5 Legacy vCPU interface",
.type = ARM64_CPUCAP_EARLY_LOCAL_CPU_FEATURE,
.capability = ARM64_HAS_GICV5_LEGACY,
.matches = test_has_gicv5_legacy,
},
{},
};

1
arch/arm64/tools/cpucaps
View File

@ -37,6 +37,7 @@ HAS_GENERIC_AUTH_ARCH_QARMA5
HAS_GENERIC_AUTH_IMP_DEF
HAS_GICV3_CPUIF
HAS_GICV5_CPUIF
HAS_GICV5_LEGACY
HAS_GIC_PRIO_MASKING
HAS_GIC_PRIO_RELAXED_SYNC
HAS_HCR_NV1