From: "Kirill A. Shutemov" <kirill@shutemov.name>
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>,
Borislav Petkov <bp@suse.de>, Andi Kleen <ak@linux.intel.com>,
Matthew Wilcox <willy@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv7 5/4] x86/boot/compressed/64: Support switching from 5- to 4-level paging
Date: Mon, 29 Jan 2018 18:39:45 +0300 [thread overview]
Message-ID: <20180129153945.sme6f2zx3fpj24qy@node.shutemov.name> (raw)
In-Reply-To: <20180129150758.81016-1-kirill.shutemov@linux.intel.com>
On Mon, Jan 29, 2018 at 06:07:58PM +0300, Kirill A. Shutemov wrote:
> + /*
> + * We are in 5-level paging mode, but we want to switch to 4-level.
> + * Let's take the first entry in the top-level page table as our new CR3.
> + */
> + movl %cr3, %eax
> + movl (%eax), %eax
> + movl %eax, %cr3
Aghh.. Please ignore this.
It would fail if CR3 points above 4G.
--
Kirill A. Shutemov
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next prev parent reply other threads:[~2018-01-29 15:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-29 11:53 [PATCHv7 0/4] x86: 5-level related changes into decompression code Kirill A. Shutemov
2018-01-29 11:53 ` [PATCHv7 1/4] x86/boot/compressed/64: Rename pagetable.c to kaslr_64.c Kirill A. Shutemov
2018-01-29 11:53 ` [PATCHv7 2/4] x86/boot/compressed/64: Introduce paging_prepare() Kirill A. Shutemov
2018-01-29 11:53 ` [PATCHv7 3/4] x86/boot/compressed/64: Prepare trampoline memory Kirill A. Shutemov
2018-01-29 11:53 ` [PATCHv7 4/4] x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G Kirill A. Shutemov
2018-01-29 15:07 ` [PATCHv7 5/4] x86/boot/compressed/64: Support switching from 5- to 4-level paging Kirill A. Shutemov
2018-01-29 15:39 ` Kirill A. Shutemov [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-01-30 13:52 [PATCHv8 0/4] x86: 5-level related changes into decompression code Kirill A. Shutemov
2018-01-30 13:52 ` [PATCHv7 5/4] x86/boot/compressed/64: Support switching from 5- to 4-level paging Kirill A. Shutemov
2018-01-30 13:56 ` Kirill A. Shutemov
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