[PATCH v3 00/10] target/i386: Fix Hygon vendor-specific CPU behavior

Hygon Dhyana uses the HygonGenuine vendor string, but a number of
guest-visible and KVM-facing interfaces follow AMD-compatible behavior.
QEMU currently keys several of these paths only on AuthenticAMD, so Hygon
guests can see vendor-inconsistent CPUID/MSR state or use the wrong KVM
PMU/MCE handling paths.

This series makes those checks explicit for Hygon where appropriate.

Guest-visible CPU ABI changes are gated by the new
x-hygon-vendor-abi-fixes property.  The property defaults to true for new
machine types and is disabled for pc-11.1 and older, so existing machine
types keep their previous Hygon ABI for migration compatibility.

The KVM injected-MCE and PMU path changes are not CPUID model table
changes.  They make QEMU use the AMD-compatible runtime handling that
Linux/KVM already uses for Hygon.

The series covers:

  * AMD CPUID[0x80000001].EDX aliases for Hygon
  * hiding Intel cache CPUID leaves 2 and 4 for Hygon
  * hiding IA32_ARCH_CAPABILITIES for Hygon unless old ABI requires it
  * AMD MCE status encoding for Hygon memory-failure injection
  * AMD PMU MSR setup/save/restore paths for Hygon
  * disabling Intel-style MCA broadcast for Hygon injected MCEs
  * AMD IOMMU HT GPA hole layout for Hygon on new machine types
  * AMD legacy cache fallback for Hygon when legacy-cache=on
  * AMD-shaped default ucode-rev value for Hygon

Changes in v3:

  * Rebased onto QEMU master at v11.1.0-453-geea8fe61b8.  Use the
    pc_compat_11_1 infrastructure already present upstream and remove the
    duplicate compatibility wiring from the i440fx and q35 11.0 machine
    options.  Preserve the old Hygon ABI through pc-11.1 and update the
    affected commit messages accordingly.  (Zhao)
  * Split the PMU change into a no-functional-change vendor-family
    refactoring patch followed by the Hygon-specific change.  (Zhao)
  * Fold enforce_amd_1tb_hole and x-hygon-vendor-abi-fixes into the IOMMU
    HT GPA hole helper and update its comment.  Use explicit pc-q35-11.2
    and pc-q35-11.1 machine versions in the functional tests and include
    those versions in the test names.  (Zhao)
  * Remove the redundant vendor-specific comment from the ucode-rev
    default path.  (Zhao)
  * Update the hygon_vendor_abi_fixes field comment to follow the style of
    other machine-type compatibility fields.
  * Add Reviewed-by tags from Zhao Liu to the Hygon MCE status, MCE
    broadcast, and ucode-rev patches.

Changes in v2:

  * Rebased onto v11.1.0-rc3.  Moved the compatibility property to
    pc_compat_11_1 and wired it into the i440fx and q35 11.1 machine
    options.  (Zhao)
  * Patch 1: removed the single-use CPUID-alias helper and checked Hygon
    directly at the call site.  Also updated the hygon_vendor_abi_fixes
    field comment to emphasize that it is a machine-type compatibility
    option.  (Zhao)
  * Patch 4: removed the single-use MCE-status helper and checked Hygon
    directly at the call site.  (Zhao)
  * Patch 5: reworked the PMU vendor checks around a common PMU vendor-family
    abstraction, covering host/guest compatibility, PMU initialization,
    and PMU MSR save/restore.  (Zhao)
  * Collected Reviewed-by tags for patches 2, 3, and 8.

Tested with:

  ninja -C build

  build/pyvenv/bin/meson test -C build --print-errorlogs \
      qemu:qtest-x86_64/test-x86-cpuid-compat \
      qemu:func-x86_64-mem_addr_space

Tina Zhang (10):
  target/i386: Sync AMD CPUID aliases for Hygon
  target/i386: Hide Intel cache CPUID leaves for Hygon
  target/i386: Hide ARCH_CAPABILITIES for Hygon
  target/i386/kvm: Use AMD MCE status encoding for Hygon
  target/i386/kvm: Classify PMU vendor families
  target/i386/kvm: Use AMD PMU MSR paths for Hygon
  target/i386: Do not broadcast injected MCEs for Hygon
  hw/i386: Reserve AMD IOMMU HT GPA range for Hygon
  target/i386: Use AMD legacy cache fallback for Hygon
  target/i386: Use AMD ucode-rev default for Hygon

 hw/i386/pc.c                                  | 30 ++++--
 target/i386/cpu.c                             | 68 +++++++++----
 target/i386/cpu.h                             | 12 +++
 target/i386/helper.c                          |  2 +-
 target/i386/kvm/kvm.c                         | 75 +++++++++++----
 .../functional/x86_64/test_mem_addr_space.py  | 36 +++++++
 tests/qtest/test-x86-cpuid-compat.c           | 95 +++++++++++++++++++
 7 files changed, 275 insertions(+), 43 deletions(-)

-- 
2.43.7