Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

2015-02-03 Thread David Vrabel
On 03/02/15 00:24, Luis R. Rodriguez wrote: As I waited I decided to finally install a 32-bit OS but I found now that as of Xen commit 5d1181a5 which went upstream as of xen 4.3 Xen no longer supports 32-bit for x86. You don't need a 32-bit hypervisor to run 32-bit dom0 or domUs. David --

Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

2015-02-02 Thread Luis R. Rodriguez
On Thu, Jan 29, 2015 at 12:35 PM, Luis R. Rodriguez mcg...@suse.com wrote: On Tue, Jan 27, 2015 at 10:06:44AM +, David Vrabel wrote: On 27/01/15 08:35, Jan Beulich wrote: On 27.01.15 at 02:51, mcg...@do-not-panic.com wrote: Even if David told you this would be acceptable, I have to

Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

2015-01-29 Thread Luis R. Rodriguez
On Tue, Jan 27, 2015 at 10:06:44AM +, David Vrabel wrote: On 27/01/15 08:35, Jan Beulich wrote: On 27.01.15 at 02:51, mcg...@do-not-panic.com wrote: Even if David told you this would be acceptable, I have to question an abstract model of fixing issues on only 64-bit kernels - this

Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

2015-01-27 Thread Luis R. Rodriguez
On Tue, Jan 27, 2015 at 10:06:44AM +, David Vrabel wrote: On 27/01/15 08:35, Jan Beulich wrote: On 27.01.15 at 02:51, mcg...@do-not-panic.com wrote: Even if David told you this would be acceptable, I have to question an abstract model of fixing issues on only 64-bit kernels - this

Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

2015-01-27 Thread David Vrabel
On 27/01/15 08:35, Jan Beulich wrote: On 27.01.15 at 02:51, mcg...@do-not-panic.com wrote: Even if David told you this would be acceptable, I have to question an abstract model of fixing issues on only 64-bit kernels - this may be acceptable for distro purposes, but seems hardly the right

Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

2015-01-27 Thread Jan Beulich
On 27.01.15 at 02:51, mcg...@do-not-panic.com wrote: Even if David told you this would be acceptable, I have to question an abstract model of fixing issues on only 64-bit kernels - this may be acceptable for distro purposes, but seems hardly the right approach for upstream. If 32-bit ones are to

Re: [Xen-devel] [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

2015-01-27 Thread Andrew Cooper
On 27/01/15 08:35, Jan Beulich wrote: On 27.01.15 at 02:51, mcg...@do-not-panic.com wrote: Even if David told you this would be acceptable, I have to question an abstract model of fixing issues on only 64-bit kernels - this may be acceptable for distro purposes, but seems hardly the right

[PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

2015-01-26 Thread Luis R. Rodriguez
From: Luis R. Rodriguez mcg...@suse.com Xen has support for splitting heavy work work into a series of hypercalls, called multicalls, and preempting them through what Xen calls continuation [0]. Despite this though without CONFIG_PREEMPT preemption won't happen, without preemption a system can