KVM: SVM: Move spec control call after restore of GS
authorThomas Gleixner <tglx@linutronix.de>
Fri, 11 May 2018 13:21:01 +0000 (15:21 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 17 May 2018 15:09:16 +0000 (17:09 +0200)
commit15e6c22fd8e5a42c5ed6d487b7c9fe44c2517765
treea672809b542f900bddd85d7a3deea581913ebe58
parent5f2b745f5e1304f438f9b2cd03ebc8120b6e0d3b
KVM: SVM: Move spec control call after restore of GS

svm_vcpu_run() invokes x86_spec_ctrl_restore_host() after VMEXIT, but
before the host GS is restored. x86_spec_ctrl_restore_host() uses 'current'
to determine the host SSBD state of the thread. 'current' is GS based, but
host GS is not yet restored and the access causes a triple fault.

Move the call after the host GS restore.

Fixes: 885f82bfbc6f x86/process: Allow runtime control of Speculative Store Bypass
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/svm.c