From: Jintack Lim <jintack.lim@xxxxxxxxxx>
Forward the EL1 virtual memory register traps to the virtual EL2 if they
are not coming from the virtual EL2 and the virtual HCR_EL2.TVM or TRVM
bit is set.
This is for recursive nested virtualization.
Signed-off-by: Jintack Lim <jintack.lim@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index ccd063d6cb69..edaf287c7ec9 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -351,6 +351,13 @@ static bool access_vm_reg(struct kvm_vcpu *vcpu,
if (el12_reg(p) && forward_nv_traps(vcpu))
return false;
+ if (!el12_reg(p)) {
+ u64 bit = p->is_write ? HCR_TVM : HCR_TRVM;
+
+ if (forward_traps(vcpu, bit))
+ return false;
+ }
+
/* We don't expect TRVM on the host */
BUG_ON(!vcpu_is_el2(vcpu) && !p->is_write);
--
2.30.2
