From mboxrd@z Thu Jan  1 00:00:00 1970
From: Borislav Petkov <bp@alien8.de>
Subject: Re: [tip:x86/fpu] x86/fpu: Don't export __kernel_fpu_{begin,end}()
Date: Mon, 3 Dec 2018 23:08:41 +0100
Message-ID: <20181203220841.GB4794@zn.tnic>
References: <20181129150210.2k4mawt37ow6c2vq@linutronix.de>
 <tip-7d79adb87fa79e4a4c59424fd5b5a922861fc5f6@git.kernel.org>
 <CAKv+Gu-s59fSWrMevmbJWyBtNVYLkF7FATALGBD470CWsN9C1Q@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <CAKv+Gu-s59fSWrMevmbJWyBtNVYLkF7FATALGBD470CWsN9C1Q@mail.gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>, Ingo Molnar <mingo@redhat.com>, the arch/x86 maintainers <x86@kernel.org>, nstange@suse.de, Rik van Riel <riel@surriel.com>, KVM devel mailing list <kvm@vger.kernel.org>, "Jason A. Donenfeld" <Jason@zx2c4.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@kernel.org>, Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>, Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@suse.de>, linux-efi <linux-efi@vger.kernel.org>, Paolo Bonzini <pbonzini@redhat.com>, linux-tip-commits@vger.kernel.org
List-Id: linux-efi@vger.kernel.org

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.