KVM: nVMX: introduce nested_vmx_load_cr3 and call it on vmentry
authorLadi Prosek <lprosek@redhat.com>
Wed, 30 Nov 2016 15:03:10 +0000 (16:03 +0100)
committerPaolo Bonzini <pbonzini@redhat.com>
Thu, 8 Dec 2016 14:31:10 +0000 (15:31 +0100)
commit9ed38ffad47316dbdc16de0de275868c7771754d
treeb850a0a07f6fa96a8f60cca1bcc6a628feaddc69
parentee146c1c100dbe9ca92252be2e901b957476b253
KVM: nVMX: introduce nested_vmx_load_cr3 and call it on vmentry

Loading CR3 as part of emulating vmentry is different from regular CR3 loads,
as implemented in kvm_set_cr3, in several ways.

* different rules are followed to check CR3 and it is desirable for the caller
to distinguish between the possible failures
* PDPTRs are not loaded if PAE paging and nested EPT are both enabled
* many MMU operations are not necessary

This patch introduces nested_vmx_load_cr3 suitable for CR3 loads as part of
nested vmentry and vmexit, and makes use of it on the nested vmentry path.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
arch/x86/include/asm/kvm_host.h
arch/x86/kvm/vmx.c
arch/x86/kvm/x86.c