From: Easwar Hariharan eahariha@linux.microsoft.com
[ Upstream commit d2138eab8cde61e0e6f62d0713e45202e8457d6d ]
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-v1-1-7fc193d1f... Reviewed-by: Michael Kelley mhklinux@outlook.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/storvsc_drv.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index d0b55c1fa908a..b3c588b102d90 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; @@ -1177,7 +1183,7 @@ 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],