On Fri, 2021-10-01 at 09:47 -0700, Tony Luck wrote: > A memory controller patrol scrubber can report poison in a page > that isn't currently being used. > > Add "poison" field in the sgx_epc_page that can be set for an > sgx_epc_page. Check for it: > 1) When sanitizing dirty pages > 2) When freeing epc pages > > Poison is a new field separated from flags to avoid having to make > all updates to flags atomic, or integrate poison state changes into > some other locking scheme to protect flags. > > In both cases place the poisoned page on a list of poisoned epc pages > to make sure it will not be reallocated. > > Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx> > --- > arch/x86/kernel/cpu/sgx/main.c | 14 +++++++++++++- > arch/x86/kernel/cpu/sgx/sgx.h | 3 ++- > 2 files changed, 15 insertions(+), 2 deletions(-) Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx> /Jarkko
