On 22/12/18 21:59, Ingo Molnar wrote: > > * Paolo Bonzini <[email protected]> wrote: > >> On 21/12/18 23:40, Borislav Petkov wrote: >>> + mingo. >>> >>> On Fri, Dec 21, 2018 at 02:09:02PM +0100, Paolo Bonzini wrote: >>>> Linus, >>>> >>>> The following changes since commit >>>> 7566ec393f4161572ba6f11ad5171fd5d59b0fbd: >>>> >>>> Linux 4.20-rc7 (2018-12-16 15:46:55 -0800) >>>> >>>> are available in the git repository at: >>>> >>>> https://git.kernel.org/pub/scm/virt/kvm/kvm.git tags/for-linus >>>> >>>> for you to fetch changes up to 3cf85f9f6bd7b172122865432b4c6f0ec844e22a: >>>> >>>> KVM: x86: nSVM: fix switch to guest mmu (2018-12-19 22:19:22 +0100) >>>> >>>> A simple patch for a pretty bad bug. I haven't yet sent my 4.21 pull >>>> request because currently I'm waiting for a patch to be removed from >>>> tip (MPX removal breaks KVM live migration and was committed without >>>> Cc or Ack from me) and until that happens I cannot finalize my >>>> conflict resolution instructions. >>> >>> Lemme make sure I understand it correctly: you'd like us to not send >>> >>> https://git.kernel.org/tip/eb012ef3b4e331ae479dd7cd9378041d9b7f851c >>> >>> up now and delay it for 4.22, right? >> >> Right, and also I will have to provide you with a topic branch to base >> that patch on. > > Ok - x86/mpx delayed for v4.22 at least. > > Can we turn off CONFIG_X86_INTEL_MPX configurability in the Kconfig, via > a patch like below? > > Thanks, > > Ingo > > arch/x86/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 8689e794a43c..20fd5695f265 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -1870,6 +1870,7 @@ config X86_INTEL_MPX > def_bool n > # Note: only available in 64-bit mode due to VMA flags shortage > depends on CPU_SUP_INTEL && X86_64 > + depends on DEPRECATED > select ARCH_USES_HIGH_VMA_FLAGS > ---help--- > MPX provides hardware features that can be used in >
I think so, you can even delete all X86_INTEL_MPX code already. All that KVM still needs is that BNDCSR and BNDREGS remain in XCR0, I don't see anything that affects that depending on X86_INTEL_MPX. Thanks, Paolo
