Messages in this thread | | | Subject | RE: [Xen-devel] Regressions in v3.3-rc1 introduced by "xen/granttable: Grant tables V2 implementation" | From | Ian Campbell <> | Date | Wed, 25 Jan 2012 15:51:46 +0000 |
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On Wed, 2012-01-25 at 15:47 +0000, Ian Campbell wrote: > On Wed, 2012-01-25 at 15:16 +0000, Paul Durrant wrote: > > > -----Original Message----- > > > > > > On HVM for gnttab_shared we make an add_to_physmap call with > > > XENMAPSPACE_grant_table (in gnttab_map). I don't see any support call to > > > do something similar for the status array though and I don't see a > > > XENMAPSPACE_* specifically for that case either in the hypervisor either. > > > > > > > There is no map-space for the status pages. To map them you use the > > standard map space but OR a bit (top bit IIRC) into in the idx. It's a > > bit icky, but that's how it is. > > I can't see that happening anywhere in the current Linux tree, there's > only one call to XENMAPSPACE_grant_table and it doesn't set the top bit, > so presumably this is at least part of the problem. > > I hope that "top bit" is consistent for 32 and 64 bit domains....
#define XENMAPIDX_grant_table_status 0x80000000
...so yes
Ian.
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