Subject: [PATCH v5 15/69] KVM: arm64: nv: Inject HVC exceptions to the virtual EL2

From: Marc Zyngier <[email-masked]>
Date: Mon, 29 Nov 2021 20:00:56 +0000

From: Jintack Lim <[email-masked]>

As we expect all PSCI calls from the L1 hypervisor to be performed
using SMC when nested virtualization is enabled, it is clear that
all HVC instruction from the VM (including from the virtual EL2)
are supposed to handled in the virtual EL2.

Forward these to EL2 as required.

Signed-off-by: Jintack Lim <[email-masked]>
[maz: add handling of HCR_EL2.HCD]
Signed-off-by: Marc Zyngier <[email-masked]>
---
 arch/arm64/kvm/handle_exit.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index 275a27368a04..1fd1c6dfd6a0 100644
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c
@@ -16,6 +16,7 @@
 #include <asm/kvm_asm.h>
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_mmu.h>
+#include <asm/kvm_nested.h>
 #include <asm/debug-monitors.h>
 #include <asm/traps.h>
 
@@ -40,6 +41,16 @@ static int handle_hvc(struct kvm_vcpu *vcpu)
 			    kvm_vcpu_hvc_get_imm(vcpu));
 	vcpu->stat.hvc_exit_stat++;
 
+	/* Forward hvc instructions to the virtual EL2 if the guest has EL2. */
+	if (nested_virt_in_use(vcpu)) {
+		if (vcpu_read_sys_reg(vcpu, HCR_EL2) & HCR_HCD)
+			kvm_inject_undefined(vcpu);
+		else
+			kvm_inject_nested_sync(vcpu, kvm_vcpu_get_esr(vcpu));
+
+		return 1;
+	}
+
 	ret = kvm_hvc_call_handler(vcpu);
 	if (ret < 0) {
 		vcpu_set_reg(vcpu, 0, ~0UL);
-- 
2.30.2

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