Messages in this thread | | | Date | Wed, 25 May 2022 12:03:52 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH 3/3] x86/microcode: Taint and warn on late loading |
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On Tue, May 24, 2022 at 08:53:24PM +0200, Borislav Petkov wrote: > From: Borislav Petkov <bp@suse.de> > > Warn when done and taint the kernel. > > Signed-off-by: Borislav Petkov <bp@suse.de> > --- > arch/x86/kernel/cpu/microcode/core.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c > index c717db6b6856..f7ded2facaa0 100644 > --- a/arch/x86/kernel/cpu/microcode/core.c > +++ b/arch/x86/kernel/cpu/microcode/core.c > @@ -501,6 +501,8 @@ static int microcode_reload_late(void) > microcode_check(); > > pr_info("Reload completed, microcode revision: 0x%x\n", boot_cpu_data.microcode); > + pr_err("However, late loading is dangerous and it taints the kernel.\n" > + "You should switch to early loading, if possible.\n");
Should we not warn *before* attempting the ucode update? Should the whole thing come unstuck, you at least have some clue.
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