Commit-ID: 02ecc41abcea4ff9291d548f6f846b29b354ddd2 Gitweb: http://git.kernel.org/tip/02ecc41abcea4ff9291d548f6f846b29b354ddd2 Author: Borislav Petkov <[email protected]> AuthorDate: Sun, 30 Nov 2014 14:26:39 +0100 Committer: Thomas Gleixner <[email protected]> CommitDate: Mon, 1 Dec 2014 10:55:08 +0100
x86, microcode: Limit the microcode reloading to 64-bit for now First, there was this: https://bugzilla.kernel.org/show_bug.cgi?id=88001 The problem there was that microcode patches are not being reapplied after suspend-to-ram. It was important to reapply them, though, because of for example Haswell's TSX erratum which disabled TSX instructions with a microcode patch. A simple fix was fb86b97300d9 ("x86, microcode: Update BSPs microcode on resume") but, as it is often the case, simple fixes are too simple. This one causes 32-bit resume to fail: https://bugzilla.kernel.org/show_bug.cgi?id=88391 Properly fixing this would require more involved changes for which it is too late now, right before the merge window. Thus, limit this to 64-bit only temporarily. Signed-off-by: Borislav Petkov <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]> --- arch/x86/kernel/cpu/microcode/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index 2ce9051..08fe6e8 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -465,6 +465,7 @@ static void mc_bp_resume(void) if (uci->valid && uci->mc) microcode_ops->apply_microcode(cpu); +#ifdef CONFIG_X86_64 else if (!uci->mc) /* * We might resume and not have applied late microcode but still @@ -473,6 +474,7 @@ static void mc_bp_resume(void) * applying patches early on the APs. */ load_ucode_ap(); +#endif } static struct syscore_ops mc_syscore_ops = { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
