From: Borislav Petkov <bp@suse.de>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirski <luto@amacapital.net>,
Cyrill Gorcunov <gorcunov@openvz.org>,
Andi Kleen <ak@linux.intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCHv3 2/5] x86/boot/compressed/64: Print error if 5-level paging is not supported
Date: Mon, 4 Dec 2017 20:31:07 +0100 [thread overview]
Message-ID: <20171204193107.ni42cydrxp5utg3n@pd.tnic> (raw)
In-Reply-To: <20171204124059.63515-3-kirill.shutemov@linux.intel.com>
On Mon, Dec 04, 2017 at 03:40:56PM +0300, Kirill A. Shutemov wrote:
> We cannot proceed booting if the machine doesn't support the paging mode
> kernel was compiled for.
>
> Getting error the usual way -- via validate_cpu() -- is not going to
> work. We need to enable appropriate paging mode before that, otherwise
> kernel would triple-fault during KASLR setup.
>
> This code will go away once we get support for boot-time switching
> between paging modes.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: <stable@vger.kernel.org> [4.14+]
> ---
> arch/x86/boot/compressed/misc.c | 16 ++++++++++++++++
> arch/x86/boot/compressed/pgtable_64.c | 2 +-
> 2 files changed, 17 insertions(+), 1 deletion(-)
Reported-and-tested-by: Borislav Petkov <bp@suse.de>
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix ImendA?rffer, Jane Smithard, Graham Norton, HRB 21284 (AG NA 1/4 rnberg)
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next prev parent reply other threads:[~2017-12-04 19:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-04 12:40 [PATCHv3 0/5] x86: 5-level related changes into decompression code Kirill A. Shutemov
2017-12-04 12:40 ` [PATCHv3 1/5] x86/boot/compressed/64: Detect and handle 5-level paging at boot-time Kirill A. Shutemov
2017-12-04 20:29 ` Thomas Gleixner
2017-12-04 21:15 ` Kirill A. Shutemov
2017-12-04 12:40 ` [PATCHv3 2/5] x86/boot/compressed/64: Print error if 5-level paging is not supported Kirill A. Shutemov
2017-12-04 19:31 ` Borislav Petkov [this message]
2017-12-04 12:40 ` [PATCHv3 3/5] x86/boot/compressed/64: Rename pagetable.c to kaslr_64.c Kirill A. Shutemov
2017-12-04 12:40 ` [PATCHv3 4/5] x86/boot/compressed/64: Introduce place_trampoline() Kirill A. Shutemov
2017-12-04 12:40 ` [PATCHv3 5/5] x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G Kirill A. Shutemov
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