[PATCH v4 4/5] x86/efi: Tag e820_entries as crypto capable from EFI memmap

Martin Fernandez
2021-12-16T19:23:37Z

Add a function to iterate over the EFI Memory Map and mark the regions
tagged with EFI_MEMORY_CPU_CRYPTO in the e820_table; and call it from
efi_init if add_efi_memmap is disabled.

Also modify do_add_efi_memmap to mark the regions there.

Signed-off-by: Martin Fernandez <martin.fernandez@eclypsium.com>
---
arch/x86/platform/efi/efi.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 147c30a81f15..ce2f9d38fe36 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -184,6 +184,8 @@ static void __init do_add_efi_memmap(void)
}

e820__range_add(start, size, e820_type);
+ if (md->attribute & EFI_MEMORY_CPU_CRYPTO)
+ e820__range_mark_as_crypto_capable(start, size);
}
e820__update_table(e820_table);
}
@@ -441,6 +443,23 @@ static int __init efi_config_init(const efi_config_table_type_t *arch_tables)
return ret;
}

+static void __init efi_mark_e820_regions_as_crypto_capable(void)
+{
+ efi_memory_desc_t *md;
+
+ for_each_efi_memory_desc(md) {
+ if (md->attribute & EFI_MEMORY_CPU_CRYPTO)
+ e820__range_mark_as_crypto_capable(md->phys_addr,
+ md->num_pages << EFI_PAGE_SHIFT);
+ }
+
+ /*
+ * We added and modified regions so it's good to update the
+ * table to merge/sort
+ */
+ e820__update_table(e820_table);
+}
+
void __init efi_init(void)
{
if (IS_ENABLED(CONFIG_X86_32) &&
@@ -494,6 +513,13 @@ void __init efi_init(void)
set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
efi_clean_memmap();

+ /*
+ * If add_efi_memmap then there is no need to mark the regions
+ * again
+ */
+ if (!add_efi_memmap)
+ efi_mark_e820_regions_as_crypto_capable();
+
if (efi_enabled(EFI_DBG))
efi_print_memmap();
}
--
2.30.2