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Re: [Xen-devel] [PATCH 2/5] x86/hvm: Switch hvm_allow_set_param() to use a whitelist
- To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 6 Sep 2018 16:27:05 +0100
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- Cc: Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 06 Sep 2018 15:27:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 06/09/18 10:08, Paul Durrant wrote:
>> -----Original Message-----
>> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
>> Sent: 05 September 2018 19:12
>> To: Xen-devel <xen-devel@xxxxxxxxxxxxx>
>> Cc: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>; Jan Beulich
>> <JBeulich@xxxxxxxx>; Wei Liu <wei.liu2@xxxxxxxxxx>; Roger Pau Monne
>> <roger.pau@xxxxxxxxxx>; Paul Durrant <Paul.Durrant@xxxxxxxxxx>; Stefano
>> Stabellini <sstabellini@xxxxxxxxxx>; Julien Grall <julien.grall@xxxxxxx>
>> Subject: [PATCH 2/5] x86/hvm: Switch hvm_allow_set_param() to use a
>> whitelist
>>
>> There are holes in the HVM_PARAM space, some of which are from
>> deprecated
>> parameters, but toolstack and device models currently has (almost) blanket
> s/has/have
>
>> write access.
>>
>> Rearrange hvm_allow_get_param() to have a whitelist of toolstack-writeable
> s/get/set
Both fixed.
>> d = rcu_lock_domain_by_any_id(a.domid);
>> if ( d == NULL )
>> return -ESRCH;
>> @@ -4209,15 +4228,7 @@ static int hvmop_set_param(
>> case HVM_PARAM_ACPI_IOPORTS_LOCATION:
>> rc = pmtimer_change_ioport(d, a.value);
>> break;
>> - case HVM_PARAM_MEMORY_EVENT_CR0:
>> - case HVM_PARAM_MEMORY_EVENT_CR3:
>> - case HVM_PARAM_MEMORY_EVENT_CR4:
>> - case HVM_PARAM_MEMORY_EVENT_INT3:
>> - case HVM_PARAM_MEMORY_EVENT_SINGLE_STEP:
>> - case HVM_PARAM_MEMORY_EVENT_MSR:
>> - /* Deprecated */
>> - rc = -EOPNOTSUPP;
>> - break;
> Does anything rely on this EOPNOTSUPP vs the EINVAL that would be returned
> after this patch is applied?
Nothing I can spot, although in searching, I see that
xc_hvm_param_deprecated_check() is a thing.
~Andrew
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