From: Sheng Yang <sheng@linux.intel.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH 3/3] KVM: Enable MSI-X for KVM assigned device
Date: Thu, 12 Feb 2009 14:03:59 +0800 [thread overview]
Message-ID: <200902121404.00220.sheng@linux.intel.com> (raw)
In-Reply-To: <4992C937.2090708@redhat.com>
On Wednesday 11 February 2009 20:48:55 Avi Kivity wrote:
> Sheng Yang wrote:
> > This patch finally enable MSI-X.
> >
> > What we need for MSI-X:
> > 1. Intercept one page in MMIO region of device. So that we can get guest
> > desired MSI-X table and set up the real one. Now this have been done by
> > guest, and transfer to kernel using ioctl KVM_SET_MSIX_NR and
> > KVM_SET_MSIX_ENTRY.
>
> Looking at the patch, you're doing that in userspace. Good.
>
> > 2. The PCI spec allowed to change MSI-X table dynamically. That means,
> > the OS can enable MSI-X, then mask one MSI-X entry, modify it, and unmask
> > it. The patch didn't support this, and Linux also don't work in this way.
>
> What about Windows?
Not sure. Don't have Windows driver to test... And only Vista and later
support MSI/MSI-X, not sure it would be so aggressive... We can add some debug
if such condition happened.
--
regards
Yang, Sheng
next prev parent reply other threads:[~2009-02-12 6:04 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-11 8:08 [PATCH 0/3 v2] MSI-X enabling Sheng Yang
2009-02-11 8:08 ` [PATCH 1/3] KVM: Ioctls for init MSI-X entry Sheng Yang
2009-02-11 12:44 ` Avi Kivity
2009-02-12 6:28 ` Sheng Yang
2009-02-12 10:07 ` Sheng Yang
2009-02-12 18:46 ` Marcelo Tosatti
2009-02-16 3:18 ` Sheng Yang
2009-02-16 5:49 ` Sheng Yang
2009-02-16 23:23 ` Marcelo Tosatti
2009-02-17 1:35 ` Sheng Yang
2009-02-17 1:36 ` Sheng Yang
2009-02-11 8:08 ` [PATCH 2/3] KVM: Add gsi_msg_pending_bitmap for MSI-X Sheng Yang
2009-02-12 19:51 ` Marcelo Tosatti
2009-02-13 3:37 ` Sheng Yang
2009-02-13 17:10 ` Marcelo Tosatti
2009-02-17 18:09 ` Avi Kivity
2009-02-18 1:33 ` Sheng Yang
2009-02-11 8:08 ` [PATCH 3/3] KVM: Enable MSI-X for KVM assigned device Sheng Yang
2009-02-11 12:48 ` Avi Kivity
2009-02-12 6:03 ` Sheng Yang [this message]
2009-02-12 20:40 ` Marcelo Tosatti
2009-02-13 5:29 ` Sheng Yang
2009-02-13 17:13 ` Marcelo Tosatti
2009-02-18 9:44 [PATCH 0/3 v3] MSI-X enabling Sheng Yang
2009-02-18 9:44 ` [PATCH 3/3] KVM: Enable MSI-X for KVM assigned device Sheng Yang
2009-02-18 10:45 ` Avi Kivity
2009-02-18 12:24 ` Sheng Yang
2009-02-18 12:36 ` Avi Kivity
2009-02-18 12:52 ` Sheng Yang
2009-02-25 9:22 [PATCH 0/3 v4][Resend] MSI-X enabling Sheng Yang
2009-02-25 9:22 ` [PATCH 3/3] KVM: Enable MSI-X for KVM assigned device Sheng Yang
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