Re: [tip:x86/fpu] x86/fpu: Don't export __kernel_fpu_{begin,end}()

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Subject: Re: [tip:x86/fpu] x86/fpu: Don't export __kernel_fpu_{begin,end}()
From: Borislav Petkov <bp@xxxxxxxxx>
Date: Mon, 3 Dec 2018 23:08:41 +0100
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, nstange@xxxxxxx, Rik van Riel <riel@xxxxxxxxxxx>, KVM devel mailing list <kvm@xxxxxxxxxxxxxxx>, "Jason A. Donenfeld" <Jason@xxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Radim Krčmář <rkrcmar@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, linux-efi <linux-efi@xxxxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx
In-reply-to: <CAKv+Gu-s59fSWrMevmbJWyBtNVYLkF7FATALGBD470CWsN9C1Q@mail.gmail.com>
References: <20181129150210.2k4mawt37ow6c2vq@linutronix.de> <tip-7d79adb87fa79e4a4c59424fd5b5a922861fc5f6@git.kernel.org> <CAKv+Gu-s59fSWrMevmbJWyBtNVYLkF7FATALGBD470CWsN9C1Q@mail.gmail.com>
User-agent: Mutt/1.10.1 (2018-07-13)

On Mon, Dec 03, 2018 at 10:12:19PM +0100, Ard Biesheuvel wrote:
> > + * Using the FPU in hardirq is not allowed.
> 
> According to the documentation in x86/kernel/fpu/core.c, this is not
> true. So which one is accurate?

I think you mean the irq from user mode... Yap, we do allow that.

Sebastian?

Thx.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

Follow-Ups:
- Re: [tip:x86/fpu] x86/fpu: Don't export __kernel_fpu_{begin,end}()
  - From: Sebastian Andrzej Siewior
- Re: [tip:x86/fpu] x86/fpu: Don't export __kernel_fpu_{begin,end}()
  - From: Borislav Petkov

References:
- [tip:x86/fpu] x86/fpu: Don't export __kernel_fpu_{begin,end}()
  - From: tip-bot for Sebastian Andrzej Siewior
- Re: [tip:x86/fpu] x86/fpu: Don't export __kernel_fpu_{begin,end}()
  - From: Ard Biesheuvel

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