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docs: Document removal of 64-bit on 32-bit emulation

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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>
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Richard Henderson 2025-04-12 09:43:15 -07:00 committed by Michael Tokarev
parent b0b5af62ef
commit f3ca7ca222
1 changed files with 9 additions and 0 deletions
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docs/about/removed-features.rst
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@ -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
-------------------