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[Qemu-devel] [PULL 3/3] xen_platform: SUSE xenlinux unplug for emulated
From: |
Stefano Stabellini |
Subject: |
[Qemu-devel] [PULL 3/3] xen_platform: SUSE xenlinux unplug for emulated PCI |
Date: |
Fri, 21 Oct 2016 13:06:59 -0700 |
From: Olaf Hering <address@hidden>
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 <address@hidden>
Reviewed-by: Stefano Stabellini <address@hidden>
Signed-off-by: Stefano Stabellini <address@hidden>
---
hw/i386/xen/xen_platform.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/hw/i386/xen/xen_platform.c b/hw/i386/xen/xen_platform.c
index 91d8a7a..2e1e543 100644
--- a/hw/i386/xen/xen_platform.c
+++ b/hw/i386/xen/xen_platform.c
@@ -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;
--
1.9.1