Re: [PATCH v4 00/17] Introduce support for IGVM files

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Jul 03, 2024 at 12:05:38PM +0100, Roy Hopkins wrote:
> Here is v4 of the set of patches to add support for IGVM files to QEMU. This is
> based on commit 1a2d52c7fc of qemu.
> 
> This version addresses all of the review comments from v3 along with a couple of
> small bug fixes. This is a much smaller increment than in the previous version
> of the series [1]. Thanks once again to the reviewers that have been looking at
> this series. This v4 patch series is also available on github: [2]
> 
> The previous version had a build issue when building without debug enabled.
> Patch 8/17 has been added to fix this and I've updated my own process to test
> both debug and release builds of QEMU.
> 
> For testing IGVM support in QEMU you need to generate an IGVM file that is
> configured for the platform you want to launch. You can use the `buildigvm`
> test tool [3] to allow generation of IGVM files for all currently supported
> platforms. Patch 11/17 contains information on how to generate an IGVM file
> using this tool.

PC things:

Acked-by: Michael S. Tsirkin <mst@redhat.com>


> Changes in v4:
> 
> * Remove unused '#ifdef CONFIG_IGVM' sections
> * Add "'if': 'CONFIG_IGVM'" for IgvmCfgProperties in qom.json
> * Use error_fatal instead of error_abort in suggested locations
> * Prevent addition of bios code when an IGVM file is provided and pci_enabled is false
> * Add patch 6/17 to fix error handling from sev_encrypt_flash()
> * Revert unrequired changes to return values in sev/*_launch_update() functions
> * Add documentation to igvm.rst to describe how to use 'buildigvm'
> * Various convention and code style changes as suggested in reviews
> * Fix handling of sev_features for kernels that do not support KVM_SEV_INIT2
> * Move igvm-cfg from MachineState to X86MachineState
> 
> Patch summary:
> 
> 1-12: Add support and documentation for processing IGVM files for SEV, SEV-ES,
> SEV-SNP and native platforms. 
> 
> 13-16: Processing of policy and SEV-SNP ID_BLOCK from IGVM file. 
> 
> 17: Add pre-processing of IGVM file to support synchronization of 'SEV_FEATURES'
> from IGVM VMSA to KVM.
> 
> [1] Link to v3:
> https://lore.kernel.org/qemu-devel/cover.1718979106.git.roy.hopkins@suse.com/
> 
> [2] v4 patches also available here:
> https://github.com/roy-hopkins/qemu/tree/igvm_master_v4
> 
> [3] `buildigvm` tool v0.2.0
> https://github.com/roy-hopkins/buildigvm/releases/tag/v0.2.0
> 
> Roy Hopkins (17):
>   meson: Add optional dependency on IGVM library
>   backends/confidential-guest-support: Add functions to support IGVM
>   backends/igvm: Add IGVM loader and configuration
>   hw/i386: Add igvm-cfg object and processing for IGVM files
>   i386/pc_sysfw: Ensure sysfw flash configuration does not conflict with
>     IGVM
>   sev: Fix error handling in sev_encrypt_flash()
>   sev: Update launch_update_data functions to use Error handling
>   target/i386: Allow setting of R_LDTR and R_TR with
>     cpu_x86_load_seg_cache()
>   i386/sev: Refactor setting of reset vector and initial CPU state
>   i386/sev: Implement ConfidentialGuestSupport functions for SEV
>   docs/system: Add documentation on support for IGVM
>   docs/interop/firmware.json: Add igvm to FirmwareDevice
>   backends/confidential-guest-support: Add set_guest_policy() function
>   backends/igvm: Process initialization sections in IGVM file
>   backends/igvm: Handle policy for SEV guests
>   i386/sev: Add implementation of CGS set_guest_policy()
>   sev: Provide sev_features flags from IGVM VMSA to KVM_SEV_INIT2
> 
>  docs/interop/firmware.json                 |   9 +-
>  docs/system/i386/amd-memory-encryption.rst |   2 +
>  docs/system/igvm.rst                       | 173 ++++
>  docs/system/index.rst                      |   1 +
>  meson.build                                |   8 +
>  qapi/qom.json                              |  17 +
>  backends/igvm.h                            |  23 +
>  include/exec/confidential-guest-support.h  |  96 +++
>  include/hw/i386/x86.h                      |   3 +
>  include/sysemu/igvm-cfg.h                  |  54 ++
>  target/i386/cpu.h                          |   9 +-
>  target/i386/sev.h                          | 124 +++
>  backends/confidential-guest-support.c      |  43 +
>  backends/igvm-cfg.c                        |  66 ++
>  backends/igvm.c                            | 958 +++++++++++++++++++++
>  hw/i386/pc.c                               |  12 +
>  hw/i386/pc_piix.c                          |  10 +
>  hw/i386/pc_q35.c                           |  10 +
>  hw/i386/pc_sysfw.c                         |  31 +-
>  target/i386/sev.c                          | 844 ++++++++++++++++--
>  backends/meson.build                       |   5 +
>  meson_options.txt                          |   2 +
>  qemu-options.hx                            |  25 +
>  scripts/meson-buildoptions.sh              |   3 +
>  24 files changed, 2447 insertions(+), 81 deletions(-)
>  create mode 100644 docs/system/igvm.rst
>  create mode 100644 backends/igvm.h
>  create mode 100644 include/sysemu/igvm-cfg.h
>  create mode 100644 backends/igvm-cfg.c
>  create mode 100644 backends/igvm.c
> 
> -- 
> 2.43.0