[Xen-changelog] [xen master] intel/VPMU: MSR_CORE_PERF_GLOBAL_CTRL should be initialized to zero

[patchbot@xxxxxxx]

commit 49de0b57b853064d6b3ad1646fafe08b8dcaac98
Author:     Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
AuthorDate: Fri Jan 23 17:54:23 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Jan 23 17:54:23 2015 +0100

    intel/VPMU: MSR_CORE_PERF_GLOBAL_CTRL should be initialized to zero
    
    MSR_CORE_PERF_GLOBAL_CTRL register should be set zero initially. It is up to
    the guest to set it so that counters are enabled.
    
    Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Reviewed-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
    Tested-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vpmu_core2.c |   11 +----------
 1 files changed, 1 insertions(+), 10 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vpmu_core2.c 
b/xen/arch/x86/hvm/vmx/vpmu_core2.c
index 8b84079..7793145 100644
--- a/xen/arch/x86/hvm/vmx/vpmu_core2.c
+++ b/xen/arch/x86/hvm/vmx/vpmu_core2.c
@@ -165,14 +165,6 @@ static int core2_get_fixed_pmc_count(void)
     return MASK_EXTR(eax, PMU_FIXED_NR_MASK);
 }
 
-static u64 core2_calc_intial_glb_ctrl_msr(void)
-{
-    int arch_pmc_bits = (1 << arch_pmc_cnt) - 1;
-    u64 fix_pmc_bits  = (1 << fixed_pmc_cnt) - 1;
-
-    return (fix_pmc_bits << 32) | arch_pmc_bits;
-}
-
 /* edx bits 5-12: Bit width of fixed-function performance counters  */
 static int core2_get_bitwidth_fix_count(void)
 {
@@ -373,8 +365,7 @@ static int core2_vpmu_alloc_resource(struct vcpu *v)
 
     if ( vmx_add_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL) )
         goto out_err;
-    vmx_write_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL,
-                 core2_calc_intial_glb_ctrl_msr());
+    vmx_write_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL, 0);
 
     core2_vpmu_cxt = xzalloc_bytes(sizeof(struct core2_vpmu_context) +
                     (arch_pmc_cnt-1)*sizeof(struct arch_msr_pair));
--
generated by git-patchbot for /home/xen/git/xen.git#master

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