[Xen-changelog] [qemu-xen-4.2-testing] xen/pt: correctly handle PM status bit

[patchbot@xxxxxxx]

commit 5c6e4c043793bee997cd396de544bc9bcf5e74d2
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jun 10 14:17:55 2015 +0100
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Wed Jun 10 14:17:55 2015 +0100

    xen/pt: correctly handle PM status bit
    
    xen_pt_pmcsr_reg_write() needs an adjustment to deal with the RW1C
    nature of the not passed through bit 15 (PCI_PM_CTRL_PME_STATUS).
    
    This is a preparatory patch for XSA-131.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 hw/pass-through.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/hw/pass-through.c b/hw/pass-through.c
index 98a7df6..34aa154 100644
--- a/hw/pass-through.c
+++ b/hw/pass-through.c
@@ -3784,7 +3784,8 @@ static int pt_pmcsr_reg_write(struct pt_dev *ptdev,
 
     /* create value for writing to I/O device register */
     throughable_mask = ~reg->emu_mask & valid_mask;
-    *value = PT_MERGE_VALUE(*value, dev_value, throughable_mask);
+    *value = PT_MERGE_VALUE(*value, dev_value & ~PCI_PM_CTRL_PME_STATUS,
+                            throughable_mask);
 
     if (!ptdev->power_mgmt)
         return 0;
--
generated by git-patchbot for /home/xen/git/qemu-xen-4.2-testing.git

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