Re: [PATCH 6.6.y] scsi: storvsc: Ratelimit warning logs to prevent VM denial of service

[Easwar Hariharan <eahariha@linux.microsoft.com>]

On 1/27/2025 10:29 AM, Easwar Hariharan wrote:
> commit d2138eab8cde61e0e6f62d0713e45202e8457d6d upstream
> 
> If there's a persistent error in the hypervisor, the SCSI warning for
> failed I/O can flood the kernel log and max out CPU utilization,
> preventing troubleshooting from the VM side. Ratelimit the warning so
> it doesn't DoS the VM.
> 
> Closes: https://github.com/microsoft/WSL/issues/9173
> Signed-off-by: Easwar Hariharan <eahariha@linux.microsoft.com>
> Link: https://lore.kernel.org/r/20250107-eahariha-ratelimit-storvsc-v1-1-7fc193d1f2b0@linux.microsoft.com
> Reviewed-by: Michael Kelley <mhklinux@outlook.com>
> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
> Signed-off-by: Easwar Hariharan <eahariha@linux.microsoft.com>
> ---
>  drivers/scsi/storvsc_drv.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 

I just remembered that we should wait for Linus to tag the rc before
sending backports, so apologies for sending this (and its 6.1 and 6.12
friends) out before rc1 was tagged.

- Easwar (he/him)