xen_platform: SUSE xenlinux unplug for emulated PCI
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>
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@ -311,13 +311,38 @@ static void xen_platform_ioport_writeb(void *opaque, hwaddr addr,
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uint64_t val, unsigned int size)
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{
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PCIXenPlatformState *s = opaque;
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PCIDevice *pci_dev = PCI_DEVICE(s);
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switch (addr) {
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case 0: /* Platform flags */
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platform_fixed_ioport_writeb(opaque, 0, (uint32_t)val);
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break;
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case 4:
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if (val == 1) {
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/*
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* SUSE unplug for Xenlinux
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* xen-kmp used this since xen-3.0.4, instead the official protocol
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* from xen-3.3+ It did an unconditional "outl(1, (ioaddr + 4));"
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* Pre VMDP 1.7 used 4 and 8 depending on how VMDP was configured.
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* If VMDP was to control both disk and LAN it would use 4.
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* If it controlled just disk or just LAN, it would use 8 below.
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*/
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pci_unplug_disks(pci_dev->bus);
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pci_unplug_nics(pci_dev->bus);
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}
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break;
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case 8:
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log_writeb(s, (uint32_t)val);
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switch (val) {
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case 1:
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pci_unplug_disks(pci_dev->bus);
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break;
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case 2:
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pci_unplug_nics(pci_dev->bus);
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break;
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default:
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log_writeb(s, (uint32_t)val);
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break;
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}
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break;
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default:
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break;
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