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Wed, 01 Apr 2026 05:29:06 -0700 (PDT) Message-ID: <4a4c011e-9666-4416-be1b-33d1dcad5afe@suse.com> Date: Wed, 1 Apr 2026 14:29:05 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Jan Beulich Subject: [PATCH v3] arinc653: don't assume Dom0 is the control domain To: "xen-devel@lists.xenproject.org" Cc: Nathan Studer , Stewart Hildebrand , Juergen Gross References: <89d17a24-0a1f-4f3f-ac2f-f3701a8d78dd@suse.com> Content-Language: en-US Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <89d17a24-0a1f-4f3f-ac2f-f3701a8d78dd@suse.com> Content-Transfer-Encoding: quoted-printable X-purgate-ID: tlsNG-4011c0/1775046547-0FB450B1-69CB6168/0/0 X-purgate-type: clean X-purgate-size: 1116 X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1775046567972154100 Content-Type: text/plain; charset="utf-8" Leaving aside highly disaggregated environments, the control domain is what will invoke XEN_SYSCTL_SCHEDOP_putinfo. Its vCPU-s therefore need to be able to run unconditionally, not those of the domain with ID 0 (which may not exist at all). Fixes: 9f0c658baedc ("arinc: add cpu-pool support to scheduler") Signed-off-by: Jan Beulich Reviewed-by: Juergen Gross --- There being no "else" to the if(), what about other control domain vCPU-s? --- v3: Don't mistakenly include the idle domain. v2: New. --- a/xen/common/sched/arinc653.c +++ b/xen/common/sched/arinc653.c @@ -411,10 +411,10 @@ a653sched_alloc_udata(const struct sched spin_lock_irqsave(&sched_priv->lock, flags); =20 /* - * Add every one of dom0's units to the schedule, as long as there are - * slots available. + * Add every one of the control domain's units to the schedule, as lon= g as + * there are slots available. */ - if ( unit->domain->domain_id =3D=3D 0 ) + if ( is_control_domain(unit->domain) && !is_idle_domain(unit->domain) ) { entry =3D sched_priv->num_schedule_entries;