[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v1 26/28] docs: add coverage for svm_avic=
- To: dmukhin@xxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 6 Nov 2026 08:03:00 +0100
- Authentication-results: eu.smtp.expurgate.cloud; dkim=pass header.s=google header.d=suse.com header.i="@suse.com" header.h="Content-Transfer-Encoding:Content-Type:In-Reply-To:Autocrypt:From:Content-Language:References:Cc:To:Subject:User-Agent:MIME-Version:Date:Message-ID"
- Autocrypt: addr=jbeulich@xxxxxxxx; 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
- Cc: andrew.cooper3@xxxxxxxxxx, jason.andryuk@xxxxxxx, roger@xxxxxxxxxxxxxx, teddy.astie@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 06 Nov 2026 07:03:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.11.2026 21:22, dmukhin@xxxxxxxx wrote:
> On Thu, Nov 05, 2026 at 09:24:09AM +0100, Jan Beulich wrote:
>> On 05.11.2026 02:33, dmukhin@xxxxxxxx wrote:
>>> @@ -2673,6 +2673,27 @@ On Sappire and Emerald Rapids CPUs with May 2025
>>> microcode or later, the
>>> `ibpb-alt=` option can be used to switch to the alternative mitigation for
>>> Intel SA-00982. Intel suggest that some workloads will benefit from this.
>>>
>>> +### svm_avic (x86)
>>> +> `= true | false | nodoorbell`
>>> +
>>> +This option configures Advanced Virtual Interrupt Controller (AVIC), which
>>> +is an extension of AMD Secure Virtual Machine (SVM) to virtualize local
>>> APIC
>>> +for guest VM.
>>> +
>>> +This parameter is experimental and for expert configuration only.
>>> +
>>> +Xen has mitigatations for the following AVIC hardware flaws:
>>
>> Nit: mitigations
>>
>>> + * AMD Erratum 1235. A hardware flaw affecting certain AMD Family 17h and
>>> + Hygon Family 18h processors where the CPU hardware reads a stale
>>> + `IsRunning=1` bit during Interrupt Control Register (ICR) write
>>> emulation.
>>> +
>>> +Limitations:
>>> +
>>> + * AVIC in x2APIC mode is not supported.
>>> +
>>> + * AVIC in nested virtualization setup is not supported.
>>> +
>>> ### sync_console
>>> > `= <boolean>`
>>
>> This wants to be part of the patch where the option is introduced. New
>> options
>
> I introduced 'svm_avic=nodoorbell' later in the series, after
> svm_avic= appears for the first time. So my thinking was to document
> all new options in one patch...
Please do this as (sub)options are being added.
Jan
|
