commit 002374f371bd02df864cce1fe85d90dc5b292837 upstream.
ASID restoration on guest resume should determine the guest execution
mode based on the guest Status register rather than bit 30 of the guest
PC.
Fix the two places in locore.S that do this, loading the guest status
from the cop0 area. Note, this assembly is specific to the trap &
emulate implementation of KVM, so it doesn't need to check the
supervisor bit as that mode is not implemented in the guest.
Fixes: b680f70fc111 ("KVM/MIPS32: Entry point for trampolining to...")
Signed-off-by: James Hogan
Cc: Ralf Baechle
Cc: Paolo Bonzini
Cc: Gleb Natapov
Cc: linux-m...@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini
Signed-off-by: James Hogan
---
arch/mips/kvm/kvm_locore.S | 16 ++--
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/mips/kvm/kvm_locore.S b/arch/mips/kvm/kvm_locore.S
index 03a2db58b22d..ba5ce99c021d 100644
--- a/arch/mips/kvm/kvm_locore.S
+++ b/arch/mips/kvm/kvm_locore.S
@@ -159,9 +159,11 @@ FEXPORT(__kvm_mips_vcpu_run)
FEXPORT(__kvm_mips_load_asid)
/* Set the ASID for the Guest Kernel */
- INT_SLL t0, t0, 1 /* with kseg0 @ 0x4000, kernel */
- /* addresses shift to 0x8000 */
- bltzt0, 1f /* If kernel */
+ PTR_L t0, VCPU_COP0(k1)
+ LONG_L t0, COP0_STATUS(t0)
+ andit0, KSU_USER | ST0_ERL | ST0_EXL
+ xorit0, KSU_USER
+ bnezt0, 1f /* If kernel */
INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */
INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID/* else user */
1:
@@ -438,9 +440,11 @@ __kvm_mips_return_to_guest:
mtc0t0, CP0_EPC
/* Set the ASID for the Guest Kernel */
- INT_SLL t0, t0, 1 /* with kseg0 @ 0x4000, kernel */
- /* addresses shift to 0x8000 */
- bltzt0, 1f /* If kernel */
+ PTR_L t0, VCPU_COP0(k1)
+ LONG_L t0, COP0_STATUS(t0)
+ andit0, KSU_USER | ST0_ERL | ST0_EXL
+ xorit0, KSU_USER
+ bnezt0, 1f /* If kernel */
INT_ADDIU t1, k1, VCPU_GUEST_KERNEL_ASID /* (BD) */
INT_ADDIU t1, k1, VCPU_GUEST_USER_ASID/* else user */
1:
--
2.4.10
--
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