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KVM: arm64: Restore POR_EL0 access to host EL0

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CPTR_EL2.E0POE was being cleared in __deactivate_cptr_traps_vhe(), which meant
that any accesses to POR_EL0 from host EL0 would trap and be reported to
userspace as an Illegal instruction. This would happen after running any VM,
regardless if it used POE or not.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Link: https://sashiko.dev/#/patchset/20260602155430.2088142-1-maz@kernel.org?part=1
Link: https://patch.msgid.link/20260604105434.2297268-1-joey.gouly@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger,kernel.org
This commit is contained in:
Joey Gouly 2026-06-04 11:54:34 +01:00 • committed by Marc Zyngier
commit cbaffe843a
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kvm/hyp/include/hyp/switch.h
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@ -181,6 +181,8 @@ static inline void __deactivate_cptr_traps_vhe(struct kvm_vcpu *vcpu)
val |= CPACR_EL1_ZEN;
if (cpus_have_final_cap(ARM64_SME))
val |= CPACR_EL1_SMEN;
if (cpus_have_final_cap(ARM64_HAS_S1POE))
val |= CPACR_EL1_E0POE;
write_sysreg(val, cpacr_el1);
}