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[v4,25/66] KVM: arm64: nv: Respect virtual HCR_EL2.TVM and TRVM settings

Message ID 20210510165920.1913477-26-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 May 10, 2021, 4:58 p.m. UTC
From: Jintack Lim <jintack.lim@linaro.org>

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@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
 arch/arm64/kvm/sys_regs.c | 7 +++++++
 1 file changed, 7 insertions(+)
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diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 98b6fe77b53e..35bdfa0cb1ff 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -386,6 +386,13 @@  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_mode_el2(vcpu) && !p->is_write);