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x86/microcode/AMD: Fix mixed steppings support

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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: fe055896c0 ("x86/microcode: Merge the early microcode loader")
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org> # 2355370cd9 ("x86/microcode/amd: Remove load_microcode_amd()'s bsp parameter")
Cc: <stable@kernel.org> # a5ad92134b ("x86/microcode/AMD: Add a @cpu parameter to the reloading functions")
Link: https://lore.kernel.org/r/20230130161709.11615-4-bp@alien8.de
This commit is contained in:
Borislav Petkov (AMD) 2023-01-26 16:26:17 +01:00
parent a5ad92134b
commit 7ff6edf4fe
1 changed files with 21 additions and 13 deletions
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34
arch/x86/kernel/cpu/microcode/amd.c
View file

@ -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
@ -428,7 +430,7 @@ static bool early_apply_microcode(u32 cpuid_1_eax, void *ucode, size_t size, boo
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;
@ -580,10 +582,10 @@ 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 __always_unused;
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);
@ -852,6 +854,8 @@ 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;
@ -864,18 +868,22 @@ 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;
}