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Message-ID: <4AEEF878.2090805@redhat.com> Date: Mon, 02 Nov 2009 17:19:20 +0200 From: Avi Kivity <avi@...hat.com> To: Gleb Natapov <gleb@...hat.com> CC: kvm@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 08/11] Add "wait for page" hypercall. On 11/02/2009 05:13 PM, Gleb Natapov wrote: > On Mon, Nov 02, 2009 at 03:05:11PM +0200, Avi Kivity wrote: > >> On 11/01/2009 01:56 PM, Gleb Natapov wrote: >> >>> We want to be able to inject async pagefault into guest event if a guest >>> is not executing userspace code. But in this case guest may receive >>> async page fault in non-sleepable context. In this case it will be >>> able to make "wait for page" hypercall vcpu will be put to sleep until >>> page is swapped in and guest can continue without reschedule. >>> >> What's wrong with just 'hlt' and checking in the guest? >> >> > Halting here will leave vcpu with interrupt disabled and this will prevent > "wake up" signal delivery. Page faults can be delivered with interrupts disabled. > Enabling interrupts is also not an options > since we can't be sure that vcpu can process interrupt at this point. > That's too bad, allowing interrupts in this context can help maintain responsiveness. -- 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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