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Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag |
Date: |
Thu, 10 Sep 2015 12:26:21 +0100 |
User-agent: |
Alpine 2.02 (DEB 1266 2009-07-14) |
On Thu, 10 Sep 2015, Michael S. Tsirkin wrote:
> On Thu, Sep 10, 2015 at 11:29:18AM +0100, Stefano Stabellini wrote:
> > CC Michael
> >
> > On Thu, 10 Sep 2015, Stefano Stabellini wrote:
> > > On Thu, 10 Sep 2015, Chen, Tiejun wrote:
> > > > > xen-host-pci-device.c is only compiled if CONFIG_XEN_PCI_PASSTHROUGH
> > > > > was set by configure. That won't be the case on OSX or Windows, where
> > > > > the Xen headers don't exist.
> > > > >
> > > >
> > > > Okay. This actually shouldn't be enabled on Windows so what about this?
> > >
> > > I think it would be nicer to replace the pread than introducing ifdefs.
> >
> > Something like:
> >
> > ---
> > Replace pread with read to avoid build breakages on Windows
> >
> > Signed-off-by: Stefano Stabellini <address@hidden>
>
> I'd prefer a wrapper that does the right thing.
> No sense in doubling the # of system calls for everyone.
If this was done on an hot path I would agree with you, but it is just
one call at initialization time (igd_pt_i440fx_initfn).
> > diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> > index 58a33fb..9a40429 100644
> > --- a/hw/pci-host/piix.c
> > +++ b/hw/pci-host/piix.c
> > @@ -774,8 +774,11 @@ static int host_pci_config_read(int pos, int len,
> > uint32_t val)
> > return -ENODEV;
> > }
> >
> > + if (lseek(config_fd, pos, SEEK_SET) != pos) {
> > + return -errno;
> > + }
> > do {
> > - rc = pread(config_fd, (uint8_t *)&val, len, pos);
> > + rc = read(config_fd, (uint8_t *)&val, len);
> > } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
> > if (rc != len) {
> > return -errno;
>
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, (continued)
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Peter Maydell, 2015/09/08
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Stefano Stabellini, 2015/09/09
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Stefano Stabellini, 2015/09/09
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Peter Maydell, 2015/09/09
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Chen, Tiejun, 2015/09/09
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Peter Maydell, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Chen, Tiejun, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Stefano Stabellini, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Stefano Stabellini, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Michael S. Tsirkin, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag,
Stefano Stabellini <=
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Michael S. Tsirkin, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Stefano Stabellini, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Michael S. Tsirkin, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Chen, Tiejun, 2015/09/10
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Paolo Bonzini, 2015/09/14
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Stefano Stabellini, 2015/09/15
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Paolo Bonzini, 2015/09/15
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Chen, Tiejun, 2015/09/15
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Stefano Stabellini, 2015/09/17
- Re: [Qemu-devel] [PULL 0/19] xen-2015-09-08-tag, Peter Maydell, 2015/09/09