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| author | Richard Henderson <richard.henderson@linaro.org> | 2025-04-12 09:43:15 -0700 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2025-04-14 12:30:09 +0300 |
| commit | f3ca7ca22271ac7c1b997092d72ad36517618fb5 (patch) | |
| tree | 461786b51536eb6250cd368bf92d7c8cae76d707 | |
| parent | b0b5af62ef9eaf25246cdd433a4eb69361298ee4 (diff) | |
| download | qemu-f3ca7ca22271ac7c1b997092d72ad36517618fb5.zip qemu-f3ca7ca22271ac7c1b997092d72ad36517618fb5.tar.gz qemu-f3ca7ca22271ac7c1b997092d72ad36517618fb5.tar.bz2 | |
docs: Document removal of 64-bit on 32-bit emulation
With acce728cbc6c we disallowed configuring 64-bit guests on
32-bit hosts, but forgot to document that in removed-features.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
| -rw-r--r-- | docs/about/removed-features.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst index 2527a91..790a5e4 100644 --- a/docs/about/removed-features.rst +++ b/docs/about/removed-features.rst @@ -858,6 +858,15 @@ QEMU. Since all recent x86 hardware from the past >10 years is capable of the 64-bit x86 extensions, a corresponding 64-bit OS should be used instead. +32-bit hosts for 64-bit guests (removed in 10.0) +'''''''''''''''''''''''''''''''''''''''''''''''' + +In general, 32-bit hosts cannot support the memory space or atomicity +requirements of 64-bit guests. Prior to 10.0, QEMU attempted to +work around the atomicity issues in system mode by running all vCPUs +in a single thread context; in user mode atomicity was simply broken. +From 10.0, QEMU has disabled configuration of 64-bit guests on 32-bit hosts. + Guest Emulator ISAs ------------------- |