diff mbox series

[v2,58/94] arm64: KVM: nv: Honor SCTLR_EL2.SPAN on entering vEL2

Message ID 20200211174938.27809-59-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: ARMv8.3/8.4 Nested Virtualization support | expand

Commit Message

Marc Zyngier Feb. 11, 2020, 5:49 p.m. UTC 
On entering vEL2, we must honor the SCTLR_EL2.SPAN bit so that
PSTATE.PAN reflect the expected setting.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/emulate-nested.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index 8380ed810062..97af080b9b52 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c
@@ -131,9 +131,11 @@  void kvm_emulate_nested_eret(struct kvm_vcpu *vcpu)
 static void enter_el2_exception(struct kvm_vcpu *vcpu, u64 esr_el2,
 				enum exception_type type)
 {
+	u64 spsr = *vcpu_cpsr(vcpu);
+
 	trace_kvm_inject_nested_exception(vcpu, esr_el2, type);
 
-	vcpu_write_sys_reg(vcpu, *vcpu_cpsr(vcpu), SPSR_EL2);
+	vcpu_write_sys_reg(vcpu, spsr, SPSR_EL2);
 	vcpu_write_sys_reg(vcpu, *vcpu_pc(vcpu), ELR_EL2);
 	vcpu_write_sys_reg(vcpu, esr_el2, ESR_EL2);
 
@@ -141,6 +143,15 @@  static void enter_el2_exception(struct kvm_vcpu *vcpu, u64 esr_el2,
 	/* On an exception, PSTATE.SP becomes 1 */
 	*vcpu_cpsr(vcpu) = PSR_MODE_EL2h;
 	*vcpu_cpsr(vcpu) |= PSR_A_BIT | PSR_F_BIT | PSR_I_BIT | PSR_D_BIT;
+
+	/*
+	 * If SPAN is clear, set the PAN bit on exception entry
+	 * if SPAN is set, copy the PAN bit across
+	 */
+	if (!(vcpu_read_sys_reg(vcpu, SCTLR_EL2) & SCTLR_EL1_SPAN))
+		*vcpu_cpsr(vcpu) |= PSR_PAN_BIT;
+	else
+		*vcpu_cpsr(vcpu) |= (spsr & PSR_PAN_BIT);
 }
 
 /*