From: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
To: qemu-devel@nongnu.org
Cc: bochs-developers@lists.sourceforge.net
Subject: Re: [Qemu-devel] [PATCH v5 0/5] Support for S3 ACPI state (suspend to memory) in BIOS
Date: Thu, 27 Nov 2008 13:17:16 +0100 [thread overview]
Message-ID: <492E8FCC.2020203@gmx.net> (raw)
In-Reply-To: <20081127110220.25353.83454.stgit@dhcp-1-237.tlv.redhat.com>
Hi,
On 27.11.2008 12:02, Gleb Natapov wrote:
> This patch series adds S3 (suspend to RAM) ACPI state to BIOS. Most
> changes concern themselves with preventing BIOS from using memory
> locations available to a guest OS.
>
I see the problem you're facing with the overwrite and it looks there
might be a cleaner solution: If you can lock the CPU cache so that
writes don't get passed through to RAM, you're free to use any area
(with a few contraints) for stack without having to worry about
clobbering memory contents there.
That method is called Cache-as-RAM and I'm currently trying to implement
it in Qemu. I haven't looked into Bochs yet, but it should be doable
there as well.
coreboot (a free x86 firmware/BIOS replacement) is using Cache-as-RAM
and I believe quite a few commercial BIOSes use that technique as well.
Regards,
Carl-Daniel
next prev parent reply other threads:[~2008-11-27 12:17 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-27 11:02 [Qemu-devel] [PATCH v5 0/5] Support for S3 ACPI state (suspend to memory) in BIOS Gleb Natapov
2008-11-27 11:02 ` [Qemu-devel] [PATCH v5 1/5] Add S3 state to DSDT. Handle resume event in the BIOS Gleb Natapov
2008-12-07 2:57 ` [Qemu-devel] Re: [Bochs-developers] " Kevin O'Connor
2008-12-07 9:20 ` Gleb Natapov
2008-12-07 15:10 ` Kevin O'Connor
2008-12-07 16:31 ` Gleb Natapov
2008-12-09 22:26 ` [Qemu-devel] Re: [Bochs-developers] [PATCH v5 1/5] Add S3 state to DSDT.Handle " Sebastian Herbszt
2008-12-10 0:06 ` Kevin O'Connor
2008-12-10 10:22 ` Gleb Natapov
2008-12-09 13:38 ` [Qemu-devel] Re: [Bochs-developers] [PATCH v5 1/5] Add S3 state to DSDT. Handle " Gleb Natapov
2008-12-09 15:12 ` [Qemu-devel] " Stanislav
2008-12-14 22:02 ` [Qemu-devel] Re: [Bochs-developers] [PATCH v5 1/5] Add S3 state to DSDT.Handle " Sebastian Herbszt
2008-11-27 11:02 ` [Qemu-devel] [PATCH v5 2/5] Preserve memory content during SMM init Gleb Natapov
2008-11-27 11:02 ` [Qemu-devel] [PATCH v5 3/5] Execute rombios32 code from rom address 0xe0000 Gleb Natapov
2008-11-27 11:02 ` [Qemu-devel] [PATCH v5 4/5] Don't use unreserved memory in BIOS Gleb Natapov
2008-11-27 11:02 ` [Qemu-devel] [PATCH v5 5/5] Don't power down vga card on entering S3 state Gleb Natapov
2008-11-27 12:17 ` Carl-Daniel Hailfinger [this message]
2008-11-27 12:35 ` [Qemu-devel] [PATCH v5 0/5] Support for S3 ACPI state (suspend to memory) in BIOS Gleb Natapov
2008-11-27 18:59 ` [Bochs-developers] " Stanislav
2008-11-27 19:07 ` Carl-Daniel Hailfinger
2008-11-27 20:04 ` Stanislav
2008-11-27 21:04 ` Carl-Daniel Hailfinger
2008-11-29 19:42 ` Stanislav
2008-12-04 10:04 ` Carl-Daniel Hailfinger
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