diff mbox series

[v4,7/8] i386/cpu: Adjust CPUID level for RDT features

Message ID 20241205200025.2081863-8-whendrik@google.com (mailing list archive)
State New
Headers show
Series Emulate Intel RDT features needed to mount ResCtrl in Linux | expand

Commit Message

Hendrik Wuethrich Dec. 5, 2024, 8 p.m. UTC 
From: ‪Hendrik Wüthrich <whendrik@google.com>

Adjust minimum CPUID level if RDT monitoring or allocation features are
enabled to ensure that CPUID will return them.

Signed-off-by: Hendrik Wüthrich <whendrik@google.com>
---
 target/i386/cpu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 5e29bf341c..045705884a 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -7719,6 +7719,16 @@  void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
         if (env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_SGX) {
             x86_cpu_adjust_level(cpu, &env->cpuid_min_level, 0x12);
         }
+
+        /* RDT monitoring requires CPUID[0xF] */
+        if (env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_PQM) {
+            x86_cpu_adjust_level(cpu, &env->cpuid_min_level, 0xF);
+        }
+
+        /* RDT allocation requires CPUID[0x10] */
+        if (env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_PQE) {
+            x86_cpu_adjust_level(cpu, &env->cpuid_min_level, 0x10);
+        }
     }
 
     /* Set cpuid_*level* based on cpuid_min_*level, if not explicitly set */