> -----Original Message----- > From: Jarkko Sakkinen <jarkko@xxxxxxxxxx> > Sent: September 30, 2022 5:44 PM > To: Thomas Tai <thomas.tai@xxxxxxxxxx> > Cc: tony.luck@xxxxxxxxx; dave.hansen@xxxxxxxxxxxxxxx; > reinette.chatre@xxxxxxxx; naoya.horiguchi@xxxxxxx; linmiaohe@xxxxxxxxxx; > akpm@xxxxxxxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] x86/sgx: Add code to inject hwpoison into SGX memory > > On Tue, Sep 27, 2022 at 02:34:11PM -0400, Thomas Tai wrote: > > 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 | 3 +++ > > 2 files changed, 47 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..8134dc983699 100644 > > --- a/mm/hwpoison-inject.c > > +++ b/mm/hwpoison-inject.c > > @@ -21,6 +21,9 @@ static int hwpoison_inject(void *data, u64 val) > > if (!capable(CAP_SYS_ADMIN)) > > return -EPERM; > > > > + if (arch_is_platform_page(pfn << PAGE_SHIFT)) > > + goto inject; > > + > > if (!pfn_valid(pfn)) > > return -ENXIO; > > > > -- > > 2.31.1 > > > > Hey, this is really useful addition. Thanks for doing this. > > Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx> Thanks, Jarkko, for your review. Thomas > > BR, Jarkko
