Commit 35132016 authored by Olaf Hering's avatar Olaf Hering Committed by Stefano Stabellini
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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: default avatarOlaf Hering <olaf@aepfle.de>
Reviewed-by: default avatarStefano Stabellini <sstabellini@kernel.org>
Signed-off-by: default avatarStefano Stabellini <sstabellini@kernel.org>
parent 78f66897

hw/i386/xen/xen_platform.c

+26 −1
Original line number Diff line number Diff line
@@ -311,14 +311,39 @@ 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:

        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;

    }