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Date: Mon, 30 Dec 2024 16:28:30 +0000
From: Alexandru Elisei <alexandru.elisei@arm.com>
To: Andrew Jones <andrew.jones@linux.dev>
Cc: Vladimir Murzin <vladimir.murzin@arm.com>, kvmarm@lists.linux.dev,
	nikos.nikoleris@arm.com, eric.auger@redhat.com
Subject: Re: [kvm-unit-tests PATCH v2] arm64: Add basic MTE test
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References: <20241212103447.34593-1-vladimir.murzin@arm.com>
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 <0fc53bdf-f919-40b9-8530-d11593ec55f7@arm.com>
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In-Reply-To: <20241230-3c7d660ca38c9b390ec74b01@orel>

Hi Drew,

On Mon, Dec 30, 2024 at 04:45:01PM +0100, Andrew Jones wrote:
> On Mon, Dec 30, 2024 at 03:19:48PM +0000, Alexandru Elisei wrote:
> ...
> > Interestingly though, when I try to run a test (either with ./run_tests.sh
> > mte-sync, or by trying out your example), I get this error:
> > 
> > qemu-system-aarch64: MTE requested, but not supported by the guest CPU
> > 
> > My guess is that's caused by kvm-unit-tests defaulting to cortex-a57 as the
> > model CPU. Changing the cpu to 'max' makes the test run. How are you getting
> > around this on your end?
> >
> 
> We can (and I think should) change to 'max' for the default model.

I think so too, something like this maybe?

diff --git a/configure b/configure
index 86cf1da36467..4babbd5f5e74 100755
--- a/configure
+++ b/configure
@@ -286,7 +286,7 @@ fi
 [ -z "$processor" ] && processor="$arch"

 if [ "$processor" = "arm64" ]; then
-    processor="cortex-a57"
+    processor="max"
 elif [ "$processor" = "arm" ]; then
     processor="cortex-a15"
 fi

Can't do the same for arm, because Makefile.arm passes the processor to
-mcpu and that causes a build error.


Thanks,
Alex