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authorChristoffer Dall <christoffer.dall@linaro.org>2014-08-26 14:33:02 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2014-08-29 11:53:53 +0200
commit05e0127f9e362b36aa35f17b1a3d52bca9322a3a (patch)
treefbf9095f4a612ac8d58c3328fb4170297d5339a1 /arch/arm
parentf6edbbf36da3a27b298b66c7955fc84e1dcca305 (diff)
arm/arm64: KVM: Complete WFI/WFE instructions
The architecture specifies that when the processor wakes up from a WFE or WFI instruction, the instruction is considered complete, however we currrently return to EL1 (or EL0) at the WFI/WFE instruction itself. While most guests may not be affected by this because their local exception handler performs an exception returning setting the event bit or with an interrupt pending, some guests like UEFI will get wedged due this little mishap. Simply skip the instruction when we have completed the emulation. Cc: <stable@vger.kernel.org> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kvm/handle_exit.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index 4c979d466cc1..a96a8043277c 100644
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -93,6 +93,8 @@ static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
else
kvm_vcpu_block(vcpu);
+ kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+
return 1;
}