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Re: [Qemu-devel] [PULL 21/29] xen/pt: Sync up the dev.config and data va
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] [PULL 21/29] xen/pt: Sync up the dev.config and data values. |
Date: |
Tue, 15 Sep 2015 14:28:51 +0100 |
User-agent: |
Alpine 2.02 (DEB 1266 2009-07-14) |
On Tue, 15 Sep 2015, Konrad Rzeszutek Wilk wrote:
> On Tue, Sep 15, 2015 at 11:07:02AM +0100, Stefano Stabellini wrote:
> > CC Konrad
> >
> > On Mon, 14 Sep 2015, Paolo Bonzini wrote:
> > > On 10/09/2015 19:15, Stefano Stabellini wrote:
> > > > +
> > > > + switch (reg->size) {
> > > > + case 1: rc = xen_host_pci_get_byte(&s->real_device, offset,
> > > > (uint8_t *)&val);
> > >
> > > A bit ugly, and it relies on the host being little endian.
> > >
> > > > + break;
> > > > + case 2: rc = xen_host_pci_get_word(&s->real_device, offset,
> > > > (uint16_t *)&val);
> > >
> > > Same here.
> >
> > cpu_to_le32?
> >
> > But in practice, Xen being little endian only, I doubt that
> > xen_pt_config_init.c
> > would actually work on be.
> >
> >
> > > > + break;
> > > > + case 4: rc = xen_host_pci_get_long(&s->real_device, offset,
> > > > &val);
> > > > + break;
> > > > + default: assert(1);
> > >
> > > This should be assert(0) or, better, abort().
>
> OK. Stefano, do you want me to:
>
> 1). Rebase the patches on top of your tag?
Patches are already upstream, so no worries about rebasing.
> 2). Send an follow up patch to change this to abort()? (and wherever else I
> used
> assert(..)?
Yes, that would be good.
> 3). Wait till Paolo is done going through the patchset and then revisit 1)
> or 2)?
I don't know if Paolo has any more comments.
Regarding his previous comment on little-endian, as I wrote I am not
sure if sprinkling around some cpu_to_le32 would actually make
hw/xen/xen_pt_config_init.c much better. I'll leave that to you.
- [Qemu-devel] [PULL 08/29] igd gfx passthrough: create a isa bridge, (continued)
- [Qemu-devel] [PULL 08/29] igd gfx passthrough: create a isa bridge, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 26/29] xen/pt: Make xen_pt_unregister_device idempotent, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 13/29] xen/HVM: atomically access pointers in bufioreq handling, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 12/29] xen-hvm: When using xc_domain_add_to_physmap also include errno when reporting, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 22/29] xen/pt: Check if reg->init function sets the 'data' past the reg->size, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 28/29] xen/pt: Check for return values for xen_host_pci_[get|set] in init, Stefano Stabellini, 2015/09/10
- [Qemu-devel] [PULL 21/29] xen/pt: Sync up the dev.config and data values., Stefano Stabellini, 2015/09/10
[Qemu-devel] [PULL 14/29] xen/pt: Update comments with proper function name., Stefano Stabellini, 2015/09/10
[Qemu-devel] [PULL 25/29] xen/pt: Log xen_host_pci_get/set errors in MSI code., Stefano Stabellini, 2015/09/10
[Qemu-devel] [PULL 24/29] xen/pt: Log xen_host_pci_get in two init functions, Stefano Stabellini, 2015/09/10
[Qemu-devel] [PULL 18/29] xen/pt/msi: Add the register value when printing logging and error messages, Stefano Stabellini, 2015/09/10
[Qemu-devel] [PULL 23/29] xen/pt: Remove XenPTReg->data field., Stefano Stabellini, 2015/09/10
[Qemu-devel] [PULL 11/29] xen, gfx passthrough: add opregion mapping, Stefano Stabellini, 2015/09/10
[Qemu-devel] [PULL 15/29] xen/pt: Make xen_pt_msi_set_enable static, Stefano Stabellini, 2015/09/10
[Qemu-devel] [PULL 16/29] xen/pt: xen_host_pci_config_read returns -errno, not -1 on failure, Stefano Stabellini, 2015/09/10