]> git.baikalelectronics.ru Git - kernel.git/commit
KVM/x86: Remove indirect MSR op calls from SPEC_CTRL
authorPaolo Bonzini <pbonzini@redhat.com>
Thu, 22 Feb 2018 15:43:17 +0000 (16:43 +0100)
committerIngo Molnar <mingo@kernel.org>
Fri, 23 Feb 2018 07:24:35 +0000 (08:24 +0100)
commit6004868a644f9cc70907dcc3b95ed2e9aa8c9b20
tree5c309f49fee88e9690ead6beac4c9b3e70aa7d3c
parent3570e93f0847037c9ce8bdc7a144f2c8f45b543c
KVM/x86: Remove indirect MSR op calls from SPEC_CTRL

Having a paravirt indirect call in the IBRS restore path is not a
good idea, since we are trying to protect from speculative execution
of bogus indirect branch targets.  It is also slower, so use
native_wrmsrl() on the vmentry path too.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: KarimAllah Ahmed <karahmed@amazon.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kvm@vger.kernel.org
Cc: stable@vger.kernel.org
Fixes: dcfe2f686c263f3c01015b4e299a3faf2f5db7f5
Link: http://lkml.kernel.org/r/20180222154318.20361-2-pbonzini@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kvm/svm.c
arch/x86/kvm/vmx.c