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[v7,10/68] KVM: arm64: nv: Inject HVC exceptions to the virtual EL2

Message ID 20230112191927.1814989-11-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 Jan. 12, 2023, 7:18 p.m. UTC 
From: Jintack Lim <jintack.lim@linaro.org>

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.

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Jintack Lim <jintack.lim@linaro.org>
[maz: add handling of HCR_EL2.HCD]
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/handle_exit.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index e778eefcf214..2d8c09cf3e49 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/stacktrace/nvhe.h>
 #include <asm/traps.h>
@@ -41,6 +42,16 @@  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 (vcpu_has_nv(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);