[PATCH v2 4/7] KVM: arm64: Set IL for injected FPAC exceptions during ERET emulation

[Fuad Tabba]

The FPAC syndrome constructed during nested ERET emulation does not set
IL. For FPAC (EC=0x1C), IL reflects the instruction length. ERET and
its authenticated variants are always A64 32-bit instructions, so IL
must be 1.

Fixes: 213b3d1ea161 ("KVM: arm64: nv: Handle ERETA[AB] instructions")
Suggested-by: Marc Zyngier <maz at kernel.org>
Signed-off-by: Fuad Tabba <tabba at google.com>
---
 arch/arm64/kvm/emulate-nested.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index dba7ced74ca5..b74369e9ad7f 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c
@@ -2776,7 +2776,7 @@ void kvm_emulate_nested_eret(struct kvm_vcpu *vcpu)
 		 * ERET handling, and the guest will have a little surprise.
 		 */
 		if (kvm_has_pauth(vcpu->kvm, FPACCOMBINE) && !(spsr & PSR_IL_BIT)) {
-			esr &= ESR_ELx_ERET_ISS_ERETA;
+			esr &= (ESR_ELx_ERET_ISS_ERETA | ESR_ELx_IL);
 			esr |= FIELD_PREP(ESR_ELx_EC_MASK, ESR_ELx_EC_FPAC);
 			kvm_inject_nested_sync(vcpu, esr);
 			return;
-- 
2.54.0.1189.g8c84645362-goog