[Patch 0/4] Defer page pinning for SEV guests until guest pages touched

[eric van tassell <Eric.VanTassell@amd.com>]

Overview
========
	Defer pinning of the guest's pages until nested page faults occur
	to improve startup time and reduce memory pressure for SEV guests.

	Cease paying the computational cost of pinning all pages when an
	encrypted region is registered, before it is known if they will be accessed.

	Cease creating the memory pressure due to  pinning all pages when an
	encrypted region is registered before, it is known if they will be accessed.

Timing Results
==========
All timings are done by hand with and Android stopwatch app

SEV guest size(GiB)  	     |  4 |  8 | 16 | 32 | 60 |
without patch series(sec)    |  2 |  3 |  4 |  8 | 14 |
with patch series (sec)      |  1 |  1 |  1 |  1 |  1 |

Applies To:
===========
	This patch applies top of this commit from the <next> branch of
	the kvm tree:
	    c34b26b98cac   Tianjia Zhang : KVM: MIPS: clean up redundant 'kvm_run' parameters

eric van tassell (4):
  KVM:MMU: Introduce the set_spte_notify() callback
  KVM:SVM: Introduce set_spte_notify support
  KVM:SVM: Pin sev_launch_update_data() pages via sev_get_page()
  KVM:SVM: Remove struct enc_region and associated pinned page tracking.

 arch/x86/include/asm/kvm_host.h |   3 +
 arch/x86/kvm/mmu/mmu.c          |  31 ++++-
 arch/x86/kvm/mmu/paging_tmpl.h  |  27 ++--
 arch/x86/kvm/svm/sev.c          | 232 ++++++++++++++++----------------
 arch/x86/kvm/svm/svm.c          |   2 +
 arch/x86/kvm/svm/svm.h          |   4 +-
 6 files changed, 169 insertions(+), 130 deletions(-)

-- 
2.17.1