x86/KVM/VMX: Expose SPEC_CTRL Bit(2) to the guest
authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Thu, 26 Apr 2018 02:04:25 +0000 (22:04 -0400)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 3 May 2018 11:55:49 +0000 (13:55 +0200)
commitda39556f66f5cfe8f9c989206974f1cb16ca5d7c
treeb4f43a8816bd1cf8248c0a2abc60e4d5fe1a1b56
parent764f3c21588a059cd783c6ba0734d4db2d72822d
x86/KVM/VMX: Expose SPEC_CTRL Bit(2) to the guest

Expose the CPUID.7.EDX[31] bit to the guest, and also guard against various
combinations of SPEC_CTRL MSR values.

The handling of the MSR (to take into account the host value of SPEC_CTRL
Bit(2)) is taken care of in patch:

  KVM/SVM/VMX/x86/spectre_v2: Support the combination of guest and host IBRS

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kvm/cpuid.c
arch/x86/kvm/vmx.c