[RFC,14/23] i386/tdx: Frame in the call for KVM_TDX_INIT_VCPU

Commit Message

Isaku Yamahata Feb. 16, 2021, 2:13 a.m. UTC

Signed-off-by: Sean Christopherson <[e-mail]>
---
 include/sysemu/tdx.h       |  1 +
 target/i386/kvm/kvm.c      |  8 ++++++++
 target/i386/kvm/tdx-stub.c |  4 ++++
 target/i386/kvm/tdx.c      | 20 ++++++++++++++++----
 4 files changed, 29 insertions(+), 4 deletions(-)

Patch

diff --git a/include/sysemu/tdx.h b/include/sysemu/tdx.h
index 36a901e723..03461b6ae8 100644
--- a/include/sysemu/tdx.h
+++ b/include/sysemu/tdx.h
@@ -8,5 +8,6 @@  bool kvm_has_tdx(KVMState *s);
 #endif
 
 void tdx_pre_create_vcpu(CPUState *cpu);
+void tdx_post_init_vcpu(CPUState *cpu);
 
 #endif
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index e6f7015be8..52dbccedb5 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -4034,6 +4034,14 @@  int kvm_arch_put_registers(CPUState *cpu, int level)
 
     assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu));
 
+    /*
+     * level == KVM_PUT_FULL_STATE is only set by
+     * kvm_cpu_synchronize_post_init() after initialization
+     */
+    if (vm_type == KVM_X86_TDX_VM && level == KVM_PUT_FULL_STATE) {
+        tdx_post_init_vcpu(cpu);
+    }
+
     /* TODO: Allow accessing guest state for debug TDs. */
     if (vm_type == KVM_X86_TDX_VM) {
         return 0;
diff --git a/target/i386/kvm/tdx-stub.c b/target/i386/kvm/tdx-stub.c
index 93d5913c89..93afe07ddb 100644
--- a/target/i386/kvm/tdx-stub.c
+++ b/target/i386/kvm/tdx-stub.c
@@ -12,3 +12,7 @@  bool kvm_has_tdx(KVMState *s)
 void tdx_pre_create_vcpu(CPUState *cpu)
 {
 }
+
+void tdx_post_init_vcpu(CPUState *cpu)
+{
+}
diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index 9d4195a705..d095dab662 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -36,7 +36,7 @@  bool kvm_has_tdx(KVMState *s)
     return !!(kvm_check_extension(s, KVM_CAP_VM_TYPES) & BIT(KVM_X86_TDX_VM));
 }
 
-static void __tdx_ioctl(int ioctl_no, const char *ioctl_name,
+static void __tdx_ioctl(void *state, int ioctl_no, const char *ioctl_name,
                         __u32 metadata, void *data)
 {
     struct kvm_tdx_cmd tdx_cmd;
@@ -49,17 +49,21 @@  static void __tdx_ioctl(int ioctl_no, const char *ioctl_name,
     tdx_cmd.data = (__u64)(unsigned long)data;
 
     if (ioctl_no == KVM_TDX_CAPABILITIES) {
-        r = kvm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &tdx_cmd);
+        r = kvm_ioctl(state, KVM_MEMORY_ENCRYPT_OP, &tdx_cmd);
+    } else if (ioctl_no == KVM_TDX_INIT_VCPU) {
+        r = kvm_vcpu_ioctl(state, KVM_MEMORY_ENCRYPT_OP, &tdx_cmd);
     } else {
-        r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &tdx_cmd);
+        r = kvm_vm_ioctl(state, KVM_MEMORY_ENCRYPT_OP, &tdx_cmd);
     }
     if (r) {
         error_report("%s failed: %s", ioctl_name, strerror(-r));
         exit(1);
     }
 }
+#define _tdx_ioctl(cpu, ioctl_no, metadata, data) \
+        __tdx_ioctl(cpu, ioctl_no, stringify(ioctl_no), metadata, data)
 #define tdx_ioctl(ioctl_no, metadata, data) \
-        __tdx_ioctl(ioctl_no, stringify(ioctl_no), metadata, data)
+        _tdx_ioctl(kvm_state, ioctl_no, metadata, data)
 
 static void tdx_finalize_vm(Notifier *notifier, void *unused)
 {
@@ -202,6 +206,14 @@  out:
     qemu_mutex_unlock(&tdx->lock);
 }
 
+void tdx_post_init_vcpu(CPUState *cpu)
+{
+    CPUX86State *env = &X86_CPU(cpu)->env;
+
+    _tdx_ioctl(cpu, KVM_TDX_INIT_VCPU, 0,
+               (void *)(unsigned long)env->regs[R_ECX]);
+}
+
 static bool tdx_guest_get_debug(Object *obj, Error **errp)
 {
     TdxGuest *tdx = TDX_GUEST(obj);