linux-kernel - Re: [PATCH RESEND v2] PCI/MSI: Fix x86 VMs crash due to dereferencing NULL MSI domain

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Message-ID: <875xjuxivy.ffs@tglx>
Date: Thu, 27 Mar 2025 22:29:05 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Ashish Kalra
 <Ashish.Kalra@....com>
Cc: bhelgaas@...gle.com, jgross@...e.com, roger.pau@...rix.com,
 pstanner@...hat.com, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev
Subject: Re: [PATCH RESEND v2] PCI/MSI: Fix x86 VMs crash due to
 dereferencing NULL MSI domain

On Thu, Mar 27 2025 at 19:46, Andy Shevchenko wrote:

> On Thu, Mar 27, 2025 at 04:29:46PM +0000, Ashish Kalra wrote:
>> From: Ashish Kalra <ashish.kalra@....com>
>> 
>> Moving pci_msi_ignore_mask to per MSI domain flag is causing a panic
>> with SEV-SNP VMs under KVM while booting and initializing virtio-scsi
>> driver as below :
>
> Isn't it already fixed (in current Linus' master branch?

Yes it is.

  3ece3e8e5976 ("PCI/MSI: Handle the NOMASK flag correctly for all PCI/MSI backends")

And it is fixed so that it takes _all_ potential PCI/MSI backends into
account and not only papers over the problem at hand as pointed out in
the thread leading up to the above commit.

Thanks,

        tglx