diff options
author | Tony Luck <tony.luck@intel.com> | 2021-10-27 01:00:44 +0300 |
---|---|---|
committer | Dave Hansen <dave.hansen@linux.intel.com> | 2021-11-15 22:13:16 +0300 |
commit | d6d261bded8a57aed4faa12d08a5b193418d3aa4 (patch) | |
tree | 487f2d252dbf7d1f3bf583d6d3f2f3e0c17bc943 /arch/x86/kernel/cpu/sgx/sgx.h | |
parent | fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf (diff) | |
download | linux-d6d261bded8a57aed4faa12d08a5b193418d3aa4.tar.xz |
x86/sgx: Add new sgx_epc_page flag bit to mark free pages
SGX EPC pages go through the following life cycle:
DIRTY ---> FREE ---> IN-USE --\
^ |
\-----------------/
Recovery action for poison for a DIRTY or FREE page is simple. Just
make sure never to allocate the page. IN-USE pages need some extra
handling.
Add a new flag bit SGX_EPC_PAGE_IS_FREE that is set when a page
is added to a free list and cleared when the page is allocated.
Notes:
1) These transitions are made while holding the node->lock so that
future code that checks the flags while holding the node->lock
can be sure that if the SGX_EPC_PAGE_IS_FREE bit is set, then the
page is on the free list.
2) Initially while the pages are on the dirty list the
SGX_EPC_PAGE_IS_FREE bit is cleared.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/20211026220050.697075-2-tony.luck@intel.com
Diffstat (limited to 'arch/x86/kernel/cpu/sgx/sgx.h')
-rw-r--r-- | arch/x86/kernel/cpu/sgx/sgx.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index 4628acec0009..5906471156c5 100644 --- a/arch/x86/kernel/cpu/sgx/sgx.h +++ b/arch/x86/kernel/cpu/sgx/sgx.h @@ -26,6 +26,9 @@ /* Pages, which are being tracked by the page reclaimer. */ #define SGX_EPC_PAGE_RECLAIMER_TRACKED BIT(0) +/* Pages on free list */ +#define SGX_EPC_PAGE_IS_FREE BIT(1) + struct sgx_epc_page { unsigned int section; unsigned int flags; |