[PATCH v2 00/10] Introduce support for IGVM files

[Roy Hopkins <roy.hopkins@suse.com>]

Here is v2 of the set of patches to add support for IGVM files to QEMU. These
address all of the comments on v1 [1]. These patches are also available
to view on github: [2].

Changes in v2:

  * Fixed various spelling and documentation errors from Stefano.
  * Addressed readability and other suggested code changes from Daniel.
  * igvm.c: Fix issue in prepare_memory() which resulted in the wrong start index
     being used at the start of a page range if the next or last directive did
     not follow the previous one.
  * igvmc: Fix usage of IGVM compatibility mask.
  * igvm.c: Fix issue in page_attrs_equal() which treated zero and normal pages
    as equal. This could affect the SEV measurement.
  * Improve and clarify handling of IGVM to VMSA to KVM CPU state conversion.
    The specific registers that are synchronized are now documented and a check
    is performed during IGVM file parsing to determine if any registers outside
    the supported set are non-zero making it easier to determine the cause of
    any mismatch of launch measurement.
  * Significant rework of error handling in ConfidentialGuestSupport and the
    IGVM parser.
  * confidential-guest-support: Remove TDX and other non-currently-supported
    platforms.
  * Exit with error if any unknown IGVM directives are encountered.
  * Rework handling of firmware so if an IGVM file is provided in addition to
    a firmware file then an error is generated.
  * Update firmware.json to add an 'igvm' firmware device.

Thanks to Daniel, Stefano, Ani and everyone else that has taken time to review
this so far.

[1] Link to v1:
https://lore.kernel.org/qemu-devel/cover.1709044754.git.roy.hopkins@suse.com/

[2] v2 patches also available here:
https://github.com/roy-hopkins/qemu/tree/igvm_master_v2

Roy Hopkins (10):
  meson: Add optional dependency on IGVM library
  backends/confidential-guest-support: Add IGVM file parameter
  backends/confidential-guest-support: Add functions to support IGVM
  backends/igvm: Implement parsing and processing of IGVM files
  i386/pc: Process IGVM file during PC initialization if present
  i386/pc_sysfw: Ensure sysfw flash configuration does not conflict with
    IGVM
  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.c      |  75 +++
 backends/igvm.c                            | 744 +++++++++++++++++++++
 backends/meson.build                       |   4 +
 docs/interop/firmware.json                 |   9 +-
 docs/system/i386/amd-memory-encryption.rst |   2 +
 docs/system/igvm.rst                       | 129 ++++
 docs/system/index.rst                      |   1 +
 hw/i386/pc_piix.c                          |   4 +
 hw/i386/pc_q35.c                           |   4 +
 hw/i386/pc_sysfw.c                         |  22 +-
 include/exec/confidential-guest-support.h  | 105 +++
 include/exec/igvm.h                        |  36 +
 meson.build                                |   8 +
 meson_options.txt                          |   2 +
 qapi/qom.json                              |  13 +
 qemu-options.hx                            |   8 +-
 scripts/meson-buildoptions.sh              |   3 +
 target/i386/sev.c                          | 425 +++++++++++-
 target/i386/sev.h                          | 110 +++
 19 files changed, 1671 insertions(+), 33 deletions(-)
 create mode 100644 backends/igvm.c
 create mode 100644 docs/system/igvm.rst
 create mode 100644 include/exec/igvm.h

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2.43.0