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xen_platform: SUSE xenlinux unplug for emulated PCI

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Implement SUSE specific unplug protocol for emulated PCI devices
in PVonHVM guests. Its a simple 'outl(1, (ioaddr + 4));'.
This protocol was implemented and used since Xen 3.0.4.
It is used in all SUSE/SLES/openSUSE releases up to SLES11SP3 and
openSUSE 12.3.
In addition old (pre-2011) VMDP versions are handled as well.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Olaf Hering 2016-10-21 14:37:07 +02:00 committed by Stefano Stabellini
parent 78f66897dd
commit 35132016dc
1 changed files with 26 additions and 1 deletions
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27
hw/i386/xen/xen_platform.c
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@ -311,13 +311,38 @@ static void xen_platform_ioport_writeb(void *opaque, hwaddr addr,
uint64_t val, unsigned int size)
{
PCIXenPlatformState *s = opaque;
PCIDevice *pci_dev = PCI_DEVICE(s);
switch (addr) {
case 0: /* Platform flags */
platform_fixed_ioport_writeb(opaque, 0, (uint32_t)val);
break;
case 4:
if (val == 1) {
/*
* SUSE unplug for Xenlinux
* xen-kmp used this since xen-3.0.4, instead the official protocol
* from xen-3.3+ It did an unconditional "outl(1, (ioaddr + 4));"
* Pre VMDP 1.7 used 4 and 8 depending on how VMDP was configured.
* If VMDP was to control both disk and LAN it would use 4.
* If it controlled just disk or just LAN, it would use 8 below.
*/
pci_unplug_disks(pci_dev->bus);
pci_unplug_nics(pci_dev->bus);
}
break;
case 8:
log_writeb(s, (uint32_t)val);
switch (val) {
case 1:
pci_unplug_disks(pci_dev->bus);
break;
case 2:
pci_unplug_nics(pci_dev->bus);
break;
default:
log_writeb(s, (uint32_t)val);
break;
}
break;
default:
break;