Re: [Xen-devel] [PATCH] libxl: passthrough: avoid passing through devices not owned by pciback

["Hao, Xudong" <xudong.hao@xxxxxxxxx>]

<RESEND: Porting from xen 4.1, patch on Xen unstable 25220>

libxl: passthrough: avoid passing through devices not owned by pciback

This patch makes sure the passthrough device belongs to pciback before allow 
them passthrough to the guest.  There are still many other checks missing.

xm terminates the guest startup process when this type of condition is found.  
This patch just allows the guest to continue to boot but with no device 
passthrough.

Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
Signed-off-by: Xudong Hao <xudong.hao@xxxxxxxxx>

diff -r a06e6cdeafe3 tools/libxl/libxl_pci.c
--- a/tools/libxl/libxl_pci.c   Mon Apr 16 13:05:28 2012 +0200
+++ b/tools/libxl/libxl_pci.c   Wed Apr 17 17:02:25 2013 +0800
@@ -664,6 +664,24 @@ int libxl_device_pci_add(libxl_ctx *ctx,
     return rc;
 }
 
+static int libxl_pcidev_assignable(libxl_ctx *ctx, libxl_device_pci *pcidev)
+{
+    libxl_device_pci *pcidevs;
+    int num, i;
+
+    pcidevs = libxl_device_pci_list_assignable(ctx, &num);
+    for (i = 0; i < num; i++) {
+        if (pcidevs[i].domain == pcidev->domain &&
+            pcidevs[i].bus == pcidev->bus &&
+            pcidevs[i].dev == pcidev->dev &&
+            pcidevs[i].func == pcidev->func)
+        {
+            return 1;
+        }
+    }
+    return 0;
+}
+
 int libxl__device_pci_add(libxl__gc *gc, uint32_t domid, libxl_device_pci 
*pcidev, int starting)
 {
     libxl_ctx *ctx = libxl__gc_owner(gc);
@@ -674,6 +692,13 @@ int libxl__device_pci_add(libxl__gc *gc,
 
     rc = libxl__device_pci_setdefault(gc, pcidev);
     if (rc) goto out;
+
+    if (!libxl_pcidev_assignable(ctx, pcidev)) {
+        LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "PCI device %x:%x:%x.%x is not 
assignable",
+                   pcidev->domain, pcidev->bus, pcidev->dev, pcidev->func);
+        rc = ERROR_FAIL;
+        goto out;
+    }
 
     rc = get_all_assigned_devices(gc, &assigned, &num_assigned);
     if ( rc ) {


Thanks,
-Xudong


> -----Original Message-----
> From: Ian Jackson [mailto:Ian.Jackson@xxxxxxxxxxxxx]
> Sent: Wednesday, April 25, 2012 2:03 AM
> To: Hao, Xudong
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; Kay, Allen M
> Subject: Re: [Xen-devel] [PATCH] libxl: passthrough: avoid passing through
> devices not owned by pciback
> 
> Hao, Xudong writes ("Re: [Xen-devel] [PATCH] libxl: passthrough: avoid passing
> through devices not owned by pciback"):
> > <Porting from xen 4.1, patch on Xen unstable 25138>
> 
> I'm afraid that 25138 was out of date even when you posted your
> revised patch, and it still doesn't apply.
> 
> Are you working with the staging tree ?
> 
> Ian.

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