* On versioned CPU models, aliases, and machine types
@ 2021-10-15 10:52 Kashyap Chamarthy
0 siblings, 0 replies; only message in thread
From: Kashyap Chamarthy @ 2021-10-15 10:52 UTC (permalink / raw)
To: qemu-devel; +Cc: berrange, ehabkost
Hi
With the versioned CPU models, I see that the plain, non-versioned named
model now says: "alias configured by machine type". For example:
$> qemu-system-x86_64 -cpu help | grep Broadwell
x86 Broadwell (alias configured by machine type)
x86 Broadwell-IBRS (alias of Broadwell-v3)
x86 Broadwell-noTSX (alias of Broadwell-v2)
x86 Broadwell-noTSX-IBRS (alias of Broadwell-v4)
x86 Broadwell-v1 Intel Core Processor (Broadwell)
x86 Broadwell-v2 Intel Core Processor (Broadwell, no TSX)
x86 Broadwell-v3 Intel Core Processor (Broadwell, IBRS)
x86 Broadwell-v4 Intel Core Processor (Broadwell, no TSX, IBRS)
Now, any QEMU binary (qemu-system-x86-6.0.0-1 in my case) supports a ton
of versioned machine types. So when the plain "Broadwell" model says
"alias configured by machine type", I have two questions:
(1) Is there a way to figure out _which_ exact versioned CPU model will
plain "Broadwell" alias to in the above case?
My guess: Assuming I'm using the plain 'q35' machine type (which
aliases to the latest versioned machine type), "Broadwell" will
alias to "Broadwell-v4".
(2) Also, it sounds like depending on the versioned machine type I
configure, the CPU model alias of plain "Broadwell" might change --
is this correct?
(Ideally, I'd like to document an example of each of the above in the
in-tree doc, cpu-models-x86.rst.inc. It's not really obvious.)
--
/kashyap
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2021-10-15 10:53 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-10-15 10:52 On versioned CPU models, aliases, and machine types Kashyap Chamarthy
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).