TDX VM requires VM type KVM_X86_TDX_VM to be passed to
kvm_ioctl(KVM_CREATE_VM). Hence implement mc->kvm_type() for i386
architecture.
If tdx-guest object is specified to confidential-guest-support, like,
qemu -machine ...,confidential-guest-support=tdx0 \
-object tdx-guest,id=tdx0,...
it parses VM type as KVM_X86_TDX_VM. Otherwise, it's KVM_X86_DEFAULT_VM.
Also store the vm_type in MachineState for other code to query what the
VM type is.
Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
Acked-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
Changes in v4:
- fix the build error of kvm_get_vm_type() when --disable-kvm;
---
hw/i386/x86.c | 12 ++++++++++++
include/hw/i386/x86.h | 1 +
target/i386/kvm/kvm.c | 30 ++++++++++++++++++++++++++++++
target/i386/kvm/kvm_i386.h | 1 +
4 files changed, 44 insertions(+)
diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 807e09bcdbb8..fa7095310f37 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -1389,6 +1389,17 @@ static void machine_set_sgx_epc(Object *obj, Visitor *v, const char *name,
qapi_free_SgxEPCList(list);
}
+static int x86_kvm_type(MachineState *ms, const char *vm_type)
+{
+ X86MachineState *x86ms = X86_MACHINE(ms);
+ int kvm_type;
+
+ kvm_type = kvm_enabled() ? kvm_get_vm_type(ms, vm_type) : 0;
+ x86ms->vm_type = kvm_type;
+
+ return kvm_type;
+}
+
static void x86_machine_initfn(Object *obj)
{
X86MachineState *x86ms = X86_MACHINE(obj);
@@ -1413,6 +1424,7 @@ static void x86_machine_class_init(ObjectClass *oc, void *data)
mc->cpu_index_to_instance_props = x86_cpu_index_to_props;
mc->get_default_cpu_node_id = x86_get_default_cpu_node_id;
mc->possible_cpu_arch_ids = x86_possible_cpu_arch_ids;
+ mc->kvm_type = x86_kvm_type;
x86mc->save_tsc_khz = true;
x86mc->fwcfg_dma_enabled = true;
nc->nmi_monitor_handler = x86_nmi;
diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
index 4dc30dcb4d26..d28e79cc484a 100644
--- a/include/hw/i386/x86.h
+++ b/include/hw/i386/x86.h
@@ -43,6 +43,7 @@ struct X86MachineState {
MachineState parent;
/*< public >*/
+ unsigned int vm_type;
/* Pointers to devices and objects: */
ISADevice *rtc;
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index ca4e1fb72dd9..898f8fb30c61 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -32,6 +32,7 @@
#include "sysemu/runstate.h"
#include "kvm_i386.h"
#include "sev.h"
+#include "tdx.h"
#include "xen-emu.h"
#include "hyperv.h"
#include "hyperv-proto.h"
@@ -161,6 +162,35 @@ static KVMMSRHandlers msr_handlers[KVM_MSR_FILTER_MAX_RANGES];
static RateLimit bus_lock_ratelimit_ctrl;
static int kvm_get_one_msr(X86CPU *cpu, int index, uint64_t *value);
+static const char *vm_type_name[] = {
+ [KVM_X86_DEFAULT_VM] = "default",
+ [KVM_X86_TDX_VM] = "tdx",
+};
+
+int kvm_get_vm_type(MachineState *ms, const char *vm_type)
+{
+ int kvm_type = KVM_X86_DEFAULT_VM;
+
+ if (ms->cgs && object_dynamic_cast(OBJECT(ms->cgs), TYPE_TDX_GUEST)) {
+ kvm_type = KVM_X86_TDX_VM;
+ }
+
+ /*
+ * old KVM doesn't support KVM_CAP_VM_TYPES and KVM_X86_DEFAULT_VM
+ * is always supported
+ */
+ if (kvm_type == KVM_X86_DEFAULT_VM) {
+ return kvm_type;
+ }
+
+ if (!(kvm_check_extension(KVM_STATE(ms->accelerator), KVM_CAP_VM_TYPES) & BIT(kvm_type))) {
+ error_report("vm-type %s not supported by KVM", vm_type_name[kvm_type]);
+ exit(1);
+ }
+
+ return kvm_type;
+}
+
bool kvm_has_smm(void)
{
return kvm_vm_check_extension(kvm_state, KVM_CAP_X86_SMM);
diff --git a/target/i386/kvm/kvm_i386.h b/target/i386/kvm/kvm_i386.h
index 30fedcffea3e..55fb25fa8e2e 100644
--- a/target/i386/kvm/kvm_i386.h
+++ b/target/i386/kvm/kvm_i386.h
@@ -37,6 +37,7 @@ bool kvm_hv_vpindex_settable(void);
bool kvm_enable_sgx_provisioning(KVMState *s);
bool kvm_hyperv_expand_features(X86CPU *cpu, Error **errp);
+int kvm_get_vm_type(MachineState *ms, const char *vm_type);
void kvm_arch_reset_vcpu(X86CPU *cs);
void kvm_arch_after_reset_vcpu(X86CPU *cpu);
void kvm_arch_do_init_vcpu(X86CPU *cs);
--
2.34.1
