Re: [PATCH v2 1/4] qemu: Fix migration with custom XML

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On Wed, Apr 17, 2024 at 14:36:08 +0200, Jiri Denemark wrote:
> Ages ago origCPU in domain private data was introduced to provide
> backward compatibility when migrating to an old libvirt, which did not
> support fetching updated CPU definition from QEMU. Thus origCPU will
> contain the original CPU definition before such update. But only if the
> update actually changed anything. Let's always fill origCPU with the
> original definition when starting a domain so that we can rely on it
> being always set, even if it matches the updated definition.
> 
> This fixes migration or save operations with custom domain XML after
> commit v10.1.0-88-g14d3517410, which expected origCPU to be always set
> to the CPU definition from inactive XML to check features explicitly
> requested by a user.
> 
> https://issues.redhat.com/browse/RHEL-30622
> 
> Signed-off-by: Jiri Denemark <jdenemar@xxxxxxxxxx>
> Tested-by: Han Han <hhan@xxxxxxxxxx>
> ---

[...]

> @@ -9147,6 +9137,11 @@ qemuProcessReconnect(void *opaque)
>  
>      qemuDomainVcpuPersistOrder(obj->def);
>  
> +    /* Make sure priv->origCPU is always set. */

Comment is misleading because there are situations when it still will be
NULL.

> +    if (!priv->origCPU &&
> +        qemuDomainUpdateCPU(obj, NULL, &priv->origCPU) < 0)
> +        goto error;
> +
>      if (qemuProcessRefreshCPU(driver, obj) < 0)
>          goto error;

With the comment fixed:

Reviewed-by: Peter Krempa <pkrempa@xxxxxxxxxx>
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