[PATCH 4/4] KVM: arm64: trap guest access for REVIDR_EL1 and AIDR_EL1

[Sebastian Ott <sebott@redhat.com>]

Setup a trap for guest access of REVIDR_EL1 and AIDR_EL1 when
the VMs value differs from hardware.

Signed-off-by: Sebastian Ott <sebott@redhat.com>
---
 arch/arm64/kvm/sys_regs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 7d588fedb50a..2918872e3d2a 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -4910,6 +4910,10 @@ static void vcpu_set_hcr(struct kvm_vcpu *vcpu)
 	else
 		vcpu->arch.hcr_el2 |= HCR_TID2;
 
+	if ((kvm_read_vm_id_reg(kvm, SYS_REVIDR_EL1) != read_sysreg(REVIDR_EL1)) ||
+	    (kvm_read_vm_id_reg(kvm, SYS_AIDR_EL1) != read_sysreg(AIDR_EL1)))
+		vcpu->arch.hcr_el2 |= HCR_TID1;
+
 	if (vcpu_el1_is_32bit(vcpu))
 		vcpu->arch.hcr_el2 &= ~HCR_RW;
 
-- 
2.42.0