[v4,0/6] kvmppc: HMM driver to manage pages of secure guest

Message

Bharata B Rao May 28, 2019, 6:49 a.m. UTC

Hi,

A pseries guest can be run as a secure guest on Ultravisor-enabled
POWER platforms. On such platforms, this driver will be used to manage
the movement of guest pages between the normal memory managed by
hypervisor (HV) and secure memory managed by Ultravisor (UV).

Private ZONE_DEVICE memory equal to the amount of secure memory
available in the platform for running secure guests is created
via a HMM device. The movement of pages between normal and secure
memory is done by ->alloc_and_copy() callback routine of migrate_vma().

The page-in or page-out requests from UV will come to HV as hcalls and
HV will call back into UV via uvcalls to satisfy these page requests.

These patches apply and work on top of the base Ultravisor patches
posted by Claudio Carvalho at:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2019-May/190694.html

In this version, the last two patches are the new additions.

Changes in v4
=============
- Handling HV side page invalidations by issuing UV_PAGE_INVAL ucall
- Handling HV side radix page faults by sending the page to UV
- Support for rebooting a secure guest
- Some cleanups and code reorgs

v3: https://lists.ozlabs.org/pipermail/linuxppc-dev/2019-January/184731.html

Bharata B Rao (6):
  kvmppc: HMM backend driver to manage pages of secure guest
  kvmppc: Shared pages support for secure guests
  kvmppc: H_SVM_INIT_START and H_SVM_INIT_DONE hcalls
  kvmppc: Handle memory plug/unplug to secure VM
  kvmppc: Radix changes for secure guest
  kvmppc: Support reset of secure guest

 arch/powerpc/include/asm/hvcall.h         |   9 +
 arch/powerpc/include/asm/kvm_book3s_hmm.h |  41 ++
 arch/powerpc/include/asm/kvm_host.h       |  37 ++
 arch/powerpc/include/asm/kvm_ppc.h        |   4 +
 arch/powerpc/include/asm/ultravisor-api.h |   6 +
 arch/powerpc/include/asm/ultravisor.h     |  47 ++
 arch/powerpc/kvm/Makefile                 |   3 +
 arch/powerpc/kvm/book3s_64_mmu_radix.c    |  19 +
 arch/powerpc/kvm/book3s_hv.c              |  69 +++
 arch/powerpc/kvm/book3s_hv_hmm.c          | 666 ++++++++++++++++++++++
 arch/powerpc/kvm/powerpc.c                |  12 +
 include/uapi/linux/kvm.h                  |   1 +
 tools/include/uapi/linux/kvm.h            |   1 +
 13 files changed, 915 insertions(+)
 create mode 100644 arch/powerpc/include/asm/kvm_book3s_hmm.h
 create mode 100644 arch/powerpc/kvm/book3s_hv_hmm.c