From: Ingo Molnar <mingo@elte.hu>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] xen64: disable 32-bit syscall/sysenter if not supported.
Date: Fri, 11 Jul 2008 15:47:06 +0200 [thread overview]
Message-ID: <20080711134706.GB32159@elte.hu> (raw)
In-Reply-To: <48769A18.4030402@goop.org>
* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> Old versions of Xen (3.1 and before) don't support sysenter or syscall
> from 32-bit compat userspaces. If we can't set the appropriate
> syscall callback, then disable the corresponding feature bit, which
> will cause the vdso32 setup to fall back appropriately.
>
> Linux assumes that syscall is always available to 32-bit userspace,
> and installs it by default if sysenter isn't available. In that case,
> we just disable vdso altogether, forcing userspace libc to fall back
> to int $0x80.
merged the latest version of tip/x86/core to tip/xen-64bit and then
added this patch to tip/xen-64bit - thanks Jeremy.
Ingo
prev parent reply other threads:[~2008-07-11 13:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-10 23:24 Jeremy Fitzhardinge
2008-07-11 13:47 ` Ingo Molnar [this message]
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