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.hender...@linaro.org> --- docs/about/removed-features.rst | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst index 2527a91795..790a5e481c 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 ------------------- -- 2.43.0
