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i386: Resolve CPU models to v1 by default 

When using `query-cpu-definitions` using `-machine none`,
QEMU is resolving all CPU models to their latest versions.  The
actual CPU model version being used by another machine type (e.g.
`pc-q35-4.0`) might be different.

In theory, this was OK because the correct CPU model
version is returned when using the correct `-machine` argument.

Except that in practice, this breaks libvirt expectations:
libvirt always use `-machine none` when checking if a CPU model
is runnable, because runnability is not expected to be affected
when the machine type is changed.

For example, when running on a Haswell host without TSX,
Haswell-v4 is runnable, but Haswell-v1 is not.  On those hosts,
`query-cpu-definitions` says Haswell is runnable if using
`-machine none`, but Haswell is actually not runnable using any
of the `pc-*` machine types (because they resolve Haswell to
Haswell-v1).  In other words, we're breaking the "runnability
guarantee" we promised to not break for a few releases (see
qemu-deprecated.texi).

To address this issue, change the default CPU model version to v1
on all machine types, so we make `query-cpu-definitions` output
when using `-machine none` match the results when using `pc-*`.
This will change in the future (the plan is to always return the
latest CPU model version if using `-machine none`), but only
after giving libvirt the opportunity to adapt.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1779078
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20191205223339.764534-1-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
master
Eduardo Habkost 2019-12-05 19:33:39 -03:00
parent aceeaa69d2
commit ad18392892
2 changed files with 15 additions and 1 deletions
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8
qemu-deprecated.texi
View File

@ -367,6 +367,14 @@ guarantees must resolve the CPU model aliases using te
``alias-of'' field returned by the ``query-cpu-definitions'' QMP
command.
While those guarantees are kept, the return value of
``query-cpu-definitions'' will have existing CPU model aliases
point to a version that doesn't break runnability guarantees
(specifically, version 1 of those CPU models). In future QEMU
versions, aliases will point to newer CPU model versions
depending on the machine type, so management software must
resolve CPU model aliases before starting a virtual machine.
@node Recently removed features
@appendix Recently removed features

8
target/i386/cpu.c
View File

@ -3981,7 +3981,13 @@ static PropValue tcg_default_props[] = {
};
X86CPUVersion default_cpu_version = CPU_VERSION_LATEST;
/*
* We resolve CPU model aliases using -v1 when using "-machine
* none", but this is just for compatibility while libvirt isn't
* adapted to resolve CPU model versions before creating VMs.
* See "Runnability guarantee of CPU models" at * qemu-deprecated.texi.
*/
X86CPUVersion default_cpu_version = 1;
void x86_cpu_set_default_version(X86CPUVersion version)
{