diff options
| author | Marc Zyngier <maz@kernel.org> | 2023-08-15 19:39:02 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2023-08-17 10:00:28 +0100 |
| commit | 03fb54d0aa73cc14e51f6611eb3289e4fec15184 (patch) | |
| tree | 93f719da7b0cc9fdcc8cc15fa90d56b1d10ee825 /arch/arm64/kvm/hyp/include/hyp/switch.h | |
| parent | a63cf31139b7f41d468dc8ef63dbf6bae213d960 (diff) | |
KVM: arm64: nv: Add support for HCRX_EL2
HCRX_EL2 has an interesting effect on HFGITR_EL2, as it conditions
the traps of TLBI*nXS.
Expand the FGT support to add a new Fine Grained Filter that will
get checked when the instruction gets trapped, allowing the shadow
register to override the trap as needed.
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Jing Zhang <jingzhangos@google.com>
Link: https://lore.kernel.org/r/20230815183903.2735724-29-maz@kernel.org
Diffstat (limited to 'arch/arm64/kvm/hyp/include/hyp/switch.h')
| -rw-r--r-- | arch/arm64/kvm/hyp/include/hyp/switch.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index 060c5a0409e5..3acf6d77e324 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -197,8 +197,19 @@ static inline void __activate_traps_common(struct kvm_vcpu *vcpu) vcpu->arch.mdcr_el2_host = read_sysreg(mdcr_el2); write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2); - if (cpus_have_final_cap(ARM64_HAS_HCX)) - write_sysreg_s(HCRX_GUEST_FLAGS, SYS_HCRX_EL2); + if (cpus_have_final_cap(ARM64_HAS_HCX)) { + u64 hcrx = HCRX_GUEST_FLAGS; + if (vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu)) { + u64 clr = 0, set = 0; + + compute_clr_set(vcpu, HCRX_EL2, clr, set); + + hcrx |= set; + hcrx &= ~clr; + } + + write_sysreg_s(hcrx, SYS_HCRX_EL2); + } __activate_traps_hfgxtr(vcpu); } |