From 93c4adc7afedf9b0ec190066d45b6d67db5270da Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Wed, 5 Mar 2014 23:19:52 +0100 Subject: [PATCH] KVM: x86: handle missing MPX in nested virtualization When doing nested virtualization, we may be able to read BNDCFGS but still not be allowed to write to GUEST_BNDCFGS in the VMCS. Guard writes to the field with vmx_mpx_supported(), and similarly hide the MSR from userspace if the processor does not support the field. We could work around this with the generic MSR save/load machinery, but there is only a limited number of MSR save/load slots and it is not really worthwhile to waste one for a scenario that should not happen except in the nested virtualization case. Signed-off-by: Paolo Bonzini --- Reading git-format-patch failed