From: Arvind Sankar <nivedita@alum.mit.edu>
To: "Mika Penttilä" <mika.penttila@nextfour.com>
Cc: Arvind Sankar <nivedita@alum.mit.edu>,
Ard Biesheuvel <ardb@kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/5] efi/x86: Remove extra headroom for setup block
Date: Mon, 2 Mar 2020 23:14:42 -0500 [thread overview]
Message-ID: <20200303041442.GA3518342@rani.riverdale.lan> (raw)
In-Reply-To: <db83f5a1-b827-2a31-0ca9-a04df8257324@nextfour.com>
On Mon, Mar 02, 2020 at 04:21:30AM +0000, Mika Penttilä wrote:
>
>
> On 2.3.2020 1.05, Arvind Sankar wrote:
> > commit 223e3ee56f77 ("efi/x86: add headroom to decompressor BSS to
> > account for setup block") added headroom to the PE image to account for
> > the setup block, which wasn't used for the decompression buffer.
> >
> > Now that we decompress from the start of the image, this is no longer
> > required.
> >
> > Add a check to make sure that the head section of the compressed kernel
> > won't overwrite itself while relocating. This is only for
> > future-proofing as with current limits on the setup and the actual size
> > of the head section, this can never happen.
> >
> > Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
>
> To make clear, the kernel (head_32.s and head_64.s) still relocates
> itself to the end of the buffer and does in-place decompression. So this
> is just to make init sz smaller.
>
>
Not init_size itself, but it reduces the size allocated for the PE
image. Do you want me to update the comment to make that clearer?
next prev parent reply other threads:[~2020-03-03 4:14 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-01 23:05 [PATCH 0/5] Minimize the need to move the kernel in the EFI stub Arvind Sankar
2020-03-01 23:05 ` [PATCH 1/5] x86/boot/compressed/32: Save the output address instead of recalculating it Arvind Sankar
2020-03-03 19:10 ` Ard Biesheuvel
2020-03-01 23:05 ` [PATCH 2/5] efi/x86: Decompress at start of PE image load address Arvind Sankar
2020-03-03 6:28 ` Mika Penttilä
2020-03-03 13:45 ` Arvind Sankar
2020-03-03 19:08 ` Ard Biesheuvel
2020-03-01 23:05 ` [PATCH 3/5] efi/x86: Add kernel preferred address to PE header Arvind Sankar
2020-03-03 19:11 ` Ard Biesheuvel
2020-03-01 23:05 ` [PATCH 4/5] efi/x86: Remove extra headroom for setup block Arvind Sankar
2020-03-02 4:21 ` Mika Penttilä
2020-03-03 4:14 ` Arvind Sankar [this message]
2020-03-01 23:05 ` [PATCH 5/5] efi/x86: Don't relocate the kernel unless necessary Arvind Sankar
2020-03-03 19:15 ` Ard Biesheuvel
2020-03-03 22:12 ` [PATCH v2 0/5] Minimize the need to move the kernel in the EFI stub Arvind Sankar
2020-03-03 22:12 ` [PATCH v2 1/5] x86/boot/compressed/32: Save the output address instead of recalculating it Arvind Sankar
2020-03-03 22:12 ` [PATCH v2 2/5] efi/x86: Decompress at start of PE image load address Arvind Sankar
2020-03-03 22:12 ` [PATCH v2 3/5] efi/x86: Add kernel preferred address to PE header Arvind Sankar
2020-03-03 22:12 ` [PATCH v2 4/5] efi/x86: Remove extra headroom for setup block Arvind Sankar
2020-05-11 17:01 ` Mike Lothian
2020-05-11 18:36 ` Arvind Sankar
2020-05-11 21:13 ` Ard Biesheuvel
2020-05-11 22:53 ` Arvind Sankar
2020-05-11 22:58 ` [PATCH] x86/boot: Mark global variables as static Arvind Sankar
2020-05-11 23:12 ` Mike Lothian
2020-05-12 11:05 ` Ard Biesheuvel
2020-03-03 22:12 ` [PATCH v2 5/5] efi/x86: Don't relocate the kernel unless necessary Arvind Sankar
2020-03-03 23:08 ` Ard Biesheuvel
2020-03-03 23:34 ` Arvind Sankar
2020-03-04 7:30 ` Ard Biesheuvel
2020-03-03 22:26 ` [PATCH v2 0/5] Minimize the need to move the kernel in the EFI stub Ard Biesheuvel
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