linux-kernel - Re: [PATCH 4/4][RFC] kvm: eoi

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 24 Jun 2012 09:02:36 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	jan.kiszka@...mens.com, mst@...hat.com
Subject: Re: [PATCH 4/4][RFC] kvm: eoi_eventfd

On Sun, 2012-06-24 at 15:56 +0300, Avi Kivity wrote:
> On 06/23/2012 01:16 AM, Alex Williamson wrote:
> > I think we're probably also going to need something like this.
> > When running in non-accelerated qemu, we're going to have to
> > create some kind of EOI notifier for drivers.  VFIO can make
> > additional improvements when running on KVM so it will probably
> > make use of the KVM_IRQFD_LEVEL_EOI interface, but we don't
> > want to have a generic EOI notifier in qemu that just stops
> > working when kvm-ioapic is enabled.
> 
> Why?

Hmm, I must be missing something or not describing it correctly, because
it seems obvious.  If we create a dependency in qemu of needing to know
when an eoi occurs and notifier a driver and have no way to fulfill that
dependency when running on kvm... that'd be bad, right?  I don't want to
assume that every consumer of such an interface would prefer to make use
of an irqfd.  Not sure if that answers your question though.  Thanks,

Alex

--
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/