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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: KEdWw/XFC1C6dInRQPBRdmM+g4w/lPj8FVj0iVoYExkQ6hp0yvCbFd+nH2AY4T3rXX3RxmimB/CwNNPjwn86yoZ28X/aSqrmjtSb5cPzVmI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR10MB6441 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-29_04,2025-01-29_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxscore=0 bulkscore=0 phishscore=0 suspectscore=0 adultscore=0 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2411120000 definitions=main-2501290146 X-Proofpoint-GUID: S9x-jyZuWRyTvBuzcp4L6aNDSp2xGnaa X-Proofpoint-ORIG-GUID: S9x-jyZuWRyTvBuzcp4L6aNDSp2xGnaa On 30/01/25 12:13 AM, Jürgen Groß wrote: > On 29.01.25 19:35, Harshvardhan Jha wrote: >> >> On 29/01/25 4:52 PM, Juergen Gross wrote: >>> On 29.01.25 10:15, Harshvardhan Jha wrote: >>>> >>>> On 29/01/25 2:34 PM, Greg KH wrote: >>>>> On Wed, Jan 29, 2025 at 02:29:48PM +0530, Harshvardhan Jha wrote: >>>>>> Hi Greg, >>>>>> >>>>>> On 29/01/25 2:18 PM, Greg KH wrote: >>>>>>> On Wed, Jan 29, 2025 at 02:13:34PM +0530, Harshvardhan Jha wrote: >>>>>>>> Hi there, >>>>>>>> >>>>>>>> On 29/01/25 2:05 PM, Greg KH wrote: >>>>>>>>> On Wed, Jan 29, 2025 at 02:03:51PM +0530, Harshvardhan Jha wrote: >>>>>>>>>> Hi All, >>>>>>>>>> >>>>>>>>>> +stable >>>>>>>>>> >>>>>>>>>> There seems to be some formatting issues in my log output. I >>>>>>>>>> have >>>>>>>>>> attached it as a file. >>>>>>>>> Confused, what are you wanting us to do here in the stable tree? >>>>>>>>> >>>>>>>>> thanks, >>>>>>>>> >>>>>>>>> greg k-h >>>>>>>> Since, this is reproducible on 5.4.y I have added stable. The >>>>>>>> culprit >>>>>>>> commit which upon getting reverted fixes this issue is also >>>>>>>> present in >>>>>>>> 5.4.y stable. >>>>>>> What culprit commit?  I see no information here :( >>>>>>> >>>>>>> Remember, top-posting is evil... >>>>>> My apologies, >>>>>> >>>>>> The stable tag v5.4.289 seems to fail to boot with the following >>>>>> prompt in an infinite loop: >>>>>> [   24.427217] megaraid_sas 0000:65:00.0: megasas_build_io_fusion >>>>>> 3273 sge_count (-12) is out of range. Range is:  0-256 >>>>>> >>>>>> Reverting the following patch seems to fix the issue: >>>>>> >>>>>> stable-5.4      : v5.4.285             - 5df29a445f3a >>>>>> xen/swiotlb: add >>>>>> alignment check for dma buffers >>>>>> >>>>>> I tried changing swiotlb grub command line arguments but that didn't >>>>>> seem to help much unfortunately and the error was seen again. >>>>>> >>>>> Ok, can you submit this revert with the information about why it >>>>> should >>>>> not be included in the 5.4.y tree and cc: everyone involved and >>>>> then we >>>>> will be glad to queue it up. >>>>> >>>>> thanks, >>>>> >>>>> greg k-h >>>> >>>> This might be reproducible on other stable trees and mainline as >>>> well so >>>> we will get it fixed there and I will submit the necessary fix to >>>> stable >>>> when everything is sorted out on mainline. >>> >>> Right. Just reverting my patch will trade one error with another one >>> (the >>> one which triggered me to write the patch). >>> >>> There are two possible ways to fix the issue: >>> >>> - allow larger DMA buffers in xen/swiotlb (today 2MB are the max. >>> supported >>>    size, the megaraid_sas driver seems to effectively request 4MB) >> >> This seems relatively simpler to implement but I'm not sure whether it's >> the most optimal approach > > Just making the static array larger used to hold the frame numbers for > the > buffer seems to be a waste of memory for most configurations. Yep definitely not required in most cases. > > I'm thinking of an allocated array using the max needed size (replace a > former buffer with a larger one if needed). This seems like the right way to go. Harshvardhan > > > Juergen > > Juergen