[RFC 55/55] KVM: arm64: Enable nested virtualization

Jintack Lim
2017-01-09T06:24:51Z

Now that everything is ready, we enable nested virtualization by setting
the HCR NV and NV1 bit.

Signed-off-by: Jintack Lim <jintack@cs.columbia.edu>
---
arch/arm64/include/asm/kvm_arm.h | 1 +
arch/arm64/kvm/hyp/switch.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index f9addf3..ab8b93b 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -24,6 +24,7 @@

/* Hyp Configuration Register (HCR) bits */
#define HCR_NV1 (UL(1) << 43)
+#define HCR_NV (UL(1) << 42)
#define HCR_E2H (UL(1) << 34)
#define HCR_ID (UL(1) << 33)
#define HCR_CD (UL(1) << 32)
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index c80b2ae..df7b88d 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -87,7 +87,7 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu)
isb();
}
if (vcpu_mode_el2(vcpu))
- val |= HCR_TVM | HCR_TRVM;
+ val |= HCR_TVM | HCR_TRVM | HCR_NV | HCR_NV1;
write_sysreg(val, hcr_el2);
/* Trap on AArch32 cp15 c15 accesses (EL1 or EL0) */
write_sysreg(1 << 15, hstr_el2);
--
1.9.1