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Re: [Xen-devel] [PATCH 03/10 v2] xen/arm: vpl011: Enable pl011 emulation for a guest domain in Xen

On 02/05/17 16:23, Julien Grall wrote:
Hi Bhupinder,

On 02/05/17 16:20, Bhupinder Thakur wrote:
Hi Jan,

@@ -631,6 +632,9 @@ int arch_domain_create(struct domain *d,
unsigned int domcr_flags,
     if ( (rc = domain_vtimer_init(d, config)) != 0 )
         goto fail;

+    if ( domcr_flags & DOMCRF_vuart )
+        if ( (rc = domain_vpl011_init(d, config)) != 0 )
+            goto fail;

I am planning to remove the usage of domain creation flag to check
whether vuart is enabled/disabled. Please see my next comment. With
that change, domain_vpl011_init() will be called always. The
domain_vpl011_init() will check whether vuart is enabled or disabled
in the config structure passed. If vuart is enabled then it will go
ahead with vpl011 initialization else it will return without
initializing vpl011.

Please don't do that. The arch code decides whether domain_vpl011_init
not the invert.

I was wondering whether it would be better to defer the PL011 creation to a domctl. This could be called after the domain is created with all the information required (MMIO region, Console PFN...).

This would also make the migration support more trivial as the we will not need to know in advance whether a UART is been used.

Any opinions?


Julien Grall

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