[PATCH 5.15 377/402] KVM: arm64: Allow AArch32 PSTATE.M to be restored as System mode

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marc Zyngier <maz@xxxxxxxxxx>

commit dfe6d190f38fc5df5ff2614b463a5195a399c885 upstream.

It appears that we don't allow a vcpu to be restored in AArch32
System mode, as we *never* included it in the list of valid modes.

Just add it to the list of allowed modes.

Fixes: 0d854a60b1d7 ("arm64: KVM: enable initialization of a 32bit vcpu")
Cc: stable@xxxxxxxxxxxxxxx
Acked-by: Oliver Upton <oliver.upton@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240524141956.1450304-3-maz@xxxxxxxxxx
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/arm64/kvm/guest.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -250,6 +250,7 @@ static int set_core_reg(struct kvm_vcpu
 		case PSR_AA32_MODE_SVC:
 		case PSR_AA32_MODE_ABT:
 		case PSR_AA32_MODE_UND:
+		case PSR_AA32_MODE_SYS:
 			if (!vcpu_el1_is_32bit(vcpu))
 				return -EINVAL;
 			break;






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