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Re: [PATCH 3/6] x86: Define some Intel vPMU leafs
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 24 Mar 2026 10:22:54 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 24 Mar 2026 09:23:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.03.2026 17:44, Teddy Astie wrote:
> --- a/xen/include/xen/lib/x86/cpu-policy.h
> +++ b/xen/include/xen/lib/x86/cpu-policy.h
> @@ -162,7 +162,15 @@ struct cpu_policy
> uint64_t :64, :64; /* Leaf 0x9 - DCA */
>
> /* Leaf 0xa - Intel PMU. */
> - uint8_t pmu_version, _pmu[15];
> + struct {
> + uint8_t /* a */ version, num_gp_ctrs, gp_ctr_width,
> + event_enum_length;
> + uint32_t /* b */:32;
> + uint32_t /* c */ fixed_ctr_mask;
> + uint32_t /* d */ num_fixed_ctr:5, fixed_ctr_width:8, :1,
> + anythread_depreciation:1, slots_per_cyc:4,
> + :13;
> + } pmu;
Style-wise this looks to follow e.g. the cache leaf, so perhaps okay, even
if I would have preferred you to follow what we did for leaf 6. The named
boolean field, however, wants to be of type bool. And then the unnamed 1-bit
field really wants to be 2 bits, for anythread_depreciation to be bit 15
(etc).
Jan
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