diff options
| author | Easwar Hariharan <eahariha@linux.microsoft.com> | 2025-01-07 17:28:40 +0000 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2025-01-10 16:23:28 -0500 |
| commit | d2138eab8cde61e0e6f62d0713e45202e8457d6d (patch) | |
| tree | bbbe1a93fb265e5eb006bca36b27b125f9a88b32 | |
| parent | 37d061e1ace17a376eda34b10dde28b144296534 (diff) | |
scsi: storvsc: Ratelimit warning logs to prevent VM denial of service
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>
| -rw-r--r-- | drivers/scsi/storvsc_drv.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 45665d4aca92..5a101ac06c47 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -171,6 +171,12 @@ do { \ dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ } while (0) +#define storvsc_log_ratelimited(dev, level, fmt, ...) \ +do { \ + if (do_logging(level)) \ + dev_warn_ratelimited(&(dev)->device, fmt, ##__VA_ARGS__); \ +} while (0) + struct vmscsi_request { u16 length; u8 srb_status; @@ -1176,7 +1182,7 @@ static void storvsc_on_io_completion(struct storvsc_device *stor_device, int loglevel = (stor_pkt->vm_srb.cdb[0] == TEST_UNIT_READY) ? STORVSC_LOGGING_WARN : STORVSC_LOGGING_ERROR; - storvsc_log(device, loglevel, + storvsc_log_ratelimited(device, loglevel, "tag#%d cmd 0x%x status: scsi 0x%x srb 0x%x hv 0x%x\n", scsi_cmd_to_rq(request->cmd)->tag, stor_pkt->vm_srb.cdb[0], |