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Harshvardhan Jha wrote: >>> 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. >> Can you try the attached patch, please? I don't have a system at hand >> showing the problem. > I tried this and got this error in an infinite loop again: > [   25.827922] megaraid_sas 0000:65:00.0: megasas_build_io_fusion 3273 > sge_count (-12) is out of range. Range is:  0-256 > [   25.828447] megaraid_sas 0000:65:00.0: Error building command Would this require a change in the megasas driver also as simply changing xen code isn't fixing the issue? Harshvardhan >> >> Juergen