[PATCH qemu-xen-traditional 2/2] xen_platform: SUSE xenlinux unplug for emulated PCI

[Olaf Hering <olaf@aepfle.de>]

From: Olaf Hering <ohering@suse.de>

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.

Upstream commit 35132016dc1c27de2b1354b161df6cc22f3ac5bf

Signed-off-by: Olaf Hering <ohering@suse.de>
---
 hw/xen_platform.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/hw/xen_platform.c b/hw/xen_platform.c
index 0a94e0d..3c2fc0e 100644
--- a/hw/xen_platform.c
+++ b/hw/xen_platform.c
@@ -337,9 +337,42 @@ static void xen_platform_ioport_writeb(void *opaque, uint32_t addr, uint32_t val
     }
 }
 
+static void suse_platform_ioport_writel(void *opaque, uint32_t addr, uint32_t val)
+{
+    addr &= 0x0f;
+    switch (addr) {
+    case 4:
+        /*
+         * 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.
+         * */
+        ide_unplug_harddisks();
+        pci_unplug_scsi();
+        pci_unplug_netifs();
+        net_tap_shutdown_all();
+        break;
+    case 8:
+        if (val ==1 ) {
+            ide_unplug_harddisks();
+            pci_unplug_scsi();
+        } else if (val == 2) {
+            pci_unplug_netifs();
+            net_tap_shutdown_all();
+        }
+        break;
+    default:
+        break;
+    }
+}
+
 static void platform_ioport_map(PCIDevice *pci_dev, int region_num, uint32_t addr, uint32_t size, int type)
 {
     PCIXenPlatformState *d = (PCIXenPlatformState *)pci_dev;
+    register_ioport_write(addr, 16, 4, suse_platform_ioport_writel, d);
     register_ioport_write(addr, size, 1, xen_platform_ioport_writeb, d);
     register_ioport_read(addr, size, 1, xen_platform_ioport_readb, d);
 }

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