[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH for-4.16 2/2] xen: Report grant table v1/v2 capabilities to the toolstack
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Sat, 30 Oct 2021 13:20:57 +0200
- Arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none
- Arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=eL9d3AAwjismmBUI/evhcZFncUj6y6jknF/XdMOfg6M=; b=SHN6KAc0y56wCDihIDTBrxa99QQhSquiITBJCuPh7vIn9bTfgxrZLmGND30OpBx3Zluiohf594QYrCHsB4iao41IYT3Zlr/TP8sGcIsXQKy4PQDLgUidmxNiDZB1CCLcls1LMUSCK6s3kKQqmczaCKYstTM8u/4nY4vGHbrRXnCfL22WquaaLryeHSw2HTsiW/OWq0jtkXM98vVTV6rDaWySSToHC0SkgUaUtiWG2K9Gb98MlvdnqU0obO+/R/QM8EeuJhj0jMF2mc5+iHNQplgPprLD97AHSMw9MSVB4zHmruM5i94ASOsGOW/DMIlysEjWkf2QoBP76Kfk57nMjQ==
- Arc-seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=mll9BnUoqrMnYSSkxMOupgQPnlrh9KRa1YjOoQ3P4JiOqLWD62Otf5J1MloIVbQPhMnIj/RD1d0ZThDDOJFd2PoPE5g6hBVJ/i0lE4csdiYp5HALH/PLQtF/+XM8rrElnU5JmmE2r8F57s74GmIEzQRtMz5JQBxMclzhMcVeE3057Yo2DdlGpGi9RQ8KeaAfW+vGuoHzmEnSSowN6jK48t9kO1un1jdHyQV6I764x+YbaggK4E/gN1tuRl+yzNiWkiIQ2Zj7ouNae5pcIWnHh55AbOo5QyErf98M4LarCvU3ODcqvgfeOWmkWGxXXnpOvB0dA7ne86HE2C84EoTr9g==
- Authentication-results: esa4.hc3370-68.iphmx.com; dkim=pass (signature verified) header.i=@citrix.onmicrosoft.com
- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Christian Lindig <christian.lindig@xxxxxxxxxx>, Edwin Török <edvin.torok@xxxxxxxxxx>
- Delivery-date: Sat, 30 Oct 2021 11:21:28 +0000
- Ironport-data: A9a23:1sVfn67Z9gbup8bFdjmVLgxRtKvAchMFZxGqfqrLsTDasY5as4F+v mAXWW/QaareZGOnL9Agbd6z9EtSsZXXnd9rHgpqqys3Hi5G8cbLO4+Ufxz6V8+wwmwvb67FA +E2MISowBUcFyeEzvuV3zyIQUBUjclkfJKlYAL/En03FVAMpBsJ00o5wrdh2dYw2LBVPivW0 T/Mi5yHULOa82Yc3lI8s8pvfzs24ZweEBtB1rAPTagjUG32zhH5P7pGTU2FFFPqQ5E8IwKPb 72rIIdVXI/u10xF5tuNyt4Xe6CRK1LYFVDmZnF+A8BOjvXez8CbP2lS2Pc0MC9qZzu1c99Z4 o4TmZOWEisTFYbgk8gnXhhmNxhMIvgTkFPHCSDXXc27ykTHdz3nwul0DVFwNoodkgp1KTgQr 7pCcmlLN03dwbLtqF64YrAEasALNs7kMZlZonh95TrYEewnUdbIRKCiCdpwgWdu3Z4QQae2i 8wxSSpBXjb+eAV2IFI4OsJnwaCDn0H4SmgNwL6SjfVuuDWCpOBr65D2K8bccNGOQcRTn26bq 3jA8mC/BQsVXPSAzRKV/3TqgfXA9Qv5RYYTGbuQ5vNsxlqJyQQ7GBAQEFe2v/S9okq/QM5Eb VwZ/DI0qqo//1DtScPyNzW5v3ysrhMaQ8BXEeAx9EeK0KW8yySzC3UATzVBQMc7r8JwTjsvv mJlhPuwW2Yp6ufMDyvAqPHE9lteJBT5M0coPnEoQi1ez+PIi604oijCT+hHKZyq24id9S7L/ xiGqy03hrM2hMEN1rmm8V2vvw9AtqQlXSZuuFyJAzvNAhdRIdf8Otf2sQSzAeNodd7BFjG8U