[PATCH 0/2] KVM: x86: Fastpath userspace exit fix and hardening

[Sean Christopherson <seanjc@google.com>]

Fix a found-by-inspection bug where KVM could fail to flush the PML buffer
(VMX) or fail to grab the most recet CR0/CR3 (SVM) prior to exiting to
userspace, which could prove to be fatal if that exit is that last exit prior
to save/restore, e.g. the last exit before userspace commits to migrating the
VM.

Patch 2 is related hardening, i.e. isn't fixing any existing bugs (AFAIK).

Sean Christopherson (2):
  KVM: x86: Ensure vendor's exit handler runs before fastpath userspace
    exits
  KVM: SVM: Refresh vcpu->arch.cr{0,3} prior to invoking fastpath
    handler

 arch/x86/kvm/svm/svm.c | 15 ++++++++-------
 arch/x86/kvm/vmx/vmx.c |  3 +++
 arch/x86/kvm/x86.c     |  3 ---
 3 files changed, 11 insertions(+), 10 deletions(-)


base-commit: 85f871f6ba46f20d7fbc0b016b4db648c33220dd
-- 
2.54.0.545.g6539524ca2-goog