Re: [PATCH 1/2] docs/about: Deprecate 32-bit x86 hosts and qemu-system-i386

On 27/2/23 21:12, Michael S. Tsirkin wrote: > On Mon, Feb 27, 2023 at 11:50:07AM +0000, Daniel P. Berrangé wrote: >> I feel like we should have separate deprecation entries for the >> i686 host support, and for qemu-system-i386 emulator binary, as >> although they're related they are independant features with >> differing impact. eg removing qemu-system-i386 affects all >> host architectures, not merely 32-bit x86 host, so I think we >> can explain the impact more clearly if we separate them. > > Removing qemu-system-i386 seems ok to me - I think qemu-system-x86_64 is > a superset. Doesn't qemu-system-i386 start the CPU in a different mode that qemu-system-x86_64? Last time we discussed it, we mention adding -32 and -64 CLI flags to maintain compat, and IIRC this flag would add boot code to switch the CPU in 32-b. But then maybe I misunderstood. Thomas said, "CPUs must start in the same mode they start in HW".