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Message-ID: <46EFCE2A.1020105@qumranet.com> Date: Tue, 18 Sep 2007 15:10:02 +0200 From: Avi Kivity <avi@...ranet.com> To: Anthony Liguori <aliguori@...ibm.com> CC: kvm-devel@...ts.sourceforge.net, Zachary Amsden <zach@...are.com>, linux-kernel@...r.kernel.org, Jeremy Fitzhardinge <jeremy@...p.org> Subject: Re: [kvm-devel] [PATCH 2/3] Refactor hypercall infrastructure (v3) 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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