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virtio/vhost: cross endian support

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I have just queued some more bugfix patches today but none fix regressions and
 none are related to these ones, so it looks like a good time for a merge for
 -rc1.
 
 Signed-off-by: Michael S. Tsirkin <[email protected]>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio/vhost cross endian support from Michael Tsirkin:
 "I have just queued some more bugfix patches today but none fix
  regressions and none are related to these ones, so it looks like a
  good time for a merge for -rc1.

  The motivation for this is support for legacy BE guests on the new LE
  hosts.  There are two redeeming properties that made me merge this:

   - It's a trivial amount of code: since we wrap host/guest accesses
     anyway, almost all of it is well hidden from drivers.

   - Sane platforms would never set flags like VHOST_CROSS_ENDIAN_LEGACY,
     and when it's clear, there's zero overhead (as some point it was
     tested by compiling with and without the patches, got the same
     stripped binary).

  Maybe we could create a Kconfig symbol to enforce the second point:
  prevent people from enabling it eg on x86.  I will look into this"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio-pci: alloc only resources actually used.
  macvtap/tun: cross-endian support for little-endian hosts
  vhost: cross-endian support for legacy devices
  virtio: add explicit big-endian support to memory accessors
  vhost: introduce vhost_is_little_endian() helper
  vringh: introduce vringh_is_little_endian() helper
  macvtap: introduce macvtap_is_little_endian() helper
  tun: add tun_is_little_endian() helper
  virtio: introduce virtio_is_little_endian() helper
This commit is contained in:
Linus Torvalds 2015-07-03 16:02:25 -07:00
commit 5fc835284d
15 changed files with 350 additions and 47 deletions
Download patch file Download diff file Expand all files Collapse all files

7
drivers/virtio/virtio_pci_common.c
View file

@ -507,10 +507,6 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
if (rc)
goto err_enable_device;
rc = pci_request_regions(pci_dev, "virtio-pci");
if (rc)
goto err_request_regions;
if (force_legacy) {
rc = virtio_pci_legacy_probe(vp_dev);
/* Also try modern mode if we can't map BAR0 (no IO space). */
@ -540,8 +536,6 @@ err_register:
else
virtio_pci_modern_remove(vp_dev);
err_probe:
pci_release_regions(pci_dev);
err_request_regions:
pci_disable_device(pci_dev);
err_enable_device:
kfree(vp_dev);
@ -559,7 +553,6 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
else
virtio_pci_modern_remove(vp_dev);
pci_release_regions(pci_dev);
pci_disable_device(pci_dev);
}

2
drivers/virtio/virtio_pci_common.h
View file

@ -75,6 +75,8 @@ struct virtio_pci_device {
/* Multiply queue_notify_off by this value. (non-legacy mode). */
u32 notify_offset_multiplier;
int modern_bars;
/* Legacy only field */
/* the IO mapping for the PCI config space */
void __iomem *ioaddr;

13
drivers/virtio/virtio_pci_legacy.c
View file

@ -215,6 +215,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev)
{
struct pci_dev *pci_dev = vp_dev->pci_dev;
int rc;
/* We only own devices >= 0x1000 and <= 0x103f: leave the rest. */
if (pci_dev->device < 0x1000 || pci_dev->device > 0x103f)
@ -226,9 +227,14 @@ int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev)
return -ENODEV;
}
rc = pci_request_region(pci_dev, 0, "virtio-pci-legacy");
if (rc)
return rc;
rc = -ENOMEM;
vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
if (!vp_dev->ioaddr)
return -ENOMEM;
goto err_iomap;
vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;
@ -246,6 +252,10 @@ int virtio_pci_legacy_probe(struct virtio_pci_device *vp_dev)
vp_dev->del_vq = del_vq;
return 0;
err_iomap:
pci_release_region(pci_dev, 0);
return rc;
}
void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
@ -253,4 +263,5 @@ void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
struct pci_dev *pci_dev = vp_dev->pci_dev;
pci_iounmap(pci_dev, vp_dev->ioaddr);
pci_release_region(pci_dev, 0);
}

24
drivers/virtio/virtio_pci_modern.c
View file

@ -499,7 +499,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
* Returns offset of the capability, or 0.
*/
static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
u32 ioresource_types)
u32 ioresource_types, int *bars)
{
int pos;
@ -520,8 +520,10 @@ static inline int virtio_pci_find_capability(struct pci_dev *dev, u8 cfg_type,
if (type == cfg_type) {
if (pci_resource_len(dev, bar) &&
pci_resource_flags(dev, bar) & ioresource_types)
pci_resource_flags(dev, bar) & ioresource_types) {
*bars |= (1 << bar);
return pos;
}
}
}
return 0;
@ -617,7 +619,8 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
/* check for a common config: if not, use legacy mode (bar 0). */
common = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_COMMON_CFG,
IORESOURCE_IO | IORESOURCE_MEM);
IORESOURCE_IO | IORESOURCE_MEM,
&vp_dev->modern_bars);
if (!common) {
dev_info(&pci_dev->dev,
"virtio_pci: leaving for legacy driver\n");
@ -626,9 +629,11 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
/* If common is there, these should be too... */
isr = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_ISR_CFG,
IORESOURCE_IO | IORESOURCE_MEM);
IORESOURCE_IO | IORESOURCE_MEM,
&vp_dev->modern_bars);
notify = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_NOTIFY_CFG,
IORESOURCE_IO | IORESOURCE_MEM);
IORESOURCE_IO | IORESOURCE_MEM,
&vp_dev->modern_bars);
if (!isr || !notify) {
dev_err(&pci_dev->dev,
"virtio_pci: missing capabilities %i/%i/%i\n",
@ -640,7 +645,13 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
* device-specific configuration.
*/
device = virtio_pci_find_capability(pci_dev, VIRTIO_PCI_CAP_DEVICE_CFG,
IORESOURCE_IO | IORESOURCE_MEM);
IORESOURCE_IO | IORESOURCE_MEM,
&vp_dev->modern_bars);
err = pci_request_selected_regions(pci_dev, vp_dev->modern_bars,
"virtio-pci-modern");
if (err)
return err;
err = -EINVAL;
vp_dev->common = map_capability(pci_dev, common,
@ -727,4 +738,5 @@ void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev)
pci_iounmap(pci_dev, vp_dev->notify_base);
pci_iounmap(pci_dev, vp_dev->isr);
pci_iounmap(pci_dev, vp_dev->common);
pci_release_selected_regions(pci_dev, vp_dev->modern_bars);
}