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| author | Marc Zyngier <maz@kernel.org> | 2024-01-22 19:13:42 +0100 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2024-02-08 16:12:45 +0100 |
| commit | c21df6e43f0ed51903738ee34cdb2ec2f978024d (patch) | |
| tree | f285dbf59f74f014fed3748eadbd79f06acbd7c8 /arch/arm64/kvm/nested.c | |
| parent | arm64: Treat HCR_EL2.E2H as RES1 when ID_AA64MMFR4_EL1.E2H0 is negative (diff) | |
| download | linux-c21df6e43f0ed51903738ee34cdb2ec2f978024d.tar.xz linux-c21df6e43f0ed51903738ee34cdb2ec2f978024d.zip | |
KVM: arm64: Expose ID_AA64MMFR4_EL1 to guests
We can now expose ID_AA64MMFR4_EL1 to guests, and let NV guests
understand that they cannot really switch HCR_EL2.E2H to 0 on
some platforms.
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240122181344.258974-9-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/kvm/nested.c')
| -rw-r--r-- | arch/arm64/kvm/nested.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index ba95d044bc98..d55e809e26cb 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -133,6 +133,13 @@ static u64 limit_nv_id_reg(u32 id, u64 val) val |= FIELD_PREP(NV_FTR(MMFR2, TTL), 0b0001); break; + case SYS_ID_AA64MMFR4_EL1: + val = 0; + if (!cpus_have_final_cap(ARM64_HAS_HCR_NV1)) + val |= FIELD_PREP(NV_FTR(MMFR4, E2H0), + ID_AA64MMFR4_EL1_E2H0_NI_NV1); + break; + case SYS_ID_AA64DFR0_EL1: /* Only limited support for PMU, Debug, BPs and WPs */ val &= (NV_FTR(DFR0, PMUVer) | |