Re: [Xen-devel] any plans to sopport virtio-serial ?

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 25 Nov 2010, Vasiliy G Tolstov wrote:
> On Wed, 2010-11-24 at 19:54 +0300, Vasiliy G Tolstov wrote:
> > On Wed, 2010-11-24 at 12:55 +0000, Stefano Stabellini wrote:
> > > On Tue, 23 Nov 2010, Vasiliy G Tolstov wrote:
> > > > Stefano, is there this branch tested for live migration issues? For
> > > > example, if i compile kernel with config, that working on
> > > > stable-2.6.32.x does it work on pvhvm branch?
> > >  
> > > PV on HVM should work on stable-2.6.32.x but I received a bug
> > > report on live migration issues precisely on that kernel, so if it
> > > doesn't work for you I wouldn't be surprised.
> > > 
> > > Alternatively I suggest you keep using 2.6.36-rc6-pvhvm-v8.
> > > 
> 
> Stefano, i'm complete investigate, that last two commits, breaks domain
> creating (use 2.6.36-rc6-pvhvm-v8). If i roll back this patches, xm
> create construct domains and boot. If apply, domain after creating
> destroyed.
> 

I think I found and fixed the issue, try to clone again
2.6.37-rc4-pvhvm-pvconsole and this time the guest should boot.
However I believe that pv consoles for hvm guests won't still work
properly with xend.
If you want to try two pv consoles with both pv and hvm guests apply
the appended patch to xen-unstable and use xl to start a guest:

---

diff -r 8420b82c22c2 tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c  Tue Nov 30 11:34:08 2010 +0000
+++ b/tools/libxl/xl_cmdimpl.c  Tue Dec 14 17:25:34 2010 +0000
@@ -1666,6 +1666,12 @@ start:
 
         init_console_info(&console, 0, &state);
         console.domid = domid;
+        console.consback = LIBXL_CONSBACK_IOEMU;
+        libxl_device_console_add(&ctx, domid, &console);
+        libxl_device_console_destroy(&console);
+        init_console_info(&console, 1, NULL);
+        console.domid = domid;
+        console.consback = LIBXL_CONSBACK_IOEMU;
         libxl_device_console_add(&ctx, domid, &console);
         libxl_device_console_destroy(&console);
 
@@ -1686,13 +1692,17 @@ start:
 
         init_console_info(&console, 0, &state);
         console.domid = domid;
-        if (d_config.num_vfbs)
-             console.consback = LIBXL_CONSBACK_IOEMU;
+        console.consback = LIBXL_CONSBACK_IOEMU;
         libxl_device_console_add(&ctx, domid, &console);
         libxl_device_console_destroy(&console);
 
-        if (d_config.num_vfbs)
-            libxl_create_xenpv_qemu(&ctx, domid, d_config.vfbs, &dm_starting);
+        init_console_info(&console, 1, NULL);
+        console.domid = domid;
+        console.consback = LIBXL_CONSBACK_IOEMU;
+        libxl_device_console_add(&ctx, domid, &console);
+        libxl_device_console_destroy(&console);
+
+        libxl_create_xenpv_qemu(&ctx, domid, d_config.vfbs, &dm_starting);
     }
 
     if (dm_starting)

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