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Re: [PATCH v4 00/33] Qemu SGX virtualization


From: Yang Zhong
Subject: Re: [PATCH v4 00/33] Qemu SGX virtualization
Date: Thu, 29 Jul 2021 20:27:20 +0800
User-agent: Mutt/1.5.21 (2010-09-15)

On Wed, Jul 28, 2021 at 05:57:51PM +0200, Paolo Bonzini wrote:
> On 19/07/21 13:21, Yang Zhong wrote:
> >Since Sean Christopherson has left Intel and i am responsible for Qemu SGX
> >upstream work. His @intel.com address will be bouncing and his new email(
> >seanjc@google.com) is also in CC lists.
> >
> >This series is Qemu SGX virtualization implementation rebased on latest
> >Qemu release. The numa support for SGX will be sent in another patchset
> >once this basic SGX patchset are merged.
> >
> >You can find Qemu repo here:
> >
> >     https://github.com/intel/qemu-sgx.git upstream
> >
> >If you want to try SGX, you can directly install the linux release(at least 
> >5.13.0-rc1+)
> >since kvm SGX has been merged into linux release.
> >
> >     https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >
> >To simplify, you'd better install linux on host and guest, which can support
> >SGX on host and guest kernel. And to me, use below reference command to boot
> >SGX guest:
> >
> >     #qemu-system-x86_64 \
> >         ...... \
> >         -cpu host,+sgx-provisionkey \
> >         -object memory-backend-epc,id=mem1,size=64M,prealloc=on \
> >         -object memory-backend-epc,id=mem2,size=28M \
> >         -M sgx-epc.0.memdev=mem1,sgx-epc.1.memdev=mem2
> >
> >Overview
> >========
> >
> >Intel Software Guard eXtensions (SGX) is a set of instructions and mechanisms
> >for memory accesses in order to provide security accesses for sensitive
> >applications and data. SGX allows an application to use it's pariticular
> >address space as an *enclave*, which is a protected area provides 
> >confidentiality
> >and integrity even in the presence of privileged malware. Accesses to the
> >enclave memory area from any software not resident in the enclave are 
> >prevented,
> >including those from privileged software.
> >
> >SGX virtaulization
> >==================
> >
> >The KVM SGX creates one new misc device, sgx_vepc, and Qemu will open 
> >'/dev/sgx_vepc'
> >device node to mmap() host EPC memory to guest. The Qemu also adds 'sgx-epc' 
> >device
> >to expose EPC sections to guest through CPUID and ACPI table.  The Qemu SGX 
> >also
> >supports multiple virtual EPC sections to guest, we just put them together 
> >physically
> >contiguous for the sake of simplicity. The kernel SGX NUMA has been merged 
> >into Linux
> >tip tree, we will support this function in the next phase.
> >
> >Although the current host SGX subsystem can not support SGX2 feature, the 
> >KVM/Qemu
> >implementation still expose this feature to guest. Guest SGX2 support 
> >doesn't have
> >interaction with host kernel SGX driver, the SGX guest can normally use 
> >those new
> >instructions.
> >
> >As for SGX virtualization detailed infomation, please reference 
> >docs/intel-sgx.txt
> >docuement(patch 33).
> >
> >Changelog:
> >=========
> >
> >(Changelog here is for global changes, please see each patch's changelog for 
> >changes
> >made to specific patch.)
> >
> >v3-->v4:
> >    - Rebased the sgx patches into latest Qemu release.
> >    - Moved sgx compound property setter/getter from MachineState to 
> > X86MachineState(Paolo).
> >    - Re-defined struct SgxEPC, removed 'id' property and added struct 
> > SgxEPCList for
> >      sgx-epc.0.{memdev}(Paolo).
> >    - Removed g_malloc0(), and changed the 'SGXEPCState *sgx_epc' to 
> > 'SGXEPCState sgx_epc'
> >      in struct PCMachineState(Paolo).
> >    - Changed the SGX compound property cmdline from sgx-epc.{memdev}.0 to
> >      sgx-epc.0.{memdev}(Paolo).
> >    - Removed the signature from the 'git format-patch' command(Jarkko).
> >
> >v2-->v3:
> >    - Rebased the sgx patches into latest Qemu release.
> >    - Implemented the compound property for SGX, ref patch5, the command 
> > from '-sgx-epc'
> >      to '-M'(Paolo).
> >    - Moved the sgx common code from sgx-epc.c to sgx.c. The sgx-epc.c is
> >      only responsible for virtual epc device.
> >    - Removed the previous patch13(linux-headers: Add placeholder for 
> > KVM_CAP_SGX_ATTRIBUTE)
> >      because ehabkost@redhat.com updated Linux headers to 5.13-rc4 with 
> > commit 278f064e452.
> >    - Updated the patch1 because ram_flags were changed by David Hildenbra.
> >    - Added one patch24, which avoid reset operation caused by bios reset.
> >    - Added one patch25, which make prealloc property consistent with Qemu 
> > cmdline during VM
> >      reset.
> >
> >v1-->v2:
> >    - Rebased the sgx patches into latest Qemu release.
> >    - Unified the "share" and "protected" arguments with ram_flags in the
> >      memory_region_init_ram_from_fd()(Paolo).
> >    - Added the new MemoryBackendEpcProperties and related documents(Eric 
> > Blake).
> >    - Changed the KVM_CAP_SGX_ATTRIBUTE from 195 to 196(Kai).
> >    - Changed the version and some grammar issues(Eric Blake).
> 
> Looks good, I will queue it for 6.2.
> 
> Thanks for your patience with the compound machine properties support.
>

  Paolo, thanks! Once this patchset is merged, i will send SGX NUMA patchset, 
thanks!

