diff options
| author | Marc Zyngier <maz@kernel.org> | 2020-06-09 08:50:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-17 16:40:38 +0200 |
| commit | 812857678847423d44b18bdb68522f9c2e9c3dc9 (patch) | |
| tree | 160e65a5092de38fe4733f95d57ec356fc564818 /arch/arm/include | |
| parent | 85831981aa0ed93d01342d06cea83ef45e184da5 (diff) | |
KVM: arm64: Synchronize sysreg state on injecting an AArch32 exception
commit 0370964dd3ff7d3d406f292cb443a927952cbd05 upstream.
On a VHE system, the EL1 state is left in the CPU most of the time,
and only syncronized back to memory when vcpu_put() is called (most
of the time on preemption).
Which means that when injecting an exception, we'd better have a way
to either:
(1) write directly to the EL1 sysregs
(2) synchronize the state back to memory, and do the changes there
For an AArch64, we already do (1), so we are safe. Unfortunately,
doing the same thing for AArch32 would be pretty invasive. Instead,
we can easily implement (2) by calling the put/load architectural
backends, and keep preemption disabled. We can then reload the
state back into EL1.
Cc: stable@vger.kernel.org
Reported-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/kvm_host.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 8a37c8e89777..1b179b1f46bc 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -421,4 +421,6 @@ static inline bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu) return true; } +#define kvm_arm_vcpu_loaded(vcpu) (false) + #endif /* __ARM_KVM_HOST_H__ */ |