Messages in this thread | | | Subject | Re: [PATCH v4 2/6] x86/sgx: Add infrastructure to identify SGX EPC pages | From | Jarkko Sakkinen <> | Date | Wed, 01 Sep 2021 07:30:07 +0300 |
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On Fri, 2021-08-27 at 12:55 -0700, Tony Luck wrote: > X86 machine check architecture reports a physical address when there > is a memory error. Handling that error requires a method to determine > whether the physical address reported is in any of the areas reserved > for EPC pages by BIOS. > > SGX EPC pages do not have Linux "struct page" associated with them. > > Keep track of the mapping from ranges of EPC pages to the sections > that contain them using an xarray. > > Create a function sgx_is_epc_page() that simply reports whether an address > is an EPC page for use elsewhere in the kernel. The ACPI error injection > code needs this function and is typically built as a module, so export it. > > Note that sgx_is_epc_page() will be slower than other similar "what type > is this page" functions that can simply check bits in the "struct page". > If there is some future performance critical user of this function it > may need to be implemented in a more efficient way. > > Signed-off-by: Tony Luck <tony.luck@intel.com> > --- > arch/x86/kernel/cpu/sgx/main.c | 10 ++++++++++ > arch/x86/kernel/cpu/sgx/sgx.h | 1 + > 2 files changed, 11 insertions(+) > > diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c > index 4a5b51d16133..261f81b3f8af 100644 > --- a/arch/x86/kernel/cpu/sgx/main.c > +++ b/arch/x86/kernel/cpu/sgx/main.c > @@ -20,6 +20,7 @@ struct sgx_epc_section sgx_epc_sections[SGX_MAX_EPC_SECTIONS]; > static int sgx_nr_epc_sections; > static struct task_struct *ksgxd_tsk; > static DECLARE_WAIT_QUEUE_HEAD(ksgxd_waitq); > +static DEFINE_XARRAY(epc_page_ranges);
Maybe we could just call this "sgx_epc_address_space"?
/Jarkko
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