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    SubjectRe: [PATCH v4 2/6] x86/sgx: Add infrastructure to identify SGX EPC pages
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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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