[PATCH 6/9] hw/arm, target/arm: nested virtualisation on HVF

[Mohamed Mediouni <mohamed@unpredictable.fr>]

Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>
---
 hw/arm/virt.c         |  6 +++---
 target/arm/hvf-stub.c | 15 +++++++++++++++
 target/arm/hvf/hvf.c  | 35 +++++++++++++++++++++++++++++++++++
 target/arm/hvf_arm.h  |  3 +++
 4 files changed, 56 insertions(+), 3 deletions(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index a26bde4c75..df77a1d911 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -817,8 +817,7 @@ static void create_gic(VirtMachineState *vms, MemoryRegion *mem)
         g_assert_not_reached();
     }
 
-    if (kvm_enabled() && vms->virt &&
-        (revision != 3 || !kvm_irqchip_in_kernel())) {
+    if (kvm_enabled() && vms->virt && (revision != 3 || !kvm_irqchip_in_kernel())) {
         error_report("KVM EL2 is only supported with in-kernel GICv3");
         exit(1);
     }
@@ -2278,7 +2277,8 @@ static void machvirt_init(MachineState *machine)
         exit(1);
     }
 
-    if (vms->virt && !kvm_enabled() && !tcg_enabled() && !qtest_enabled()) {
+    if (vms->virt && !kvm_enabled() && !tcg_enabled()
+       && !qtest_enabled()) {
         error_report("mach-virt: %s does not support providing "
                      "Virtualization extensions to the guest CPU",
                      current_accel_name());
diff --git a/target/arm/hvf-stub.c b/target/arm/hvf-stub.c
index ff137267a0..95ec4ea62f 100644
--- a/target/arm/hvf-stub.c
+++ b/target/arm/hvf-stub.c
@@ -18,3 +18,18 @@ uint32_t hvf_arm_get_max_ipa_bit_size(void)
 {
     g_assert_not_reached();
 }
+
+bool hvf_arm_el2_supported(void)
+{
+    g_assert_not_reached();
+}
+
+bool hvf_arm_el2_enabled(void)
+{
+    g_assert_not_reached();
+}
+
+void hvf_arm_el2_enable(bool)
+{
+    g_assert_not_reached();
+}
diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 7b4e8297af..c32e6ab289 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -26,6 +26,7 @@
 #include "system/address-spaces.h"
 #include "system/memory.h"
 #include "hw/boards.h"
+#include "hw/arm/virt.h"
 #include "hw/irq.h"
 #include "qemu/main-loop.h"
 #include "system/cpus.h"
@@ -891,6 +892,10 @@ static bool hvf_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
                      (1ULL << ARM_FEATURE_PMU) |
                      (1ULL << ARM_FEATURE_GENERIC_TIMER);
 
+    if (hvf_arm_el2_enabled()) {
+        ahcf->features |= 1ULL << ARM_FEATURE_EL2;
+    }
+
     /* We set up a small vcpu to extract host registers */
 
     if (hv_vcpu_create(&fd, &exit, NULL) != HV_SUCCESS) {
@@ -964,6 +969,25 @@ uint32_t hvf_arm_get_max_ipa_bit_size(void)
     return round_down_to_parange_bit_size(max_ipa_size);
 }
 
+bool hvf_arm_el2_supported(void)
+{
+    bool is_nested_virt_supported;
+    hv_return_t ret = hv_vm_config_get_el2_supported(&is_nested_virt_supported);
+    assert_hvf_ok(ret);
+    return is_nested_virt_supported;
+}
+
+static bool is_nested_virt_enabled = false;
+bool hvf_arm_el2_enabled(void)
+{
+    return is_nested_virt_enabled;
+}
+
+void hvf_arm_el2_enable(bool enable)
+{
+    is_nested_virt_enabled = enable;
+}
+
 void hvf_arm_set_cpu_features_from_host(ARMCPU *cpu)
 {
     if (!arm_host_cpu_features.dtb_compatible) {
@@ -1000,6 +1024,13 @@ hv_return_t hvf_arch_vm_create(MachineState *ms, uint32_t pa_range)
     }
     chosen_ipa_bit_size = pa_range;
 
+    if (hvf_arm_el2_enabled()) {
+        ret = hv_vm_config_set_el2_enabled(config, true);
+        if (ret != HV_SUCCESS) {
+            goto cleanup;
+        }
+    }
+
     ret = hv_vm_create(config);
     if (hvf_irqchip_in_kernel()) {
         /*
@@ -1146,6 +1177,10 @@ static bool hvf_handle_psci_call(CPUState *cpu)
     int target_el = 1;
     int32_t ret = 0;
 
+    if (hvf_arm_el2_enabled()) {
+        target_el = 2;
+    }
+
     trace_hvf_psci_call(param[0], param[1], param[2], param[3],
                         arm_cpu_mp_affinity(arm_cpu));
 
diff --git a/target/arm/hvf_arm.h b/target/arm/hvf_arm.h
index ea82f2691d..bf55e7ae28 100644
--- a/target/arm/hvf_arm.h
+++ b/target/arm/hvf_arm.h
@@ -24,5 +24,8 @@ void hvf_arm_set_cpu_features_from_host(ARMCPU *cpu);
 
 uint32_t hvf_arm_get_default_ipa_bit_size(void);
 uint32_t hvf_arm_get_max_ipa_bit_size(void);
+bool hvf_arm_el2_supported(void);
+bool hvf_arm_el2_enabled(void);
+void hvf_arm_el2_enable(bool);
 
 #endif
-- 
2.39.5 (Apple Git-154)