diff options
| author | Will Deacon | 2021-06-08 19:02:56 +0100 |
|---|---|---|
| committer | Will Deacon | 2021-06-11 13:25:40 +0100 |
| commit | 2f6a49bbc01da17867c26f6f650b1142e1d7c69d (patch) | |
| tree | ef07c18ded45928e371f4e0d2472d6fa6d2e7f40 | |
| parent | 2122a833316f2f3f6ddc78429fa67ef6d3c86636 (diff) | |
KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support
If a vCPU is caught running 32-bit code on a system with mismatched
support at EL0, then we should kill it.
Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210608180313.11502-4-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | arch/arm64/kvm/arm.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 1cb39c0803a4..5bdba97a7654 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -692,6 +692,15 @@ static void check_vcpu_requests(struct kvm_vcpu *vcpu) } } +static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu) +{ + if (likely(!vcpu_mode_is_32bit(vcpu))) + return false; + + return !system_supports_32bit_el0() || + static_branch_unlikely(&arm64_mismatched_32bit_el0); +} + /** * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code * @vcpu: The VCPU pointer @@ -875,7 +884,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) * with the asymmetric AArch32 case), return to userspace with * a fatal error. */ - if (!system_supports_32bit_el0() && vcpu_mode_is_32bit(vcpu)) { + if (vcpu_mode_is_bad_32bit(vcpu)) { /* * As we have caught the guest red-handed, decide that * it isn't fit for purpose anymore by making the vcpu |