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From: Thomas Gleixner <tglx@linutronix.de>
To: "Jörg Otte" <jrg.otte@gmail.com>
Cc: kirill.shutemov@linux.intel.com,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Borislav Petkov <bp@alien8.de>
Subject: Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.
Date: Tue, 1 May 2018 20:27:24 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.21.1805012025460.1596@nanos.tec.linutronix.de> (raw)
In-Reply-To: <alpine.DEB.2.21.1805011458390.1596@nanos.tec.linutronix.de>

[-- Attachment #1: Type: text/plain, Size: 1011 bytes --]

On Tue, 1 May 2018, Thomas Gleixner wrote:
> On Tue, 1 May 2018, Jörg Otte wrote:
> > 2018-04-30 21:53 GMT+02:00 Thomas Gleixner <tglx@linutronix.de>:
> > > --- a/arch/x86/kernel/cpu/common.c
> > > +++ b/arch/x86/kernel/cpu/common.c
> > > @@ -848,6 +848,11 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
> > >                 c->x86_power = edx;
> > >         }
> > >
> > > +       if (c->extended_cpuid_level >= 0x80000008) {
> > > +               cpuid(0x80000008, &eax, &ebx, &ecx, &edx);
> > > +               c->x86_capability[CPUID_8000_0008_EBX] = ebx;
> > > +       }
> > > +
> > >         if (c->extended_cpuid_level >= 0x8000000a)
> > >                 c->x86_capability[CPUID_8000_000A_EDX] = cpuid_edx(0x8000000a);
> > >
> > 
> > No, does not fix it.
> 
> Then I really have no idea how reverting the patch you pointed out would
> fix it.

Can you please carefully recheck:

1) rc3 with d94a155c59c9 reverted.

2) rc3 with the above patch applied.

If #1 works then #2 must work as well.

Thanks,

	tglx

  reply	other threads:[~2018-05-01 18:27 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-30 15:59 Jörg Otte
2018-04-30 19:53 ` Thomas Gleixner
2018-05-01  7:39   ` Jörg Otte
2018-05-01 12:59     ` Thomas Gleixner
2018-05-01 18:27       ` Thomas Gleixner [this message]
2018-05-01 23:07         ` Tim Chen
2018-05-01 20:14       ` Linus Torvalds
2018-05-02  7:43         ` Jörg Otte
2018-05-02  9:02           ` Thomas Gleixner
2018-05-02  9:25             ` Jörg Otte
2018-05-02 12:20               ` Thomas Gleixner
2018-05-04 16:18                 ` Borislav Petkov
2018-05-05  9:47                   ` Jörg Otte
2018-05-05  9:53                     ` Borislav Petkov
2018-05-02 14:48             ` [tip:x86/urgent] x86/cpu: Restore CPUID_8000_0008_EBX reload tip-bot for Thomas Gleixner
2018-05-02 18:08               ` Tim Chen

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