[lkml]   [2018]   [Jan]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subject[PATCH v4 0/3] Support Perf Extensions on AMD KVM guests
This patchset adds support for Perf Extension on AMD KVM guests.

When perf runs on a guest with family = 15h || 17h, the MSRs that are
accessed, when the Perf Extension flag is made available, differ from
the existing K7 MSRs. The accesses are to the AMD Core Performance
Extension counters which provide 2 extra counters and new MSRs for both
the event select and counter registers.

Since the new event select and counter MSRs are interleaved and K7 MSRs
are contiguous, the logic to map them to the gp_counters[] is changed.

This patchset has been tested with Family 17h and Opteron G1 guests.

* Rearranged MSR #defines based on Boris's suggestion.

* Changed the logic of mapping MSR to gp_counters[] index based on
Boris's feedback.
* Removed use of family checks based on Radim's feedback.
* Removed KVM bugfix patch since it is already applied.

* Rebased to latest KVM tree.

Janakarajan Natarajan (3):
x86/msr: Add AMD Core Perf Extension MSRs
x86/kvm: Add support for AMD Core Perf Extension in guest
x86/kvm: Expose AMD Core Perf Extension flag to guests

arch/x86/include/asm/msr-index.h | 14 ++++
arch/x86/kvm/cpuid.c | 8 ++-
arch/x86/kvm/pmu_amd.c | 140 +++++++++++++++++++++++++++++++++++----
arch/x86/kvm/x86.c | 1 +
4 files changed, 148 insertions(+), 15 deletions(-)


 \ /
  Last update: 2018-01-30 18:34    [W:0.102 / U:4.744 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site