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| author | Marc Zyngier <maz@kernel.org> | 2024-12-17 14:23:18 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2025-01-02 19:19:10 +0000 |
| commit | d1e37a50e1d781201768c89314532f6ab87e5a42 (patch) | |
| tree | aef074a605fa5116e562dffef3bf794229f40ab5 /arch/arm64/kvm/nested.c | |
| parent | 479428cc3dc99bbe28954b62b053b22accbfd1fd (diff) | |
| download | lwn-d1e37a50e1d781201768c89314532f6ab87e5a42.tar.gz lwn-d1e37a50e1d781201768c89314532f6ab87e5a42.zip | |
KVM: arm64: nv: Sanitise CNTHCTL_EL2
Inject some sanity in CNTHCTL_EL2, ensuring that we don't handle
more than we advertise to the guest.
Acked-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20241217142321.763801-11-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'arch/arm64/kvm/nested.c')
| -rw-r--r-- | arch/arm64/kvm/nested.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index 9b36218b48de..9113c6025d6f 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -1271,6 +1271,21 @@ int kvm_init_nv_sysregs(struct kvm *kvm) res0 |= MDCR_EL2_EnSTEPOP; set_sysreg_masks(kvm, MDCR_EL2, res0, res1); + /* CNTHCTL_EL2 */ + res0 = GENMASK(63, 20); + res1 = 0; + if (!kvm_has_feat(kvm, ID_AA64PFR0_EL1, RME, IMP)) + res0 |= CNTHCTL_CNTPMASK | CNTHCTL_CNTVMASK; + if (!kvm_has_feat(kvm, ID_AA64MMFR0_EL1, ECV, CNTPOFF)) { + res0 |= CNTHCTL_ECV; + if (!kvm_has_feat(kvm, ID_AA64MMFR0_EL1, ECV, IMP)) + res0 |= (CNTHCTL_EL1TVT | CNTHCTL_EL1TVCT | + CNTHCTL_EL1NVPCT | CNTHCTL_EL1NVVCT); + } + if (!kvm_has_feat(kvm, ID_AA64MMFR1_EL1, VH, IMP)) + res0 |= GENMASK(11, 8); + set_sysreg_masks(kvm, CNTHCTL_EL2, res0, res1); + return 0; } |