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| From: | David Hildenbrand |
| Subject: | Re: [Qemu-devel] [PATCH v5 11/22] s390x: allow only 1 CPU with TCG |
| Date: | Wed, 13 Sep 2017 18:25:10 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 |
On 13.09.2017 18:13, Alex Bennée wrote: > > David Hildenbrand <address@hidden> writes: > >> Specifying more than 1 CPU (e.g. -smp 5) leads to SIGP errors (the >> guest tries to bring these CPUs up but fails), because we don't support >> multiple CPUs on s390x under TCG. >> >> Let's bail out if more than 1 is specified, so we don't raise people's >> hope. > > Why does this restriction exist? Without MTTCG enabled -smp > 1 should > be safe from any races. Because the actual SIGP code (instruction to start/stop ... CPUs) is not implemented yet. -- Thanks, David
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