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Re: [RFC PATCH v3 20/28] target/arm: Set cortex-a57 as default cpu for K


From: Richard Henderson
Subject: Re: [RFC PATCH v3 20/28] target/arm: Set cortex-a57 as default cpu for KVM-only build
Date: Fri, 13 Jan 2023 12:06:06 -1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2

On 1/13/23 08:22, Fabiano Rosas wrote:
Claudio Fontana <cfontana@suse.de> writes:

On 1/13/23 15:04, Fabiano Rosas wrote:
The cortex-a15 is not present anymore when CONFIG_TCG=n, so use the
cortex-a57 as default cpu for KVM.

Signed-off-by: Fabiano Rosas <farosas@suse.de>

Our recommendation currently for KVM on ARM is to always use CPU="host", as 
named cpu models generally don't work (yet?) with KVM.

https://qemu-project.gitlab.io/qemu/system/arm/cpu-features.html

Should then "host" be the default for KVM if CONFIG_TCG=N or CONFIG_TCG=M and 
the TCG .so is not loaded?

Yes, "host" seems to make more sense. I was under the impression that
there was a way to use cortex-a57 and cortex-a53 since they have
cpu->kvm_target set.

One may use a -cpu other than 'host' if and only if it exactly matches the host.

r~




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