From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Ignore get/put state of TDX VMs as accessing/mutating guest state of
producation TDs is not supported.
Allow kvm_arch_get_registers() to run as normal, except for MSRs, for
debug TDs, and silently ignores attempts to read guest state for
non-debug TDs.
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
target/i386/kvm/kvm.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index a3d5b334d1..27b64dedc2 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -2641,6 +2641,11 @@ void kvm_put_apicbase(X86CPU *cpu, uint64_t value)
{
int ret;
+ /* TODO: Allow accessing guest state for debug TDs. */
+ if (vm_type == KVM_X86_TDX_VM) {
+ return;
+ }
+
ret = kvm_put_one_msr(cpu, MSR_IA32_APICBASE, value);
assert(ret == 1);
}
@@ -4099,6 +4104,11 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu));
+ /* TODO: Allow accessing guest state for debug TDs. */
+ if (vm_type == KVM_X86_TDX_VM) {
+ return 0;
+ }
+
/* must be before kvm_put_nested_state so that EFER.SVME is set */
ret = kvm_put_sregs(x86_cpu);
if (ret < 0) {
@@ -4209,9 +4219,11 @@ int kvm_arch_get_registers(CPUState *cs)
if (ret < 0) {
goto out;
}
- ret = kvm_get_msrs(cpu);
- if (ret < 0) {
- goto out;
+ if (vm_type != KVM_X86_TDX_VM) {
+ ret = kvm_get_msrs(cpu);
+ if (ret < 0) {
+ goto out;
+ }
}
ret = kvm_get_apic(cpu);
if (ret < 0) {
--
2.25.1
