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Date:   Tue, 12 Oct 2021 09:07:31 -0400
From:   Jason Andryuk <>
To:     Josef Johansson <>
Cc:     Thomas Gleixner <>,,,
        open list <>,
        xen-devel <>
Subject: Re: [REGRESSION][BISECTED] 5.15-rc1: Broken AHCI on NVIDIA ION (MCP79)

On Tue, Oct 12, 2021 at 2:09 AM Josef Johansson <> wrote:
> On 10/11/21 21:34, Josef Johansson wrote:
> > On 10/11/21 20:47, Josef Johansson wrote:
> >> More can be read over at freedesktop:
> >>

Hi, Josef,

If you compare
commit fcacdfbef5a1633211ebfac1b669a7739f5b553e "PCI/MSI: Provide a
new set of mask and unmask functions"
commit 446a98b19fd6da97a1fb148abb1766ad89c9b767 "PCI/MSI: Use new
mask/unmask functions" some of the replacement functions in 446198b1
no longer exit early for the pci_msi_ignore_mask flag.

Josef, I'd recommend you try adding pci_msi_ignore_mask checks to the
new functions in fcacdfbef5a to see if that helps.

There was already a pci_msi_ignore_mask fixup in commit
1a519dc7a73c977547d8b5108d98c6e769c89f4b "PCI/MSI: Skip masking MSI-X
on Xen PV" though the kernel was crashing in that case.


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