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Re: [PATCH 09/17] xev/hvm: Add HVMOP_get|set_ecam_space hypercalls
- To: Thierry Escande <thierry.escande@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 12 Jun 2026 13:49:41 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 12 Jun 2026 11:49:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.06.2026 12:01, Thierry Escande wrote:
> On 5/4/26 17:12, Jan Beulich wrote:
>> On 13.03.2026 17:35, Thierry Escande wrote:
>>> --- a/xen/include/public/hvm/hvm_op.h
>>> +++ b/xen/include/public/hvm/hvm_op.h
>>> @@ -166,6 +166,17 @@ struct xen_hvm_get_mem_type {
>>> typedef struct xen_hvm_get_mem_type xen_hvm_get_mem_type_t;
>>> DEFINE_XEN_GUEST_HANDLE(xen_hvm_get_mem_type_t);
>>>
>>> +#define HVMOP_set_ecam_space 16
>>> +#define HVMOP_get_ecam_space 17
>>> +struct xen_hvm_ecam_space {
>>> + domid_t domid;
>>> + uint16_t pad[3]; /* align next field on 8-byte boundary */
>>
>> The comment, as is, is wrong for 32-bit HVM guests: There ...
>>
>>> + uint64_t addr;
>>
>> ... this is only 4-byte aligned, and hence the entire structure only
>> has 4-byte alignment, and hence the padding also only guarantees 4-
>> byte alignment.
>
> Right. Roger proposal fixes it:
> domid_t domid;
> uint16_t pad;
> uint32_t size
> uint64_t addr;
By not having the bogus comment, yes. It doesn't fix the alignment aspect,
yet that may also not be important here in the end.
Jan
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