On Wed, Apr 18, 2018 at 11:18:30AM +0800, Youquan Song wrote: > From: Paolo Bonzini <pbonzini@xxxxxxxxxx> > > commit ecb586bd29c99fb4de599dec388658e74388daad upstream. > > 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@xxxxxxxxxx> > Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx> > Cc: David Woodhouse <dwmw@xxxxxxxxxxxx> > Cc: KarimAllah Ahmed <karahmed@xxxxxxxxx> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Cc: kvm@xxxxxxxxxxxxxxx > Cc: stable@xxxxxxxxxxxxxxx > Fixes: d28b387fb74da95d69d2615732f50cceb38e9a4d > Link: http://lkml.kernel.org/r/20180222154318.20361-2-pbonzini@xxxxxxxxxx > Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> > Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx> [v4.4 backport] > > Conflicts: > arch/x86/kvm/svm.c Ugh :(
