diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:11:01 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:11:01 +0000 |
| commit | 0ee2e7d08695233d29d4656e2a74e948f27e8ab5 (patch) | |
| tree | d1becc7d49fc54e54a4f67eb179b096f17c5966b /linux-kernel-patches/03-42ca8082e260dcfd8afa2afa6ec1940b9d41724c.patch | |
| parent | Initial commit. (diff) | |
| download | intel-microcode-0ee2e7d08695233d29d4656e2a74e948f27e8ab5.tar.xz intel-microcode-0ee2e7d08695233d29d4656e2a74e948f27e8ab5.zip | |
Adding upstream version 3.20231114.1~deb12u1.upstream/3.20231114.1_deb12u1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'linux-kernel-patches/03-42ca8082e260dcfd8afa2afa6ec1940b9d41724c.patch')
| -rw-r--r-- | linux-kernel-patches/03-42ca8082e260dcfd8afa2afa6ec1940b9d41724c.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/linux-kernel-patches/03-42ca8082e260dcfd8afa2afa6ec1940b9d41724c.patch b/linux-kernel-patches/03-42ca8082e260dcfd8afa2afa6ec1940b9d41724c.patch new file mode 100644 index 0000000..b4a17ca --- /dev/null +++ b/linux-kernel-patches/03-42ca8082e260dcfd8afa2afa6ec1940b9d41724c.patch @@ -0,0 +1,64 @@ +From 42ca8082e260dcfd8afa2afa6ec1940b9d41724c Mon Sep 17 00:00:00 2001
+From: Borislav Petkov <bp@suse.de>
+Date: Fri, 16 Feb 2018 12:26:40 +0100
+Subject: x86/CPU: Check CPU feature bits after microcode upgrade
+
+With some microcode upgrades, new CPUID features can become visible on
+the CPU. Check what the kernel has mirrored now and issue a warning
+hinting at possible things the user/admin can do to make use of the
+newly visible features.
+
+Originally-by: Ashok Raj <ashok.raj@intel.com>
+Tested-by: Ashok Raj <ashok.raj@intel.com>
+Signed-off-by: Borislav Petkov <bp@suse.de>
+Reviewed-by: Ashok Raj <ashok.raj@intel.com>
+Cc: Andy Lutomirski <luto@kernel.org>
+Cc: Arjan van de Ven <arjan@linux.intel.com>
+Cc: Borislav Petkov <bp@alien8.de>
+Cc: Dan Williams <dan.j.williams@intel.com>
+Cc: Dave Hansen <dave.hansen@linux.intel.com>
+Cc: David Woodhouse <dwmw2@infradead.org>
+Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Cc: Josh Poimboeuf <jpoimboe@redhat.com>
+Cc: Linus Torvalds <torvalds@linux-foundation.org>
+Cc: Peter Zijlstra <peterz@infradead.org>
+Cc: Thomas Gleixner <tglx@linutronix.de>
+Link: http://lkml.kernel.org/r/20180216112640.11554-4-bp@alien8.de
+Signed-off-by: Ingo Molnar <mingo@kernel.org>
+---
+ arch/x86/kernel/cpu/common.c | 20 ++++++++++++++++++++
+ 1 file changed, 20 insertions(+)
+
+diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
+index 84f1cd8..348cf48 100644
+--- a/arch/x86/kernel/cpu/common.c
++++ b/arch/x86/kernel/cpu/common.c
+@@ -1757,5 +1757,25 @@ core_initcall(init_cpu_syscore);
+ */
+ void microcode_check(void)
+ {
++ struct cpuinfo_x86 info;
++
+ perf_check_microcode();
++
++ /* Reload CPUID max function as it might've changed. */
++ info.cpuid_level = cpuid_eax(0);
++
++ /*
++ * Copy all capability leafs to pick up the synthetic ones so that
++ * memcmp() below doesn't fail on that. The ones coming from CPUID will
++ * get overwritten in get_cpu_cap().
++ */
++ memcpy(&info.x86_capability, &boot_cpu_data.x86_capability, sizeof(info.x86_capability));
++
++ get_cpu_cap(&info);
++
++ if (!memcmp(&info.x86_capability, &boot_cpu_data.x86_capability, sizeof(info.x86_capability)))
++ return;
++
++ pr_warn("x86/CPU: CPU features have changed after loading microcode, but might not take effect.\n");
++ pr_warn("x86/CPU: Please consider either early loading through initrd/built-in or a potential BIOS update.\n");
+ }
+--
+cgit v1.1
+
|