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Re: [Xen-devel] [PATCH v2 08/10] tools/libxc: Rework xc_cpuid_apply_policy() to use {get, set}_cpu_policy()
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 19 Sep 2019 09:48:19 +0100
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxx>
- Delivery-date: Thu, 19 Sep 2019 08:48:33 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 18/09/2019 17:09, Jan Beulich wrote:
> On 13.09.2019 21:27, Andrew Cooper wrote:
>> + else
>> + {
>> + /*
>> + * Topology for HVM guests is entirely controlled by Xen. For now,
>> we
>> + * hardcode APIC_ID = vcpu_id * 2 to give the illusion of no SMT.
>> + */
>> + p->basic.htt = true;
>> + p->extd.cmp_legacy = false;
>> +
>> + p->basic.lppp *= 2;
> So as I've just learned from investigating the multi-vCPU guest boot
> issue on Rome, this ...
>
>> + switch ( p->x86_vendor )
>> + {
>> + case X86_VENDOR_INTEL:
>> + for ( i = 0; (p->cache.subleaf[i].type &&
>> + i < ARRAY_SIZE(p->cache.raw)); ++i )
>> + {
>> + p->cache.subleaf[i].cores_per_package =
>> + (p->cache.subleaf[i].cores_per_package << 1) | 1;
> ..., this, and ...
>
>> + p->cache.subleaf[i].threads_per_cache = 0;
>> + }
>> + break;
>> +
>> + case X86_VENDOR_AMD:
>> + case X86_VENDOR_HYGON:
>> + p->extd.nc = (p->extd.nc << 1) | 1;
> ... this can overflow (in the first case in particular leading to
> a value of zero when the initial value was 128). I think it
> wouldn't be bad if all of these were made saturating operations
> in this new code, despite this not being an exact equivalent of
> the old code. I haven't tried out yet whether correcting this in
> the old code (thus applicable to 4.12 and older) will be enough
> to fix the issue, but it is certainly part of what's needed.
Given that we obviously want to backport, and I'm still waiting on acks,
it might be best for me to rebase this patch over whatever changes are
necessary to fix Rome.
~Andrew
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