From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
Evgeniy Baskov <baskov@ispras.ru>, Borislav Petkov <bp@alien8.de>,
Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Alexey Khoroshilov <khoroshilov@ispras.ru>,
Peter Jones <pjones@redhat.com>,
Gerd Hoffmann <kraxel@redhat.com>, Dave Young <dyoung@redhat.com>,
Mario Limonciello <mario.limonciello@amd.com>,
Kees Cook <keescook@chromium.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH v2 07/20] x86: decompressor: Only call the trampoline when changing paging levels
Date: Mon, 15 May 2023 17:07:35 +0300 [thread overview]
Message-ID: <20230515140735.lw7vjxiv4wsj7pk3@box.shutemov.name> (raw)
In-Reply-To: <20230508070330.582131-8-ardb@kernel.org>
On Mon, May 08, 2023 at 09:03:17AM +0200, Ard Biesheuvel wrote:
> Since we know the current and desired number of paging levels when
> preparing the trampoline, let's not call the trampoline at all when we
> know that calling it is not going to result in a change to the number of
> paging levels. Given that we are already running in long mode, the PAE
> and LA57 settings are necessarily consistent with the currently active
> page tables - the only difference is that we will always preserve
> CR4.MCE in this case, but this will be cleared by the real kernel
> startup code if CONFIG_X86_MCE is not enabled.
>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2023-05-15 14:07 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-08 7:03 [PATCH v2 00/20] efi/x86: Avoid bare metal decompressor during EFI boot Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 01/20] x86: decompressor: Use proper sequence to take the address of the GOT Ard Biesheuvel
2023-05-17 17:31 ` Borislav Petkov
2023-05-17 17:39 ` Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 02/20] x86: decompressor: Store boot_params pointer in callee save register Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 03/20] x86: decompressor: Call trampoline as a normal function Ard Biesheuvel
2023-05-15 13:59 ` Kirill A. Shutemov
2023-05-08 7:03 ` [PATCH v2 04/20] x86: decompressor: Use standard calling convention for trampoline Ard Biesheuvel
2023-05-15 14:00 ` Kirill A. Shutemov
2023-05-08 7:03 ` [PATCH v2 05/20] x86: decompressor: Avoid the need for a stack in the 32-bit trampoline Ard Biesheuvel
2023-05-15 14:03 ` Kirill A. Shutemov
2023-05-17 22:40 ` Tom Lendacky
2023-05-18 14:55 ` Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 06/20] x86: decompressor: Call trampoline directly from C code Ard Biesheuvel
2023-05-15 14:05 ` Kirill A. Shutemov
2023-05-08 7:03 ` [PATCH v2 07/20] x86: decompressor: Only call the trampoline when changing paging levels Ard Biesheuvel
2023-05-15 14:07 ` Kirill A. Shutemov [this message]
2023-05-08 7:03 ` [PATCH v2 08/20] x86: decompressor: Merge trampoline cleanup with switching code Ard Biesheuvel
[not found] ` <20230515140955.d4adbstv6gtnshp2@box.shutemov.name>
2023-05-16 17:50 ` Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 09/20] x86: efistub: Perform 4/5 level paging switch from the stub Ard Biesheuvel
2023-05-15 14:14 ` Kirill A. Shutemov
2023-05-16 17:53 ` Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 10/20] x86: efistub: Prefer EFI memory attributes protocol over DXE services Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 11/20] decompress: Use 8 byte alignment Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 12/20] x86: decompressor: Move global symbol references to C code Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 13/20] x86: decompressor: Factor out kernel decompression and relocation Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 14/20] x86: head_64: Store boot_params pointer in callee-preserved register Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 15/20] x86: head_64: Switch to kernel CS before enabling memory encryption Ard Biesheuvel
2023-05-17 18:54 ` Tom Lendacky
2023-05-08 7:03 ` [PATCH v2 16/20] efi: libstub: Add limit argument to efi_random_alloc() Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 17/20] x86: efistub: Check SEV/SNP support while running in the firmware Ard Biesheuvel
2023-05-18 20:16 ` Tom Lendacky
2023-05-18 22:27 ` Ard Biesheuvel
2023-05-19 14:04 ` Tom Lendacky
2023-05-22 12:48 ` Joerg Roedel
2023-05-22 13:07 ` Ard Biesheuvel
2023-05-22 13:35 ` Joerg Roedel
2023-05-08 7:03 ` [PATCH v2 18/20] x86: efistub: Avoid legacy decompressor when doing EFI boot Ard Biesheuvel
2023-05-18 20:48 ` Tom Lendacky
2023-05-18 22:33 ` Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 19/20] x86: efistub: Clear BSS in EFI handover protocol entrypoint Ard Biesheuvel
2023-05-08 7:03 ` [PATCH v2 20/20] x86: decompressor: Avoid magic offsets for EFI handover entrypoint Ard Biesheuvel
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