From: "Jonathan (Zhixiong) Zhang" <zjzhang@xxxxxxxxxxxxxx>
... to allow arch specific implementation of getting page
protection type associated with a physical address.
On x86, we currently have no way to lookup the EFI memory map
attributes for a region in a consistent way because the
memmap is discarded after efi_free_boot_services(). So if
you call efi_mem_attributes() during boot and at runtime,
you could theoretically see different attributes.
Since we are yet to see any x86 platforms that require
anything other than PAGE_KERNEL (some arm64 platforms
require the equivalent of PAGE_KERNEL_NOCACHE), return that
until we know differently.
Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@xxxxxxxxxxxxxx>
---
arch/x86/kernel/acpi/apei.c | 19 +++++++++++++++++++
include/acpi/apei.h | 1 +
2 files changed, 20 insertions(+)
diff --git a/arch/x86/kernel/acpi/apei.c b/arch/x86/kernel/acpi/apei.c
index c280df6b2aa2..675bd46c4e17 100644
--- a/arch/x86/kernel/acpi/apei.c
+++ b/arch/x86/kernel/acpi/apei.c
@@ -60,3 +60,22 @@ void arch_apei_flush_tlb_one(unsigned long addr)
{
__flush_tlb_one(addr);
}
+
+static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
+{
+
+ /*
+ * We currently have no way to lookup the EFI memory map
+ * attributes for a region in a consistent way because the
+ * memmap is discarded after efi_free_boot_services(). So if
+ * you call efi_mem_attributes() during boot and at runtime,
+ * you could theoretically see different attributes.
+ *
+ * Since we are yet to see any x86 platforms that require
+ * anything other than PAGE_KERNEL (some arm64 platforms
+ * require the equivalent of PAGE_KERNEL_NOCACHE), return that
+ * until we know differently.
+ */
+
+ return PAGE_KERNEL;
+}
diff --git a/include/acpi/apei.h b/include/acpi/apei.h
index 284801ac7042..64a12ce9880b 100644
--- a/include/acpi/apei.h
+++ b/include/acpi/apei.h
@@ -46,6 +46,7 @@ int erst_clear(u64 record_id);
int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data);
void arch_apei_report_mem_error(int sev, struct cper_sec_mem_err *mem_err);
void arch_apei_flush_tlb_one(unsigned long addr);
+pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
#endif
#endif
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