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Re: [Xen-devel] [PATCH 3/8] x86/domctl: Implement XEN_DOMCTL_set_cpumsr_policy
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 12 Sep 2019 17:34:14 +0100
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- Cc: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 12 Sep 2019 16:34:24 +0000
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On 12/09/2019 14:15, Andrew Cooper wrote:
> On 12/09/2019 09:06, Jan Beulich wrote:
>> On 11.09.2019 22:04, Andrew Cooper wrote:
>>> --- a/tools/libxc/xc_cpuid_x86.c
>>> +++ b/tools/libxc/xc_cpuid_x86.c
>>> @@ -229,6 +229,55 @@ int xc_get_domain_cpu_policy(xc_interface *xch,
>>> uint32_t domid,
>>> return ret;
>>> }
>>>
>>> +int xc_set_domain_cpu_policy(xc_interface *xch, uint32_t domid,
>>> + uint32_t nr_leaves, xen_cpuid_leaf_t *leaves,
>>> + uint32_t nr_msrs, xen_msr_entry_t *msrs,
>>> + uint32_t *err_leaf_p, uint32_t *err_subleaf_p,
>>> + uint32_t *err_msr_idx_p)
>>> +{
>>> + DECLARE_DOMCTL;
>>> + DECLARE_HYPERCALL_BOUNCE(leaves,
>>> + nr_leaves * sizeof(*leaves),
>>> + XC_HYPERCALL_BUFFER_BOUNCE_IN);
>>> + DECLARE_HYPERCALL_BOUNCE(msrs,
>>> + nr_msrs * sizeof(*msrs),
>>> + XC_HYPERCALL_BUFFER_BOUNCE_IN);
>> With both being IN, the respective function parameters should imo
>> be pointers to const.
> Ok.
Sadly not. It turns out that this is incompatible with the internals of
DECLARE_HYPERCALL_BOUNCE().
~Andrew
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