From 1ea7ca1b090145519aad998679222f0a14ab8fce Mon Sep 17 00:00:00 2001 From: Jane Chu Date: Thu, 15 Jun 2023 12:13:25 -0600 Subject: dax: enable dax fault handler to report VM_FAULT_HWPOISON When multiple processes mmap() a dax file, then at some point, a process issues a 'load' and consumes a hwpoison, the process receives a SIGBUS with si_code = BUS_MCEERR_AR and with si_lsb set for the poison scope. Soon after, any other process issues a 'load' to the poisoned page (that is unmapped from the kernel side by memory_failure), it receives a SIGBUS with si_code = BUS_ADRERR and without valid si_lsb. This is confusing to user, and is different from page fault due to poison in RAM memory, also some helpful information is lost. Channel dax backend driver's poison detection to the filesystem such that instead of reporting VM_FAULT_SIGBUS, it could report VM_FAULT_HWPOISON. If user level block IO syscalls fail due to poison, the errno will be converted to EIO to maintain block API consistency. Signed-off-by: Jane Chu Link: https://lore.kernel.org/r/20230615181325.1327259-2-jane.chu@oracle.com Reviewed-by: Dan Williams Signed-off-by: Vishal Verma --- include/linux/mm.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/mm.h') diff --git a/include/linux/mm.h b/include/linux/mm.h index 27ce77080c79..052ac9317365 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3342,6 +3342,8 @@ static inline vm_fault_t vmf_error(int err) { if (err == -ENOMEM) return VM_FAULT_OOM; + else if (err == -EHWPOISON) + return VM_FAULT_HWPOISON; return VM_FAULT_SIGBUS; } -- cgit v1.2.3