diff mbox series

[RFC,v4,35/36] i386/tdx: Don't get/put guest state for TDX VMs

Message ID 20220512031803.3315890-36-xiaoyao.li@intel.com
State New
Headers show
Series TDX QEMU support | expand

Commit Message

Xiaoyao Li May 12, 2022, 3:18 a.m. UTC 
From: Sean Christopherson <sean.j.christopherson@intel.com>

Don't get/put state of TDX VMs since accessing/mutating guest state of
production TDs is not supported.

Note, it will be allowed for a debug TD. Corresponding support will be
introduced when debug TD support is implemented in the future.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
 target/i386/kvm/kvm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 4d520d0e34bd..3e26dacf7807 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -4478,6 +4478,11 @@  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 (is_tdx_vm()) {
+        return 0;
+    }
+
     /* must be before kvm_put_nested_state so that EFER.SVME is set */
     ret = has_sregs2 ? kvm_put_sregs2(x86_cpu) : kvm_put_sregs(x86_cpu);
     if (ret < 0) {
@@ -4572,6 +4577,12 @@  int kvm_arch_get_registers(CPUState *cs)
     if (ret < 0) {
         goto out;
     }
+
+    /* TODO: Allow accessing guest state for debug TDs. */
+    if (is_tdx_vm()) {
+        return 0;
+    }
+
     ret = kvm_getput_regs(cpu, 0);
     if (ret < 0) {
         goto out;