G44d99yBQzkJbWEj2SzTeoEB9lFDN7VYWSH0TaD83TMnglBGkJPn6gMv1mSx28za67onAMFh meJ4Wu9A7cIZROXgVdfOd7ZNijT5fGI+S7Zfv7VdMFSRZN6aRWK+ipjDWbJgTuwzRN2wP5nY 87AGSpJMZr8If4/pNZRb7xEuYLHOwhknT+DLXwF503/uVZhWJJlYehcawbfBgzIxKiFvB/U4 75i2ziikH1ivBnFSnCPq+Y7dAlSRVBiXMyeg5EHJ4arf1s9cEl8WqC5/F/UU9E890ijvryTp S/Vt44x4AeXuEAr3i3TMS0+M+yzBc4XQLBSFXVEAGtEEkMLOO6HxKwea4E2bf8g8ulixuRzV P4LZ4OLBfEnd9gN0211gUDVoNMweRK1qxiJOib5MjEzc4Q5H17C+8P+fxup/y4LV3Llucw7q rym9wXaXZtcGFgyUJeIMKqinwGroHwQuONuRE+UcNNdT1rhrdpxICvrg/5pf8xVcUffxiGX3 hq9CAsDobWfuJc89dTE3PjWr4qgH+ZkMFBdGm3XseS/OSXApzLxyo5cSueYOzvaUTqsqqmlY OxUydD6MeEGwwkW49YtTe4zwPtntdX1prJcwgB1J1nxbgymWuF6P32L/chTrakRlLVXjhS7B xCU8d5ANLTXZM68SAwNJBAoZ/io3O0PnmWA9uw8JUj36XMl/LeDVkkObRCAhDYEcelwOYIhh +wgpNQX+0q0jR9zaoSKiSVd9mKtKH0cUvp46sFGUdGz0gd7mEtfZZH8CzPt5MDdYtpBBUAmP zuIifeQnL9b3EfDLyI+GHWlMTCxXnjSVMSmFGM/Gmk=
- Ironport-hdrordr: A9a23:HraR9aGgIJ/IIjHkpLqE7MeALOsnbusQ8zAXPidKOHtom62j5q STdZEgviMc5wx8ZJhNo7+90cq7IU80l6Qa3WB5B97LNmTbUQCTTb1K3M/PxCDhBj271sM179 YET0GmMqySMbGtt7eZ3DWF
- Ironport-sdr: v2R6uMXalIAMQYJ4EFPs7ugp4dMr3OHgreGRSlq1OaFYAf5qAXyGJJmmWJ2hXrAo8o2Cvrn/Np eQ5ZiUlL6A34JG92CvW3XSPiPyxKP6+WTsd+237VUgOCbBhM8bBXxaLNK6/eVsqnnHdK/bHR3T EM89pucHnCbC0FjvMGvdIT9NPZSkWrMg7lpqivs2MpIwvowWz2BX1oTHQ4ycPyjl9QESd0G3hp sUqikMNN8DtfsHb4GXpddaZjSnAaiEIPcfbLznyUjdeCZJ8X2qqyl0QYEmxojs55M6f66faVar K6ZzM+LRYOf4npHfLF2bJn20
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Oct 29, 2021 at 06:38:13PM +0100, Andrew Cooper wrote:
> In order to let the toolstack be able to set the gnttab version on a
> per-domain basis, it needs to know which ABIs Xen supports. Introduce
> XEN_SYSCTL_PHYSCAP_gnttab_v{1,2} for the purpose, and plumb in down into
> userspace.
I did consider exposing the versions supported together with
max_{grant,maptrack}_frames using a new grant-table dedicated sysctl,
but maybe it's fine to expose the version as a physcap and fetch the
other two separately?
I certainly didn't look much into this, maybe it's pointless to expose
max_{grant,maptrack}_frames. I think the toolstack will need to be
able to fetch grant related limits on a per-domain basis like we plan
to do with the grant version in order to assert the destination host
supports the current limit applied to the domain.
Thanks, Roger.
|
