[Xen-devel] [PATCH 0/2] x86/VMX: fix for vmentry failure with TSX bits in LBR

[Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>]

The first patch is a general optimization which is nice to have prior
to the second patch which contains the real fix.

A similar bug was fixed in Linux's perf subsystem in Jun 2016:

    commit 19fc9ddd61e059cc45464bdf6e8fa304bb94080f
    ("perf/x86/intel: Fix MSR_LAST_BRANCH_FROM_x bug when no TSX")

But the issue affects virtualized systems in a more severe way since
all LBR entries have to be fixed during vmentry.

Sergey Dyasli (2):
  x86/VMX: introduce vmx_find_guest_msr()
  x86/VMX: fix vmentry failure with TSX bits in LBR

 xen/arch/x86/hvm/vmx/vmcs.c        | 80 +++++++++++++++++++++++++++++---------
 xen/arch/x86/hvm/vmx/vmx.c         | 68 ++++++++++++++++++++++++++++++++
 xen/include/asm-x86/cpufeature.h   |  3 ++
 xen/include/asm-x86/hvm/vmx/vmcs.h |  3 ++
 4 files changed, 136 insertions(+), 18 deletions(-)

-- 
2.7.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel