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| author | Paolo Bonzini <pbonzini@redhat.com> | 2024-05-08 17:44:12 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-05-10 15:45:14 +0200 |
| commit | 9f07e47a5e96c88c1d2892fbdcbc8ff0437b7ac3 (patch) | |
| tree | 4c11a2bb3d5ada39e5b92202c8e40eb5fb1302a4 /docs/about | |
| parent | dafec285bdbfe415ac6823abdc510e0b92c3f094 (diff) | |
target/i386: remove PCOMMIT from TCG, deprecate property
The PCOMMIT instruction was never included in any physical processor.
TCG implements it as a no-op instruction, but its utility is debatable
to say the least. Drop it from the decoder since it is only available
with "-cpu max", which does not guarantee migration compatibility
across versions, and deprecate the property just in case someone is
using it as "pcommit=off".
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'docs/about')
| -rw-r--r-- | docs/about/deprecated.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index 5c3ca47801..40585ca7d5 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -432,6 +432,14 @@ Backend ``memory`` (since 9.0) CPU device properties ''''''''''''''''''''' +``pcommit`` on x86 (since 9.1) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The PCOMMIT instruction was never included in any physical processor. +It was implemented as a no-op instruction in TCG up to QEMU 9.0, but +only with ``-cpu max`` (which does not guarantee migration compatibility +across versions). + ``pmu-num=n`` on RISC-V CPUs (since 8.2) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |