[Xen-changelog] [xen stable-4.9] x86/vpmu: Remove unnecessary call to do_interrupt()

[patchbot@xxxxxxx]

commit 533b9e4fbaa9e98d978cf8322721dcd222caaef2
Author:     Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
AuthorDate: Thu Nov 16 11:44:14 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Nov 16 11:44:14 2017 +0100

    x86/vpmu: Remove unnecessary call to do_interrupt()
    
    This call was left during PVHv1 removal (commit 33e5c32559e1 ("x86:
    remove PVHv1 code")):
    
    -        if ( is_pvh_vcpu(sampling) &&
    -             !(vpmu_mode & XENPMU_MODE_ALL) &&
    +        if ( !(vpmu_mode & XENPMU_MODE_ALL) &&
                  !vpmu->arch_vpmu_ops->do_interrupt(regs) )
                 return;
    
    As result of this extra call VPMU no longer works for PV guests on Intel
    because we effectively lose value of MSR_CORE_PERF_GLOBAL_STATUS.
    
    Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 5e2bfc23f7c9a60c01a02c619e1f3d7456ce0e93
    master date: 2017-10-27 14:32:38 +0100
---
 xen/arch/x86/cpu/vpmu.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/xen/arch/x86/cpu/vpmu.c b/xen/arch/x86/cpu/vpmu.c
index 1f7830b..40da7e3 100644
--- a/xen/arch/x86/cpu/vpmu.c
+++ b/xen/arch/x86/cpu/vpmu.c
@@ -226,10 +226,6 @@ void vpmu_do_interrupt(struct cpu_user_regs *regs)
         if ( !vpmu->xenpmu_data )
             return;
 
-        if ( !(vpmu_mode & XENPMU_MODE_ALL) &&
-             !vpmu->arch_vpmu_ops->do_interrupt(regs) )
-            return;
-
         if ( vpmu_is_set(vpmu, VPMU_CACHED) )
             return;
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.9

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