From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Ian Campbell <Ian.Campbell@eu.citrix.com>
Cc: "randy.dunlap@oracle.com" <randy.dunlap@oracle.com>,
Jeremy Fitzhardinge <Jeremy.Fitzhardinge@citrix.com>,
"eric.dumazet@gmail.com" <eric.dumazet@gmail.com>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
David Miller <davem@davemloft.net>,
"mirq-linux@rere.qmqm.pl" <mirq-linux@rere.qmqm.pl>,
"mingo@redhat.com" <mingo@redhat.com>,
"hpa@zytor.com" <hpa@zytor.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"pazke@donpac.ru" <pazke@donpac.ru>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: [PATCH] xen: drop anti-dependency on X86_VISWS
Date: Fri, 08 Apr 2011 08:25:50 -0700 [thread overview]
Message-ID: <4D9F28FE.9000803@goop.org> (raw)
In-Reply-To: <1302244694.31620.44.camel@localhost.localdomain>
On 04/07/2011 11:38 PM, Ian Campbell wrote:
>> Not really. The TSC register is a requirement, but that's going to be
>> present on any CPU which can boot Xen. We don't need any of the
>> kernel's TSC machinery though.
> So why the Kconfig dependency then? In principal a kernel compiled for a
> non-TSC processor (which meets the other requirements for Xen, such as
> PAE support) will run just fine under Xen on a newer piece of hardware.
Not sure where it came from. It was probably never needed, or just
added for some secondary effect we wanted.
> Is there any downside to this patch (is X86_CMPXCHG in the same sort of
> boat?)
Only if we don't use cmpxchg in shared memory with other domains or the
hypervisor. (I don't think it will dynamically switch between real and
emulated cmpxchg depending on availability.)
J
next prev parent reply other threads:[~2011-04-08 15:25 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-31 11:01 [PATCH RESEND] net: convert xen-netfront to hw_features Michał Mirosław
2011-03-31 11:13 ` Ian Campbell
2011-03-31 11:13 ` Ian Campbell
2011-03-31 11:37 ` Michał Mirosław
2011-03-31 11:37 ` Michał Mirosław
2011-04-02 3:54 ` David Miller
2011-04-02 3:54 ` David Miller
2011-04-03 11:07 ` [PATCH] xen: netfront: fix declaration order Eric Dumazet
2011-04-03 11:07 ` Eric Dumazet
2011-04-03 17:35 ` Michał Mirosław
2011-04-03 17:35 ` Michał Mirosław
2011-04-04 0:24 ` David Miller
2011-04-04 9:55 ` [PATCH] xen: drop anti-dependency on X86_VISWS (Was: Re: [PATCH] xen: netfront: fix declaration order) Ian Campbell
2011-04-04 9:55 ` Ian Campbell
2011-04-06 21:45 ` [PATCH] xen: drop anti-dependency on X86_VISWS David Miller
2011-04-06 21:45 ` David Miller
2011-04-07 6:58 ` Ian Campbell
2011-04-07 6:58 ` Ian Campbell
2011-04-07 17:00 ` H. Peter Anvin
2011-04-07 17:00 ` H. Peter Anvin
2011-04-08 6:46 ` Ian Campbell
2011-04-08 6:46 ` Ian Campbell
2011-04-08 20:15 ` H. Peter Anvin
2011-04-08 20:15 ` H. Peter Anvin
2011-04-08 20:37 ` [tip:x86/cpu] x86, cpu: Move AMD Elan Kconfig under "Processor family" tip-bot for Ian Campbell
2011-04-07 18:07 ` [PATCH] xen: drop anti-dependency on X86_VISWS Jeremy Fitzhardinge
2011-04-08 6:38 ` Ian Campbell
2011-04-08 15:25 ` Jeremy Fitzhardinge [this message]
2011-04-08 15:42 ` Jan Beulich
2011-04-08 18:24 ` [Xen-devel] " Jeremy Fitzhardinge
2011-04-08 18:24 ` Jeremy Fitzhardinge
2011-04-09 10:34 ` [Xen-devel] " Ian Campbell
2011-04-09 10:34 ` Ian Campbell
2011-04-14 8:20 ` [Xen-devel] " Jeremy Fitzhardinge
2011-04-14 8:20 ` Jeremy Fitzhardinge
2011-04-08 15:42 ` [Xen-devel] " Jan Beulich
2011-04-08 15:25 ` Jeremy Fitzhardinge
2011-04-08 6:38 ` Ian Campbell
2011-04-07 18:07 ` Jeremy Fitzhardinge
2011-04-04 0:24 ` [PATCH] xen: netfront: fix declaration order David Miller
2011-04-04 12:29 ` [PATCH RESEND] net: convert xen-netfront to hw_features Ian Campbell
2011-04-04 18:08 ` David Miller
2011-04-04 18:08 ` David Miller
2011-04-04 12:29 ` Ian Campbell
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