diff mbox series

[v7,49/52] i386/tdx: Don't treat SYSCALL as unavailable

Message ID 20250124132048.3229049-50-xiaoyao.li@intel.com (mailing list archive)
State New
Headers show
Series QEMU TDX support | expand

Commit Message

Xiaoyao Li Jan. 24, 2025, 1:20 p.m. UTC 
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
Changes in v7:
 - fix CPUID_EXT2_SYSCALL by adding it to actual;
---
 target/i386/kvm/tdx.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
diff mbox series

Patch

diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index f6a4f3322e61..58ea6a4d3156 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -804,6 +804,19 @@  static int tdx_check_features(X86ConfidentialGuest *cg, CPUState *cs)
             continue;
         }
 
+        /* Fixup for special cases */
+        switch (w) {
+        case FEAT_8000_0001_EDX:
+            /*
+             * Intel enumerates SYSCALL bit as 1 only when processor in 64-bit
+             * mode and before vcpu running it's not in 64-bit mode.
+             */
+            actual |= CPUID_EXT2_SYSCALL;
+            break;
+        default:
+            break;
+        }
+
         requested = env->features[w];
         unavailable = requested & ~actual;
         mark_unavailable_features(cpu, w, unavailable, unav_prefix);