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x86/microcode/AMD: Fix mixed steppings support

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commit 7ff6edf4fef38ab404ee7861f257e28eaaeed35f upstream.

The AMD side of the loader has always claimed to support mixed
steppings. But somewhere along the way, it broke that by assuming that
the cached patch blob is a single one instead of it being one per
*node*.

So turn it into a per-node one so that each node can stash the blob
relevant for it.

  [ NB: Fixes tag is not really the exactly correct one but it is good
    enough. ]

Fixes: fe055896c040 ("x86/microcode: Merge the early microcode loader")
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org> # 2355370cd941 ("x86/microcode/amd: Remove load_microcode_amd()'s bsp parameter")
Cc: <stable@kernel.org> # a5ad92134bd1 ("x86/microcode/AMD: Add a @cpu parameter to the reloading functions")
Link: https://lore.kernel.org/r/20230130161709.11615-4-bp@alien8.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov (AMD) 2023-01-26 16:26:17 +01:00 committed by Greg Kroah-Hartman
parent 727bc2c285
commit 979e197968
1 changed files with 21 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
arch/x86/kernel/cpu/microcode/amd.c
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@ -55,7 +55,9 @@ struct cont_desc {
};
static u32 ucode_new_rev;
static u8 amd_ucode_patch[PATCH_MAX_SIZE];
/* One blob per node. */
static u8 amd_ucode_patch[MAX_NUMNODES][PATCH_MAX_SIZE];
/*
* Microcode patch container file is prepended to the initrd in cpio
@ -429,7 +431,7 @@ apply_microcode_early_amd(u32 cpuid_1_eax, void *ucode, size_t size, bool save_p
patch = (u8 (*)[PATCH_MAX_SIZE])__pa_nodebug(&amd_ucode_patch);
#else
new_rev = &ucode_new_rev;
patch = &amd_ucode_patch;
patch = &amd_ucode_patch[0];
#endif
desc.cpuid_1_eax = cpuid_1_eax;
@ -575,10 +577,10 @@ int __init save_microcode_in_initrd_amd(unsigned int cpuid_1_eax)
void reload_ucode_amd(unsigned int cpu)
{
struct microcode_amd *mc;
u32 rev, dummy;
struct microcode_amd *mc;
mc = (struct microcode_amd *)amd_ucode_patch;
mc = (struct microcode_amd *)amd_ucode_patch[cpu_to_node(cpu)];
rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
@ -846,6 +848,8 @@ static enum ucode_state __load_microcode_amd(u8 family, const u8 *data,
static enum ucode_state load_microcode_amd(u8 family, const u8 *data, size_t size)
{
struct cpuinfo_x86 *c;
unsigned int nid, cpu;
struct ucode_patch *p;
enum ucode_state ret;
@ -858,18 +862,22 @@ static enum ucode_state load_microcode_amd(u8 family, const u8 *data, size_t siz
return ret;
}
p = find_patch(0);
if (!p) {
return ret;
} else {
if (boot_cpu_data.microcode >= p->patch_id)
return ret;
for_each_node(nid) {
cpu = cpumask_first(cpumask_of_node(nid));
c = &cpu_data(cpu);
p = find_patch(cpu);
if (!p)
continue;
if (c->microcode >= p->patch_id)
continue;
ret = UCODE_NEW;
}
memset(amd_ucode_patch, 0, PATCH_MAX_SIZE);
memcpy(amd_ucode_patch, p->data, min_t(u32, p->size, PATCH_MAX_SIZE));
memset(&amd_ucode_patch[nid], 0, PATCH_MAX_SIZE);
memcpy(&amd_ucode_patch[nid], p->data, min_t(u32, p->size, PATCH_MAX_SIZE));
}
return ret;
}