]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
x86/kvm: Update spectre-v1 mitigation
authorDan Williams <dan.j.williams@intel.com>
Thu, 1 Feb 2018 01:47:03 +0000 (17:47 -0800)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 1 Feb 2018 09:59:10 +0000 (10:59 +0100)
commit085331dfc6bbe3501fb936e657331ca943827600
tree0d232c6ca05ee32350962d32d351520394dae0c9
parent12c69f1e94c89d40696e83804dd2f0965b5250cd
x86/kvm: Update spectre-v1 mitigation

Commit 75f139aaf896 "KVM: x86: Add memory barrier on vmcs field lookup"
added a raw 'asm("lfence");' to prevent a bounds check bypass of
'vmcs_field_to_offset_table'.

The lfence can be avoided in this path by using the array_index_nospec()
helper designed for these types of fixes.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andrew Honig <ahonig@google.com>
Cc: kvm@vger.kernel.org
Cc: Jim Mattson <jmattson@google.com>
Link: https://lkml.kernel.org/r/151744959670.6342.3001723920950249067.stgit@dwillia2-desk3.amr.corp.intel.com
arch/x86/kvm/vmx.c