Bigger than average pull request for QEMU 11.0

[PULL 141/153] i386/cpu: Allow unsupported avx10_version with x-force-features

Paolo Bonzini posted 153 patches 1 week, 4 days ago

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Maintainers: "Alex Bennée" <alex.bennee@linaro.org>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Thomas Huth <thuth@redhat.com>, Yonggang Luo <luoyonggang@gmail.com>, Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Cameron Esfahani <dirty@apple.com>, Roman Bolshakov <rbolshakov@ddn.com>, Phil Dennis-Jordan <phil@philjordan.eu>, Mads Ynddal <mads@ynddal.dk>, Magnus Kulke <magnus.kulke@linux.microsoft.com>, Wei Liu <wei.liu@kernel.org>, Stefano Stabellini <sstabellini@kernel.org>, Anthony PERARD <anthony@xenproject.org>, Paul Durrant <paul@xen.org>, "Edgar E. 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[PULL 141/153] i386/cpu: Allow unsupported avx10_version with x-force-features

Posted by Paolo Bonzini 1 week, 3 days ago

From: Zhao Liu <zhao1.liu@intel.com>

The "force_features" ("x-force-features" property) forces setting
feature even if host doesn't support, but also reports the warning.

Given its function, it's useful for debug, so even if the AVX10
version is unsupported by host, force to set this AVX10 version if
x-force-features=on.

Tested-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20251215073743.4055227-7-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/cpu.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index c460e3bec7c..f62bd48d4b0 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -9490,16 +9490,27 @@ static bool x86_cpu_filter_features(X86CPU *cpu, bool verbose)
         uint8_t version = x86_cpu_get_host_avx10_version();
 
         if (version < env->avx10_version) {
-            if (prefix) {
-                warn_report("%s: avx10.%d. Adjust to avx10.%d",
-                            prefix, env->avx10_version, version);
-            }
             /*
-             * Discrete feature bits have been checked and filtered based on
-             * host support. So it's safe to change version without reverting
-             * other feature bits.
+             * With x-force-features=on, CPUID_7_1_EDX_AVX10 will not be masked
+             * off, so there's no need to zero avx10 version.
              */
-            env->avx10_version = version;
+            if (!cpu->force_features) {
+                if (prefix) {
+                    warn_report("%s: avx10.%d. Adjust to avx10.%d",
+                                prefix, env->avx10_version, version);
+                }
+                /*
+                 * Discrete feature bits have been checked and filtered based
+                 * on host support. So it's safe to change version without
+                 * reverting other feature bits.
+                 */
+                env->avx10_version = version;
+            } else {
+                if (prefix) {
+                    warn_report("%s: avx10.%d.",
+                                prefix, env->avx10_version);
+                }
+            }
             have_filtered_features = true;
         }
     } else if (env->avx10_version) {
-- 
2.52.0