x86/mm: Don't disable PCID when INVLPG has been fixed by microcode

Per the "Processor Specification Update" documentations referred by
the intel-microcode-20240312 release note, this microcode release has
fixed the issue for all affected models.

So don't disable PCID if the microcode is new enough.  The precise
minimum microcode revision fixing the issue was provided by Pawan
Intel.

[ dhansen: comment and changelog tweaks ]

Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Link: https://lore.kernel.org/all/168436059559.404.13934972543631851306.tip-bot2@tip-bot2/
Link: https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases/tag/microcode-20240312
Link: https://cdrdv2.intel.com/v1/dl/getContent/740518
Link: https://cdrdv2.intel.com/v1/dl/getContent/682436
Link: https://lore.kernel.org/all/20240325231300.qrltbzf6twm43ftb@desk/
Link: https://lore.kernel.org/all/20240522020625.69418-1-xry111%40xry111.site

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index eb503f53c3195ca4f299593c0112dab0fb09e7dd..101725c149c4294f22e337845e01c82dfe71cde5 100644 (file)
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -263,28 +263,33 @@ static void __init probe_page_size_mask(void)
 }
 
 /*
- * INVLPG may not properly flush Global entries
- * on these CPUs when PCIDs are enabled.
+ * INVLPG may not properly flush Global entries on
+ * these CPUs.  New microcode fixes the issue.
  */
 static const struct x86_cpu_id invlpg_miss_ids[] = {
-       X86_MATCH_VFM(INTEL_ALDERLAKE,      0),
-       X86_MATCH_VFM(INTEL_ALDERLAKE_L,    0),
-       X86_MATCH_VFM(INTEL_ATOM_GRACEMONT, 0),
-       X86_MATCH_VFM(INTEL_RAPTORLAKE,     0),
-       X86_MATCH_VFM(INTEL_RAPTORLAKE_P,   0),
-       X86_MATCH_VFM(INTEL_RAPTORLAKE_S,   0),
+       X86_MATCH_VFM(INTEL_ALDERLAKE,      0x2e),
+       X86_MATCH_VFM(INTEL_ALDERLAKE_L,    0x42c),
+       X86_MATCH_VFM(INTEL_ATOM_GRACEMONT, 0x11),
+       X86_MATCH_VFM(INTEL_RAPTORLAKE,     0x118),
+       X86_MATCH_VFM(INTEL_RAPTORLAKE_P,   0x4117),
+       X86_MATCH_VFM(INTEL_RAPTORLAKE_S,   0x2e),
        {}
 };
 
 static void setup_pcid(void)
 {
+       const struct x86_cpu_id *invlpg_miss_match;
+
        if (!IS_ENABLED(CONFIG_X86_64))
                return;
 
        if (!boot_cpu_has(X86_FEATURE_PCID))
                return;
 
-       if (x86_match_cpu(invlpg_miss_ids)) {
+       invlpg_miss_match = x86_match_cpu(invlpg_miss_ids);
+
+       if (invlpg_miss_match &&
+           boot_cpu_data.microcode < invlpg_miss_match->driver_data) {
                pr_info("Incomplete global flushes, disabling PCID");
                setup_clear_cpu_cap(X86_FEATURE_PCID);
                return;