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Re: [Xen-devel] [PATCH v2] x86/HVM: relinquish resources also from hvm_domain_destroy()
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 29 Jan 2020 16:40:31 +0000
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- Cc: Paul Durrant <paul@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 29 Jan 2020 16:40:46 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 29/01/2020 12:59, Jan Beulich wrote:
> Domain creation failure paths don't call domain_relinquish_resources(),
> yet allocations and alike done from hvm_domain_initialize() need to be
> undone nevertheless. Call the function also from hvm_domain_destroy(),
> after making sure all descendants are idempotent.
>
> Note that while viridian_{domain,vcpu}_deinit() were already used in
> ways suggesting they're idempotent, viridian_time_vcpu_deinit() actually
> wasn't: One can't kill a timer that was never initialized.
>
> For hvm_destroy_all_ioreq_servers()'s purposes make
> relocate_portio_handler() return whether the to be relocated port range
> was actually found. This seems cheaper than introducing a flag into
> struct hvm_domain's ioreq_server sub-structure.
>
> In hvm_domain_initialise() additionally
> - use XFREE() also to replace adjacent xfree(),
> - use hvm_domain_relinquish_resources() as being idempotent now.
> There as well as in hvm_domain_destroy() the explicit call to
> rtc_deinit() isn't needed anymore.
>
> In hvm_domain_relinquish_resources() additionally drop a no longer
> relevant if().
>
> Fixes: e7a9b5e72f26 ("viridian: separately allocate domain and vcpu
> structures")
> Fixes: 26fba3c85571 ("viridian: add implementation of synthetic timers")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Any idempotency improvements in the destroy paths are a good thing.
We'll be wanting this work complete for the stable toolstack hypercall
work, so we don't have to include a logically broken call into the brand
new API.
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