From: Ingo Molnar <mingo@elte.hu>
To: Zachary Amsden <zach@vmware.com>
Cc: Andrew Morton <akpm@osdl.org>, Chris Wright <chrisw@osdl.org>,
Linus Torvalds <torvalds@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Virtualization Mailing List <virtualization@lists.osdl.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Martin Bligh <mbligh@mbligh.org>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH 4/21] i386 Broken bios common
Date: Tue, 8 Nov 2005 13:57:09 +0100 [thread overview]
Message-ID: <20051108125709.GA4218@elte.hu> (raw)
In-Reply-To: <43709E86.8010203@vmware.com>
* Zachary Amsden <zach@vmware.com> wrote:
> >>- gdt[0x40 / 8] = bad_bios_desc;
> >>+ gdt[0x40 / 8] = gdt[GDT_ENTRY_BAD_BIOS_CACHE];
> >
> >i like the cleanup, but wouldnt it be simpler to dedicate GDT entry #8
> >to the 0x40 descriptor, and hence be compatible with such broken BIOSes
> >by default? Right now entry #8 is taken up by TLS segment #2, but we
> >could change GDT_ENTRY_TLS_MIN from 6 to 9 and push the TLS segments to
> >entries 9,10,11. [ Could there be any buggy SMM code that relies on
> >having something at 0x40? ]
>
> I worry that there could be buggy userspace code that relies on having
> selector 0x40 - notably Wine. So although I would like to make 0x40
> the default, can't be guaranteed.
why use up a GDT entry then for GDT_ENTRY_BAD_BIOS_CACHE? Just put it
into a global variable, into the readmostly section.
Ingo
next prev parent reply other threads:[~2005-11-08 12:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-08 4:22 Zachary Amsden
2005-11-08 7:19 ` Ingo Molnar
2005-11-08 12:48 ` Zachary Amsden
2005-11-08 12:57 ` Ingo Molnar [this message]
2005-11-08 15:06 ` Linus Torvalds
2005-11-08 15:16 ` H. Peter Anvin
2005-11-08 21:07 ` Zachary Amsden
2005-11-08 21:52 ` Zachary Amsden
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