[v6,0/7] KVMPPC driver to manage secure guest pages
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Message ID 20190809084108.30343-1-bharata@linux.ibm.com
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  • KVMPPC driver to manage secure guest pages
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Bharata B Rao Aug. 9, 2019, 8:41 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 char device. Whenever a page belonging to the guest becomes
secure, a page from this private device memory is used to
represent and track that secure page on the HV side. The movement
of pages between normal and secure memory is done via
migrate_vma_pages().

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 are against Christoph Hellwig's migrate_vma-cleanup.2
branch
(http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/migrate_vma-cleanup.2)

plus

Claudio Carvalho's base ultravisor enablement patchset
(https://lore.kernel.org/linuxppc-dev/20190808040555.2371-1-cclaudio@linux.ibm.com/T/#t)

These patches along with Claudio's above patches are required to
run a secure pseries guest on KVM.

Changes in v6
=============
Updated the driver to account for the changes in HMM and migrate_vma()
by Christoph Hellwig.
 - Not using any HMM routines any more.
 - Switched to using migrate_vma_pages()

v5: https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg153294.html

Anshuman Khandual (1):
  KVM: PPC: Ultravisor: Add PPC_UV config option

Bharata B Rao (6):
  kvmppc: 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

 Documentation/virtual/kvm/api.txt          |  18 +
 arch/powerpc/Kconfig                       |  18 +
 arch/powerpc/include/asm/hvcall.h          |   9 +
 arch/powerpc/include/asm/kvm_book3s_devm.h |  48 ++
 arch/powerpc/include/asm/kvm_host.h        |  28 +
 arch/powerpc/include/asm/kvm_ppc.h         |   2 +
 arch/powerpc/include/asm/ultravisor-api.h  |   6 +
 arch/powerpc/include/asm/ultravisor.h      |  36 ++
 arch/powerpc/kvm/Makefile                  |   3 +
 arch/powerpc/kvm/book3s_64_mmu_radix.c     |  22 +
 arch/powerpc/kvm/book3s_hv.c               | 115 ++++
 arch/powerpc/kvm/book3s_hv_devm.c          | 668 +++++++++++++++++++++
 arch/powerpc/kvm/powerpc.c                 |  12 +
 include/uapi/linux/kvm.h                   |   1 +
 14 files changed, 986 insertions(+)
 create mode 100644 arch/powerpc/include/asm/kvm_book3s_devm.h
 create mode 100644 arch/powerpc/kvm/book3s_hv_devm.c