Inspired by commit c6acb1e7bf46 (x86/sgx: Add hook to error injection address validation), add a similar code in hwpoison_inject function to check if the address is located in SGX Memory. The error will then be handled by the arch_memory_failure function in the SGX driver. Signed-off-by: Thomas Tai <thomas.tai@xxxxxxxxxx> --- Documentation/mm/hwpoison.rst | 44 +++++++++++++++++++++++++++++++++++ mm/hwpoison-inject.c | 4 ++++ 2 files changed, 48 insertions(+) diff --git a/Documentation/mm/hwpoison.rst b/Documentation/mm/hwpoison.rst index b9d5253c1305..8a542aca4744 100644 --- a/Documentation/mm/hwpoison.rst +++ b/Documentation/mm/hwpoison.rst @@ -162,6 +162,50 @@ Testing Some portable hwpoison test programs in mce-test, see below. +* Special notes for injection into SGX enclaves + + 1) Determine physical address of enclave page + + dmesg | grep "sgx: EPC" + + sgx: EPC section 0x8000c00000-0x807f7fffff + sgx: EPC section 0x10000c00000-0x1007fffffff + + 2) Convert the EPC address to page frame number. + + For 4K page size, the page frame number for 0x8000c00000 is + 0x8000c00000 / 0x1000 = 0x8000c00. + + 3) Trace memory_failure + + echo nop > /sys/kernel/tracing/current_tracer + echo *memory_failure > /sys/kernel/tracing/set_ftrace_filter + echo function > /sys/kernel/tracing/current_tracer + + 4) Inject a memory error + + modprobe hwpoison-inject + echo "0x8000c00" > /sys/kernel/debug/hwpoison/corrupt-pfn + + 5) Check the trace output + + cat /sys/kernel/tracing/trace + + # tracer: function + # + # entries-in-buffer/entries-written: 2/2 #P:128 + # + # _-----=> irqs-off + # / _----=> need-resched + # | / _---=> hardirq/softirq + # || / _--=> preempt-depth + # ||| / _-=> migrate-disable + # |||| / delay + # TASK-PID CPU# ||||| TIMESTAMP FUNCTION + # | | | ||||| | | + bash-12167 [002] ..... 113.136808: memory_failure<-simple_attr_write + bash-12167 [002] ..... 113.136810: arch_memory_failure<-memory_failure + References ========== diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c index 65e242b5a432..bf83111c1d9b 100644 --- a/mm/hwpoison-inject.c +++ b/mm/hwpoison-inject.c @@ -21,6 +21,10 @@ static int hwpoison_inject(void *data, u64 val) if (!capable(CAP_SYS_ADMIN)) return -EPERM; + /* Inject the error if the page is part of the processor reserved memory */ + if (arch_is_platform_page(pfn << PAGE_SHIFT)) + goto inject; + if (!pfn_valid(pfn)) return -ENXIO; -- 2.31.1
