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x86/microcode: Update the new microcode revision unconditionally

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Handle the case where microcode gets loaded on the BSP's hyperthread
sibling first and the boot_cpu_data's microcode revision doesn't get
updated because of early exit due to the siblings sharing a microcode
engine.

For that, simply write the updated revision on all CPUs unconditionally.

Signed-off-by: Filippo Sironi <sironi@amazon.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: prarit@redhat.com
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1533050970-14385-1-git-send-email-sironi@amazon.de
This commit is contained in:
Filippo Sironi 2018-07-31 17:29:30 +02:00 committed by Thomas Gleixner
parent 370a132bb2
commit 8da38ebaad
2 changed files with 21 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
arch/x86/kernel/cpu/microcode/amd.c
View File

@ -504,6 +504,7 @@ static enum ucode_state apply_microcode_amd(int cpu)
struct microcode_amd *mc_amd;
struct ucode_cpu_info *uci;
struct ucode_patch *p;
enum ucode_state ret;
u32 rev, dummy;
BUG_ON(raw_smp_processor_id() != cpu);
@ -521,9 +522,8 @@ static enum ucode_state apply_microcode_amd(int cpu)
/* need to apply patch? */
if (rev >= mc_amd->hdr.patch_id) {
c->microcode = rev;
uci->cpu_sig.rev = rev;
return UCODE_OK;
ret = UCODE_OK;
goto out;
}
if (__apply_microcode_amd(mc_amd)) {
@ -531,17 +531,21 @@ static enum ucode_state apply_microcode_amd(int cpu)
cpu, mc_amd->hdr.patch_id);
return UCODE_ERROR;
}
pr_info("CPU%d: new patch_level=0x%08x\n", cpu,
mc_amd->hdr.patch_id);
uci->cpu_sig.rev = mc_amd->hdr.patch_id;
c->microcode = mc_amd->hdr.patch_id;
rev = mc_amd->hdr.patch_id;
ret = UCODE_UPDATED;
pr_info("CPU%d: new patch_level=0x%08x\n", cpu, rev);
out:
uci->cpu_sig.rev = rev;
c->microcode = rev;
/* Update boot_cpu_data's revision too, if we're on the BSP: */
if (c->cpu_index == boot_cpu_data.cpu_index)
boot_cpu_data.microcode = mc_amd->hdr.patch_id;
boot_cpu_data.microcode = rev;
return UCODE_UPDATED;
return ret;
}
static int install_equiv_cpu_table(const u8 *buf)

11
arch/x86/kernel/cpu/microcode/intel.c
View File

@ -795,6 +795,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
struct cpuinfo_x86 *c = &cpu_data(cpu);
struct microcode_intel *mc;
enum ucode_state ret;
static int prev_rev;
u32 rev;
@ -817,9 +818,8 @@ static enum ucode_state apply_microcode_intel(int cpu)
*/
rev = intel_get_microcode_revision();
if (rev >= mc->hdr.rev) {
uci->cpu_sig.rev = rev;
c->microcode = rev;
return UCODE_OK;
ret = UCODE_OK;
goto out;
}
/*
@ -848,6 +848,9 @@ static enum ucode_state apply_microcode_intel(int cpu)
prev_rev = rev;
}
ret = UCODE_UPDATED;
out:
uci->cpu_sig.rev = rev;
c->microcode = rev;
@ -855,7 +858,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
if (c->cpu_index == boot_cpu_data.cpu_index)
boot_cpu_data.microcode = rev;
return UCODE_UPDATED;
return ret;
}
static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,