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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-08 19:26:18 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-08 19:26:18 +0000 |
| commit | 09e70a0de2ea691518756b99c4d975e7e6814bea (patch) | |
| tree | 22fa82d0aed0f422007088031c31bfa6f5265e63 /linux-kernel-patches/05-c182d2b7d0ca48e0d6ff16f7d883161238c447ed.patch | |
| parent | Initial commit. (diff) | |
| download | intel-microcode-09e70a0de2ea691518756b99c4d975e7e6814bea.tar.xz intel-microcode-09e70a0de2ea691518756b99c4d975e7e6814bea.zip | |
Adding upstream version 3.20240312.1.upstream/3.20240312.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'linux-kernel-patches/05-c182d2b7d0ca48e0d6ff16f7d883161238c447ed.patch')
| -rw-r--r-- | linux-kernel-patches/05-c182d2b7d0ca48e0d6ff16f7d883161238c447ed.patch | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/linux-kernel-patches/05-c182d2b7d0ca48e0d6ff16f7d883161238c447ed.patch b/linux-kernel-patches/05-c182d2b7d0ca48e0d6ff16f7d883161238c447ed.patch new file mode 100644 index 0000000..0f868bf --- /dev/null +++ b/linux-kernel-patches/05-c182d2b7d0ca48e0d6ff16f7d883161238c447ed.patch @@ -0,0 +1,90 @@ +From c182d2b7d0ca48e0d6ff16f7d883161238c447ed Mon Sep 17 00:00:00 2001
+From: Ashok Raj <ashok.raj@intel.com>
+Date: Wed, 28 Feb 2018 11:28:41 +0100
+Subject: x86/microcode/intel: Check microcode revision before updating sibling
+ threads
+
+After updating microcode on one of the threads of a core, the other
+thread sibling automatically gets the update since the microcode
+resources on a hyperthreaded core are shared between the two threads.
+
+Check the microcode revision on the CPU before performing a microcode
+update and thus save us the WRMSR 0x79 because it is a particularly
+expensive operation.
+
+[ Borislav: Massage changelog and coding style. ]
+
+Signed-off-by: Ashok Raj <ashok.raj@intel.com>
+Signed-off-by: Borislav Petkov <bp@suse.de>
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
+Tested-by: Ashok Raj <ashok.raj@intel.com>
+Cc: Arjan Van De Ven <arjan.van.de.ven@intel.com>
+Link: http://lkml.kernel.org/r/1519352533-15992-2-git-send-email-ashok.raj@intel.com
+Link: https://lkml.kernel.org/r/20180228102846.13447-3-bp@alien8.de
+---
+ arch/x86/kernel/cpu/microcode/intel.c | 27 ++++++++++++++++++++++++---
+ 1 file changed, 24 insertions(+), 3 deletions(-)
+
+diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
+index 923054a..87bd6dc 100644
+--- a/arch/x86/kernel/cpu/microcode/intel.c
++++ b/arch/x86/kernel/cpu/microcode/intel.c
+@@ -589,6 +589,17 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
+ if (!mc)
+ return 0;
+
++ /*
++ * Save us the MSR write below - which is a particular expensive
++ * operation - when the other hyperthread has updated the microcode
++ * already.
++ */
++ rev = intel_get_microcode_revision();
++ if (rev >= mc->hdr.rev) {
++ uci->cpu_sig.rev = rev;
++ return UCODE_OK;
++ }
++
+ /* write microcode via MSR 0x79 */
+ native_wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
+
+@@ -776,7 +787,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
+ {
+ struct microcode_intel *mc;
+ struct ucode_cpu_info *uci;
+- struct cpuinfo_x86 *c;
++ struct cpuinfo_x86 *c = &cpu_data(cpu);
+ static int prev_rev;
+ u32 rev;
+
+@@ -793,6 +804,18 @@ static enum ucode_state apply_microcode_intel(int cpu)
+ return UCODE_NFOUND;
+ }
+
++ /*
++ * Save us the MSR write below - which is a particular expensive
++ * operation - when the other hyperthread has updated the microcode
++ * already.
++ */
++ rev = intel_get_microcode_revision();
++ if (rev >= mc->hdr.rev) {
++ uci->cpu_sig.rev = rev;
++ c->microcode = rev;
++ return UCODE_OK;
++ }
++
+ /* write microcode via MSR 0x79 */
+ wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
+
+@@ -813,8 +836,6 @@ static enum ucode_state apply_microcode_intel(int cpu)
+ prev_rev = rev;
+ }
+
+- c = &cpu_data(cpu);
+-
+ uci->cpu_sig.rev = rev;
+ c->microcode = rev;
+
+--
+cgit v1.1
+
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