[RFC PATCH v2 00/10] kvmppc: Paravirtualize KVM to support ultravisor

[Claudio Carvalho]

POWER platforms that supports the Protected Execution Facility (PEF)
introduce features that combine hardware facilities and firmware to
enable secure virtual machines. That includes a new processor mode
(ultravisor mode) and the ultravisor firmware.

In PEF enabled systems, the ultravisor firmware runs at a privilege
level above the hypervisor and also takes control over some system
resources. The hypervisor, though, can make system calls to access these
resources. Such system calls, a.k.a. ucalls, are handled by the
ultravisor firmware.

The processor allows part of the system memory to be configured as
secure memory, and introduces a a new mode, called secure mode, where
any software entity in that mode can access secure memory. The
hypervisor doesn't (and can't) run in secure mode, but a secure guest
and the ultravisor firmware do.

This patch set adds support for ultravisor calls and do some preparation
for running secure guests

---
Changelog:
---
v1->v2:
 - Addressed comments from Paul Mackerras:
     - Write the pate in HV's table before doing that in UV's
     - Renamed and better documented the ultravisor header files. Also added
       all possible return codes for each ucall
     - Updated the commit message that introduces the MSR_S bit
     - Moved ultravisor.c and ucall.S to arch/powerpc/kernel
     - Changed ucall.S to not save CR
 - Rebased
 - Changed the patches order
 - Updated several commit messages
 - Added FW_FEATURE_ULTRAVISOR to enable use of firmware_has_feature()
 - Renamed CONFIG_PPC_KVM_UV to CONFIG_PPC_UV and used it to ifdef the ucall
   handler and the code that populates the powerpc_firmware_features for 
   ultravisor
 - Exported the ucall symbol. KVM may be built as module.
 - Restricted LDBAR access if the ultravisor firmware is available
 - Dropped patches:
     "[PATCH 06/13] KVM: PPC: Ultravisor: UV_RESTRICTED_SPR_WRITE ucall"
     "[PATCH 07/13] KVM: PPC: Ultravisor: UV_RESTRICTED_SPR_READ ucall"
     "[PATCH 08/13] KVM: PPC: Ultravisor: fix mtspr and mfspr"
 - Squashed patches:
     "[PATCH 09/13] KVM: PPC: Ultravisor: Return to UV for hcalls from SVM"
     "[PATCH 13/13] KVM: PPC: UV: Have fast_guest_return check secure_guest"

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

Claudio Carvalho (1):
  powerpc: Introduce FW_FEATURE_ULTRAVISOR

Michael Anderson (2):
  KVM: PPC: Ultravisor: Use UV_WRITE_PATE ucall to register a PATE
  KVM: PPC: Ultravisor: Check for MSR_S during hv_reset_msr

Paul Mackerras (1):
  KVM: PPC: Book3S HV: Fixed for running secure guests

Ram Pai (3):
  KVM: PPC: Ultravisor: Add generic ultravisor call handler
  KVM: PPC: Ultravisor: Restrict flush of the partition tlb cache
  KVM: PPC: Ultravisor: Restrict LDBAR access

Sukadev Bhattiprolu (2):
  KVM: PPC: Ultravisor: Introduce the MSR_S bit
  KVM: PPC: Ultravisor: Return to UV for hcalls from SVM

 arch/powerpc/Kconfig                         | 20 ++++++
 arch/powerpc/include/asm/firmware.h          |  5 +-
 arch/powerpc/include/asm/kvm_host.h          |  1 +
 arch/powerpc/include/asm/reg.h               |  3 +
 arch/powerpc/include/asm/ultravisor-api.h    | 24 ++++++++
 arch/powerpc/include/asm/ultravisor.h        | 49 +++++++++++++++
 arch/powerpc/kernel/Makefile                 |  1 +
 arch/powerpc/kernel/asm-offsets.c            |  1 +
 arch/powerpc/kernel/prom.c                   |  6 ++
 arch/powerpc/kernel/ucall.S                  | 31 ++++++++++
 arch/powerpc/kernel/ultravisor.c             | 30 +++++++++
 arch/powerpc/kvm/book3s_64_mmu_hv.c          |  1 +
 arch/powerpc/kvm/book3s_hv.c                 |  4 +-
 arch/powerpc/kvm/book3s_hv_rmhandlers.S      | 40 ++++++++++--
 arch/powerpc/mm/book3s64/hash_utils.c        |  3 +-
 arch/powerpc/mm/book3s64/pgtable.c           | 65 +++++++++++++++-----
 arch/powerpc/mm/book3s64/radix_pgtable.c     |  9 ++-
 arch/powerpc/perf/imc-pmu.c                  | 64 +++++++++++--------
 arch/powerpc/platforms/powernv/idle.c        |  6 +-
 arch/powerpc/platforms/powernv/subcore-asm.S |  4 ++
 20 files changed, 311 insertions(+), 56 deletions(-)
 create mode 100644 arch/powerpc/include/asm/ultravisor-api.h
 create mode 100644 arch/powerpc/include/asm/ultravisor.h
 create mode 100644 arch/powerpc/kernel/ucall.S
 create mode 100644 arch/powerpc/kernel/ultravisor.c

-- 
2.20.1