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From: Alex Williamson <alex.williamson@redhat.com>
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Date: Sat, 23 Oct 2010 12:42:44 -0600
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Subject: [Qemu-devel] Re: [PATCH 2/2] msix: Pull in config.h for CONFIG_KVM
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org

On Sat, 2010-10-23 at 19:29 +0200, Michael S. Tsirkin wrote:
> On Sat, Oct 23, 2010 at 10:52:43AM -0600, Alex Williamson wrote:
> > On Sat, 2010-10-23 at 18:16 +0200, Michael S. Tsirkin wrote:
> > > On Fri, Oct 22, 2010 at 02:40:39PM -0600, Alex Williamson wrote:
> > > > We need to pull in config.h or else kvm.h doesn't pull in
> > > > linux/config.h, which we need if we ever want KVM_CAP_IRQCHIP
> > > > defined.  This requires moving the object over to Makefile.target
> > > > or else we can't find config-target.h
> > > > 
> > > > Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> > > 
> > > Why? We just moved it from .target to .objs, see
> > > 889e30cc18e21f2091b77267dca8096d7dd34f8b.
> > 
> > Maybe that's why it used to work.  When building in the qemu-kvm.git
> > tree, I'm not getting CONFIG_KVM defined, which means I'm not getting
> > KVM_CAP_IRQCHIP defined, which results in msix_irq_entries not being
> > allocated.  Then when I call msix_vector_use, I get a seg fault.
> > Something is broken there.  Thanks,
> > 
> > Alex
> 
> This is hopefully fixed in the latest bits.
> bd8b215bce453706c3951460cc7e6627ccb90314

Nope, my tree includes that.  It's not kvm_set_irq, it's kvm_msix_add,
which dereferences msix_irq_entries, which is only allocated in
msix_init if KVM_CAP_IRQCHIP is defined, which it's not.  Maybe you also
meant to remove the ifdef from msix_init?  I also note there's another
in msix_notify.  Thanks,

Alex