From: Avi Kivity <avi@qumranet.com>
To: Anthony Liguori <aliguori@us.ibm.com>
Cc: kvm-devel@lists.sourceforge.net, Zachary Amsden <zach@vmware.com>,
linux-kernel@vger.kernel.org,
Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [kvm-devel] [PATCH 2/3] Refactor hypercall infrastructure (v3)
Date: Tue, 18 Sep 2007 15:10:02 +0200 [thread overview]
Message-ID: <46EFCE2A.1020105@qumranet.com> (raw)
In-Reply-To: <11900590723438-git-send-email-aliguori@us.ibm.com>
Anthony Liguori wrote:
> This patch refactors the current hypercall infrastructure to better support live
> migration and SMP. It eliminates the hypercall page by trapping the UD
> exception that would occur if you used the wrong hypercall instruction for the
> underlying architecture and replacing it with the right one lazily.
>
> It also introduces the infrastructure to probe for hypercall available via
> CPUID leaves 0x40000000. CPUID leaf 0x40000001 should be filled out by
> userspace.
>
> A fall-out of this patch is that the unhandled hypercalls no longer trap to
> userspace. There is very little reason though to use a hypercall to communicate
> with userspace as PIO or MMIO can be used. There is no code in tree that uses
> userspace hypercalls.
>
>
Surprisingly, this patch kills Windows XP (ACPI HAL). I'll try to find
out why.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
Zachary Amsden <zach-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>,
Jeremy Fitzhardinge <jeremy-TSDbQ3PG+2Y@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 2/3] Refactor hypercall infrastructure (v3)
Date: Tue, 18 Sep 2007 15:10:02 +0200 [thread overview]
Message-ID: <46EFCE2A.1020105@qumranet.com> (raw)
In-Reply-To: <11900590723438-git-send-email-aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Anthony Liguori wrote:
> This patch refactors the current hypercall infrastructure to better support live
> migration and SMP. It eliminates the hypercall page by trapping the UD
> exception that would occur if you used the wrong hypercall instruction for the
> underlying architecture and replacing it with the right one lazily.
>
> It also introduces the infrastructure to probe for hypercall available via
> CPUID leaves 0x40000000. CPUID leaf 0x40000001 should be filled out by
> userspace.
>
> A fall-out of this patch is that the unhandled hypercalls no longer trap to
> userspace. There is very little reason though to use a hypercall to communicate
> with userspace as PIO or MMIO can be used. There is no code in tree that uses
> userspace hypercalls.
>
>
Surprisingly, this patch kills Windows XP (ACPI HAL). I'll try to find
out why.
--
error compiling committee.c: too many arguments to function
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next prev parent reply other threads:[~2007-09-18 13:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-17 19:57 [PATCH 1/3] Add vmmcall/vmcall to x86_emulate (v3) Anthony Liguori
2007-09-17 19:57 ` [PATCH 2/3] Refactor hypercall infrastructure (v3) Anthony Liguori
2007-09-17 19:57 ` Anthony Liguori
[not found] ` <11900590723438-git-send-email-aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2007-09-17 19:57 ` [PATCH 3/3] Add the paravirtualization CPUID entry to QEMU (v3) Anthony Liguori
2007-09-17 21:56 ` [kvm-devel] [PATCH 2/3] Refactor hypercall infrastructure (v3) Nakajima, Jun
2007-09-17 21:56 ` Nakajima, Jun
2007-09-18 13:10 ` Avi Kivity [this message]
2007-09-18 13:10 ` Avi Kivity
2007-09-18 13:12 ` [kvm-devel] " Avi Kivity
2007-09-18 13:12 ` Avi Kivity
2007-09-18 13:27 ` [kvm-devel] " Avi Kivity
2007-09-18 13:27 ` Avi Kivity
2007-09-18 13:31 ` [kvm-devel] " Anthony Liguori
[not found] ` <1190059071649-git-send-email-aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2007-09-18 9:18 ` [PATCH 1/3] Add vmmcall/vmcall to x86_emulate (v3) Avi Kivity
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