From: Evalds Iodzevics <evalds.iodzevics@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: gregkh@linuxfoundation.org, tglx@linutronix.de,
Evalds Iodzevics <evalds.iodzevics@gmail.com>
Subject: [PATCH] x86/microcode/intel: replace sync_core() with native_cpuid_reg(eax)
Date: Mon, 20 Apr 2020 15:00:37 +0300 [thread overview]
Message-ID: <20200420120037.1537-1-evalds.iodzevics@gmail.com> (raw)
sync_core() always jums past cpuid instruction on 32 bit machines
because data structure boot_cpu_data are not populated so early in boot.
It depends on commit 5dedade6dfa243c130b85d1e4daba6f027805033 for
native_cpuid_reg(eax) definitions
This patch is for 4.4 but also should apply to 4.9
Signed-off-by: Evalds Iodzevics <evalds.iodzevics@gmail.com>
---
arch/x86/include/asm/microcode_intel.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/microcode_intel.h b/arch/x86/include/asm/microcode_intel.h
index 90343ba50485..92ce9c8a508b 100644
--- a/arch/x86/include/asm/microcode_intel.h
+++ b/arch/x86/include/asm/microcode_intel.h
@@ -60,7 +60,7 @@ static inline u32 intel_get_microcode_revision(void)
native_wrmsrl(MSR_IA32_UCODE_REV, 0);
/* As documented in the SDM: Do a CPUID 1 here */
- sync_core();
+ native_cpuid_eax(1);
/* get the current revision from MSR 0x8B */
native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev);
--
2.17.4
next reply other threads:[~2020-04-20 9:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-20 12:00 Evalds Iodzevics [this message]
2020-04-20 9:31 ` [PATCH] x86/microcode/intel: replace sync_core() with native_cpuid_reg(eax) Borislav Petkov
2020-04-20 13:33 ` Ben Hutchings
2020-04-20 14:01 ` Evalds Iodzevics
2020-04-20 9:57 ` Greg KH
2020-04-21 8:53 ` [PATCH v2] " Evalds Iodzevics
2020-04-21 5:59 ` Greg KH
2020-04-21 6:41 ` Evalds Iodzevics
2020-04-21 7:19 ` Greg KH
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