diff options
| author | Marc Zyngier <maz@kernel.org> | 2025-09-17 10:11:28 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2025-09-17 17:40:42 +0100 |
| commit | 9664d5810e9bc919a9a661594e01eabc80befe8a (patch) | |
| tree | 339b6e7de416b251bb1972a325be3dfa0d69dc4e /include | |
| parent | b320789d6883cc00ac78ce83bccbfe7ed58afcf0 (diff) | |
KVM: arm64: Don't access ICC_SRE_EL2 if GICv3 doesn't support v2 compatibility
We currently access ICC_SRE_EL2 at each load/put on VHE, and on each
entry/exit on nVHE. Both are quite onerous on NV, as this register
always traps.
We do this to make sure the EL1 guest doesn't flip between v2 and v3
behind our back. But all modern implementations have dropped v2,
and this is just overhead.
At the same time, the GICv5 spec has been fixed to allow access to
ICC_SRE_EL2 in legacy mode. Use this opportunity to replace the
GICv5 checks for v2 compat checks, with an ad-hoc static key.
Co-developed-by: Sascha Bischoff <sascha.bischoff@arm.com>
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/kvm/arm_vgic.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 404883c7af6e..9a6340d9c91e 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -375,6 +375,7 @@ struct vgic_cpu { extern struct static_key_false vgic_v2_cpuif_trap; extern struct static_key_false vgic_v3_cpuif_trap; +extern struct static_key_false vgic_v3_has_v2_compat; int kvm_set_legacy_vgic_v2_addr(struct kvm *kvm, struct kvm_arm_device_addr *dev_addr); void kvm_vgic_early_init(struct kvm *kvm); |