  Regards,

  Yang


 
> Paolo
> 
> >Sean Christopherson (21):
> >   memory: Add RAM_PROTECTED flag to skip IOMMU mappings
> >   hostmem: Add hostmem-epc as a backend for SGX EPC
> >   i386: Add 'sgx-epc' device to expose EPC sections to guest
> >   vl: Add sgx compound properties to expose SGX EPC sections to guest
> >   i386: Add primary SGX CPUID and MSR defines
> >   i386: Add SGX CPUID leaf FEAT_SGX_12_0_EAX
> >   i386: Add SGX CPUID leaf FEAT_SGX_12_0_EBX
> >   i386: Add SGX CPUID leaf FEAT_SGX_12_1_EAX
> >   i386: Add get/set/migrate support for SGX_LEPUBKEYHASH MSRs
> >   i386: Add feature control MSR dependency when SGX is enabled
> >   i386: Update SGX CPUID info according to hardware/KVM/user input
> >   i386: kvm: Add support for exposing PROVISIONKEY to guest
> >   i386: Propagate SGX CPUID sub-leafs to KVM
> >   Adjust min CPUID level to 0x12 when SGX is enabled
> >   hw/i386/fw_cfg: Set SGX bits in feature control fw_cfg accordingly
> >   hw/i386/pc: Account for SGX EPC sections when calculating device
> >     memory
> >   i386/pc: Add e820 entry for SGX EPC section(s)
> >   i386: acpi: Add SGX EPC entry to ACPI tables
> >   q35: Add support for SGX EPC
> >   i440fx: Add support for SGX EPC
> >   doc: Add the SGX doc
> >
> >Yang Zhong (12):
> >   qom: Add memory-backend-epc ObjectOptions support
> >   hostmem-epc: Add the reset interface for EPC backend reset
> >   sgx-epc: Add the reset interface for sgx-epc virt device
> >   sgx-epc: Avoid bios reset during sgx epc initialization
> >   hostmem-epc: Make prealloc consistent with qemu cmdline during reset
> >   qmp: Add query-sgx command
> >   hmp: Add 'info sgx' command
> >   i386: Add sgx_get_info() interface
> >   bitops: Support 32 and 64 bit mask macro
> >   qmp: Add the qmp_query_sgx_capabilities()
> >   Kconfig: Add CONFIG_SGX support
> >   sgx-epc: Add the fill_device_info() callback support
> >
> >  backends/hostmem-epc.c                   | 118 ++++++++++
> >  backends/meson.build                     |   1 +
> >  configs/devices/i386-softmmu/default.mak |   1 +
> >  docs/intel-sgx.txt                       | 167 ++++++++++++++
> >  hmp-commands-info.hx                     |  15 ++
> >  hw/i386/Kconfig                          |   5 +
> >  hw/i386/acpi-build.c                     |  22 ++
> >  hw/i386/fw_cfg.c                         |  10 +-
> >  hw/i386/meson.build                      |   2 +
> >  hw/i386/pc.c                             |  15 +-
> >  hw/i386/pc_piix.c                        |   4 +
> >  hw/i386/pc_q35.c                         |   3 +
> >  hw/i386/sgx-epc.c                        | 265 +++++++++++++++++++++++
> >  hw/i386/sgx-stub.c                       |  13 ++
> >  hw/i386/sgx.c                            | 170 +++++++++++++++
> >  hw/i386/x86.c                            |  29 +++
> >  hw/vfio/common.c                         |   1 +
> >  include/exec/memory.h                    |  15 +-
> >  include/hw/i386/pc.h                     |  10 +
> >  include/hw/i386/sgx-epc.h                |  68 ++++++
> >  include/hw/i386/x86.h                    |   1 +
> >  include/monitor/hmp.h                    |   1 +
> >  include/qemu/bitops.h                    |   7 +
> >  monitor/hmp-cmds.c                       |  32 +++
> >  monitor/qmp-cmds.c                       |  19 ++
> >  qapi/machine.json                        |  52 ++++-
> >  qapi/misc.json                           |  61 ++++++
> >  qapi/qom.json                            |  19 ++
> >  qemu-options.hx                          |  10 +-
> >  softmmu/memory.c                         |   5 +
> >  softmmu/physmem.c                        |   3 +-
> >  stubs/meson.build                        |   1 +
> >  stubs/sgx-stub.c                         |  12 +
> >  target/i386/cpu.c                        | 168 +++++++++++++-
> >  target/i386/cpu.h                        |  16 ++
> >  target/i386/kvm/kvm.c                    |  75 +++++++
> >  target/i386/kvm/kvm_i386.h               |   2 +
> >  target/i386/machine.c                    |  20 ++
> >  tests/qtest/qmp-cmd-test.c               |   2 +
> >  39 files changed, 1430 insertions(+), 10 deletions(-)
> >  create mode 100644 backends/hostmem-epc.c
> >  create mode 100644 docs/intel-sgx.txt
> >  create mode 100644 hw/i386/sgx-epc.c
> >  create mode 100644 hw/i386/sgx-stub.c
> >  create mode 100644 hw/i386/sgx.c
> >  create mode 100644 include/hw/i386/sgx-epc.h
> >  create mode 100644 stubs/sgx-stub.c
> >
> >



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