[Xen-changelog] [xen stable-4.2] fix XSA-46 regression with xend/xm

[patchbot@xxxxxxx]

commit c298f7ec04fb474abdffa360e352be275a024467
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu May 23 10:13:18 2013 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu May 23 10:13:18 2013 +0200

    fix XSA-46 regression with xend/xm
    
    The hypervisor side changes for XSA-46 require the tool stack to now
    always map the guest pIRQ before granting access permission to the
    underlying host IRQ (GSI). This in particular requires that pciif.py
    no longer can skip this step (assuming qemu would do it) for HVM
    guests.
    
    This in turn exposes, however, an inconsistency between xend and qemu:
    The former wants to always establish 1:1 mappings between pIRQ and host
    IRQ (for non-MSI only of course), while the latter always wants to
    allocate an arbitrary mapping. Since the whole tool stack obviously
    should always agree on the mapping model, make libxc enforce the 1:1
    mapping as the more natural one (as well as being the one that allows
    for easier debugging, since there no need to find out the extra
    mapping). Users of libxc that want to establish a particular (rather
    than an allocated) mapping are still free to do so, as well as tool
    stacks not based on libxc wanting to implement an allocation based
    model (which is why it's not the hypervisor that's being changed to
    enforce either model).
    
    Since libxl, like xend, already uses a 1:1 model, it's unaffected by
    the libxc change (and it being unaffected by the original hypervisor
    side changes is - afaict - simply due to qemu getting spawned at a
    later point in time compared to the xend event flow).
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Tested-by: Andreas Falck <falck.andreas.lists@xxxxxxxxx> (on 4.1)
    Tested-by: Gordan Bobic <gordan@xxxxxxxxxx> (on 4.2)
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 934a5253d932b6f67fe40fc48975a2b0117e4cce
    master date: 2013-05-21 11:32:34 +0200
---
 tools/libxc/xc_physdev.c              |    2 +-
 tools/python/xen/xend/server/pciif.py |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/libxc/xc_physdev.c b/tools/libxc/xc_physdev.c
index bdbcba7..cf02d85 100644
--- a/tools/libxc/xc_physdev.c
+++ b/tools/libxc/xc_physdev.c
@@ -49,7 +49,7 @@ int xc_physdev_map_pirq(xc_interface *xch,
     map.domid = domid;
     map.type = MAP_PIRQ_TYPE_GSI;
     map.index = index;
-    map.pirq = *pirq;
+    map.pirq = *pirq < 0 ? index : *pirq;
 
     rc = do_physdev_op(xch, PHYSDEVOP_map_pirq, &map, sizeof(map));
 
diff --git a/tools/python/xen/xend/server/pciif.py 
b/tools/python/xen/xend/server/pciif.py
index 43d0c80..27c1b75 100644
--- a/tools/python/xen/xend/server/pciif.py
+++ b/tools/python/xen/xend/server/pciif.py
@@ -340,7 +340,7 @@ class PciController(DevController):
                 raise VmError(('pci: failed to configure I/O memory on device 
'+
                             '%s - errno=%d')%(dev.name,rc))
 
-        if not self.vm.info.is_hvm() and dev.irq:
+        if dev.irq > 0:
             rc = xc.physdev_map_pirq(domid = fe_domid,
                                    index = dev.irq,
                                    pirq  = dev.irq)
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.2

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