[Qemu-devel] [PATCH v10 00/29] x86: Secure Encrypted Virtualization (AMD)

[Brijesh Singh]

This patch series provides support for AMD's new Secure Encrypted 
Virtualization (SEV) feature.

SEV is an extension to the AMD-V architecture which supports running
multiple VMs under the control of a hypervisor. The SEV feature allows
the memory contents of a virtual machine (VM) to be transparently encrypted
with a key unique to the guest VM. The memory controller contains a
high performance encryption engine which can be programmed with multiple
keys for use by a different VMs in the system. The programming and
management of these keys is handled by the AMD Secure Processor firmware
which exposes a commands for these tasks.

The KVM SEV patch series introduced a new ioctl (KVM_MEMORY_ENCRYPTION_OP)
which is used by qemu to issue the SEV commands to assist performing
common hypervisor activities such as a launching, running, snapshooting,
migration and debugging guests.

The following links provide additional details:

AMD Memory Encryption whitepaper:
 
http://amd-dev.wpengine.netdna-cdn.com/wordpress/media/2013/12/AMD_Memory_Encryption_Whitepaper_v7-Public.pdf

AMD64 Architecture Programmer's Manual:
http://support.amd.com/TechDocs/24593.pdf
SME is section 7.10
SEV is section 15.34

Secure Encrypted Virutualization Key Management:
http://support.amd.com/TechDocs/55766_SEV-KM API_Specification.pdf

KVM Forum slides:
http://www.linux-kvm.org/images/7/74/02x08A-Thomas_Lendacky-AMDs_Virtualizatoin_Memory_Encryption_Technology.pdf

Video of the KVM Forum Talk:
https://www.youtube.com/watch?v=RcvQ1xN55Ew

---

The complete patch series is available :
https://github.com/codomania/qemu/tree/v10

Using these patches we have succesfully booted and tested a guest both with and
without SEV enabled.

TODO:

* Add SEV guest migration support
* Add SEV guest snapshot and restore support

Changes since v9:
- move sev specific header definition in target/i386/sev_i386.h
- add new QMP query-sev-capabilities - the command will be used by libvirt
  to query the SEV capabilities information.
- move sev specific QMP command implementation in target/i386/monitor.c. The
  sev commands are disabled for non x86 architecture
- update 'info sev' command to display human readiable format for policy
- use g_new0 to allocate to structure memory
- update qemu-options.hx to include cbitspos and reduced-phys-bit field

Changes since v8:
- update 'query-sev' command to use enum type for SEV state.
- populate memory encryption cpuid when only SEV is enabled.


Changes since v7:
- move sev.c from accel/kvm to target/i386
- update query-sev-launch-measure to return error when measurement is not 
available
- update flatview_read to use slow path when attrs.debug=1 is set
- fix the buffer overflow
- use '-' when adding new member in SevInfo QMP structure

Changes since v6:
- add support to specify cbitpos in sev-guest object
- add 'info sev' HMP command
- add 'query-sev' and 'query-launch-measure' QMP commands
- rework the logic to query the memory encryption mask when walking
  guest pagetable for debug

Changes since v5:
- drop MEMTXTATTRS_DEBUG macro, caller now specify attrs.debug=1 when needed.
- drop DPRINTF and use trace points to output the debug messages

Changes since v4:
- extend sev-guest object to add new properties 'dh-cert-file', 'session-file' 
etc.
- emit SEV_MEASUREMENT event when measurement is available
- add migration blocker
- add memory encryption cpuid support
- rebase the series with recent qemu tree

Changes since v3:
- update to newer SEV spec (0.12 -> 0.14)
- update to newer KVM RFC and use KVM_MEMORY_ENCRYPTION_OP ioctl instead
of KVM_ISSUE_SEV.
- add support to encrypt plfash

Changes since v2:
- rename ram_ops to ram_debug_ops
- use '-' rather than '_' when adding new member in KvmInfo struct
- update sev object to use link properties when referencing other objects
- use ldq_phys_debug in tlb_info_64 and mem_info_64.
- remove sev-guest-policy object, we will revisit it after basic SEV
guest support is merged.
- remove kernel API from doc and add SEV guest LAUNCH model. The doc will
be updated as we integerate the remaining SEV APIs.

