Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
On 08/25/2018 08:07 AM, Greg Kroah-Hartman wrote: On Sat, Aug 25, 2018 at 06:52:32AM -0700, Guenter Roeck wrote: Hi Roland, On 08/24/2018 01:04 PM, Roland Dreier wrote: Ok, so what patch should be reverted? I'm seeing other reports of problems all around this same area, but I can't figure out exactly what to do. Are any of those reports public? If so can you point me at them, I'm curious if the symptoms match up. I don't think we want to revert anything. I think you should pull in edc3b9129cec and at least the first three patches that Ben listed: 21cdb6b56843 x86/mm: Page align the '_end' symbol to avoid pfn conversion bugs b61a76f8850d x86/efi: Map RAM into the identity page table for mixed mode 753b11ef8e92 x86/efi: Setup separate EFI page tables in kexec paths the first patch takes a bit of massaging (mostly because some of it is already touched by 02ff2769edbc, which keeps the changes from edc3b9129cec, and so we can drop a good bit when applying). The other three apply cleanly. I'm currently testing that and can send you the state of my tree in a bit. Have you made any progress ? On my side I am still out of luck since I can not reproduce the problem. Perhaps just the patch that Andi posted to the stable list helps out here? For reference: https://www.spinics.net/lists/stable/msg253357.html That would be the most straightforward and simple fix, so I would prefer to go with it if it works. Guenter
Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
On Sat, Aug 25, 2018 at 06:52:32AM -0700, Guenter Roeck wrote: > Hi Roland, > > On 08/24/2018 01:04 PM, Roland Dreier wrote: > > > Ok, so what patch should be reverted? I'm seeing other reports of > > > problems all around this same area, but I can't figure out exactly what > > > to do. > > > > Are any of those reports public? If so can you point me at them, I'm > > curious if the symptoms match up. > > > > I don't think we want to revert anything. I think you should pull in > > edc3b9129cec and at least the first three patches that Ben listed: > > > > 21cdb6b56843 x86/mm: Page align the '_end' symbol to avoid pfn conversion > > bugs > > b61a76f8850d x86/efi: Map RAM into the identity page table for mixed mode > > 753b11ef8e92 x86/efi: Setup separate EFI page tables in kexec paths > > > > the first patch takes a bit of massaging (mostly because some of it is > > already touched by 02ff2769edbc, which keeps the changes from > > edc3b9129cec, and so we can drop a good bit when applying). The other > > three apply cleanly. > > > > I'm currently testing that and can send you the state of my tree in a bit. > > > > Have you made any progress ? On my side I am still out of luck since I can not > reproduce the problem. Perhaps just the patch that Andi posted to the stable list helps out here? Roland, can you try just that? thanks, greg k-h
Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
Hi Roland, On 08/24/2018 01:04 PM, Roland Dreier wrote: Ok, so what patch should be reverted? I'm seeing other reports of problems all around this same area, but I can't figure out exactly what to do. Are any of those reports public? If so can you point me at them, I'm curious if the symptoms match up. I don't think we want to revert anything. I think you should pull in edc3b9129cec and at least the first three patches that Ben listed: 21cdb6b56843 x86/mm: Page align the '_end' symbol to avoid pfn conversion bugs b61a76f8850d x86/efi: Map RAM into the identity page table for mixed mode 753b11ef8e92 x86/efi: Setup separate EFI page tables in kexec paths the first patch takes a bit of massaging (mostly because some of it is already touched by 02ff2769edbc, which keeps the changes from edc3b9129cec, and so we can drop a good bit when applying). The other three apply cleanly. I'm currently testing that and can send you the state of my tree in a bit. Have you made any progress ? On my side I am still out of luck since I can not reproduce the problem. Thanks, Guenter
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