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)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 22 May 2018 16:54:02 +0000 (18:54 +0200)
commit97224b3da69810155b44f173cc8959eea565a98d
tree8216eadca1d1fd01fc296587d0996f773cbf1fed
parent716bfae3b3f40de8c0a6ae83f199d96fd152b3cc
x86/KVM/VMX: Expose SPEC_CTRL Bit(2) to the guest

commit da39556f66f5cfe8f9c989206974f1cb16ca5d7c upstream

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/kvm/cpuid.c
arch/x86/kvm/vmx.c