Changes since v1:
- Added Documentation
- Added security-policy object.
- Drop sev config parsing support and create new objects to get/set SEV
specific parameters
- Added sev-guest-info object.
- Added sev-launch-info object.
- Added kvm_memory_encrytion_* APIs. The idea behind this was to allow adding
a non SEV memory encrytion object without modifying interfaces.
- Drop patch to load OS image at fixed location.
- updated LAUNCH_FINISH command structure. Now the structure contains
just 'measurement' field. Other fields are not used and will also be removed
from newer SEV firmware API spec.

Brijesh Singh (28):
  memattrs: add debug attribute
  exec: add ram_debug_ops support
  exec: add debug version of physical memory read and write API
  monitor/i386: use debug APIs when accessing guest memory
  machine: add -memory-encryption property
  kvm: update kvm.h to include memory encryption ioctls
  docs: add AMD Secure Encrypted Virtualization (SEV)
  target/i386: add Secure Encrypted Virtulization (SEV) object
  qmp: add query-sev command
  include: add psp-sev.h header file
  sev/i386: add command to initialize the memory encryption context
  sev/i386: register the guest memory range which may contain encrypted
    data
  kvm: introduce memory encryption APIs
  hmp: add 'info sev' command
  sev/i386: add command to create launch memory encryption context
  sev/i386: add command to encrypt guest memory region
  target/i386: encrypt bios rom
  sev/i386: add support to LAUNCH_MEASURE command
  sev/i386: finalize the SEV guest launch flow
  hw/i386: set ram_debug_ops when memory encryption is enabled
  sev/i386: add debug encrypt and decrypt commands
  target/i386: clear C-bit when walking SEV guest page table
  qmp: add query-sev-launch-measure command
  sev/i386: add migration blocker
  cpu/i386: populate CPUID 0x8000_001F when SEV is active
  qmp: add query-sev-capabilities command
  sev/i386: add sev_get_capabilities()
  tests/qmp-test: blacklist sev specific qmp commands

 accel/kvm/kvm-all.c            |  48 +++
 accel/stubs/kvm-stub.c         |  14 +
 cpus.c                         |   2 +-
 disas.c                        |   2 +-
 docs/amd-memory-encryption.txt | 109 ++++++
 exec.c                         |  83 +++-
 hmp-commands-info.hx           |  16 +
 hmp.h                          |   1 +
 hw/core/machine.c              |  22 ++
 hw/i386/pc.c                   |   9 +
 hw/i386/pc_sysfw.c             |  19 +
 include/exec/cpu-common.h      |  15 +
 include/exec/memattrs.h        |   2 +
 include/exec/memory.h          |  30 +-
 include/hw/boards.h            |   1 +
 include/sysemu/kvm.h           |  25 ++
 include/sysemu/sev.h           |  22 ++
 linux-headers/linux/kvm.h      |  90 +++++
 linux-headers/linux/psp-sev.h  | 142 +++++++
 monitor.c                      |  27 +-
 qapi-schema.json               | 132 +++++++
 qemu-options.hx                |  49 ++-
 stubs/Makefile.objs            |   1 +
 stubs/sev.c                    |  30 ++
 target/i386/Makefile.objs      |   4 +-
 target/i386/cpu.c              |  13 +
 target/i386/helper.c           |  31 +-
 target/i386/monitor.c          | 193 ++++++---
 target/i386/sev-stub.c         |  51 +++
 target/i386/sev.c              | 860 +++++++++++++++++++++++++++++++++++++++++
 target/i386/sev_i386.h         |  93 +++++
 target/i386/trace-events       |  11 +
 tests/qmp-test.c               |   5 +
 33 files changed, 2067 insertions(+), 85 deletions(-)
 create mode 100644 docs/amd-memory-encryption.txt
 create mode 100644 include/sysemu/sev.h
 create mode 100644 linux-headers/linux/psp-sev.h
 create mode 100644 stubs/sev.c
 create mode 100644 target/i386/sev-stub.c
 create mode 100644 target/i386/sev.c
 create mode 100644 target/i386/sev_i386.h

-- 
2.14.3