Re: [Xen-devel] Regressions in v3.3-rc1 introduced by "xen/granttable: Grant tables V2 implementation"

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jan 24, 2012 at 11:49:49PM -0500, Konrad Rzeszutek Wilk wrote:
> When I try to bootup a PVonHVM guest with Xen 4.1 I get this:

.. snip..
> 
> and with this little patch I can get it to work:

I get the domU to boot but the network stops being responsive.
I see this in the Dom0:


(XEN) grant_table.c:362:d0 Bad flags (0) or dom (0). (expected dom 0, flags 103)
[ 6834.488816] vif vif-12-0: 1 mapping in shared page 768 from domain 12
[ 6834.490235] vif vif-12-0: 1 mapping shared-frames 768/769 port 15

Replacing the patch with:

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 1cd94da..b4d4eac 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -948,9 +948,12 @@ static void gnttab_request_version(void)
        int rc;
        struct gnttab_set_version gsv;
 
-       gsv.version = 2;
+       if (xen_hvm_domain())
+               gsv.version = 1;
+       else
+               gsv.version = 2;
        rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1);
-       if (rc == 0) {
+       if (rc == 0 && gsv.version == 2) {
                grant_table_version = 2;
                gnttab_interface = &gnttab_v2_ops;
        } else if (grant_table_version == 2) {

Gets me back to how it worked in Linux v3.2.

But that is just a band-aid fix...

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