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SubjectRe: [PATCH v6 14/34] x86/mm: Insure that boot memory areas are mapped properly
On Wed, Jun 07, 2017 at 02:15:39PM -0500, Tom Lendacky wrote:
> The boot data and command line data are present in memory in a decrypted
> state and are copied early in the boot process. The early page fault
> support will map these areas as encrypted, so before attempting to copy
> them, add decrypted mappings so the data is accessed properly when copied.
>
> For the initrd, encrypt this data in place. Since the future mapping of the
> initrd area will be mapped as encrypted the data will be accessed properly.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---
> arch/x86/include/asm/mem_encrypt.h | 11 +++++
> arch/x86/include/asm/pgtable.h | 3 +
> arch/x86/kernel/head64.c | 30 ++++++++++++--
> arch/x86/kernel/setup.c | 9 ++++
> arch/x86/mm/mem_encrypt.c | 77 ++++++++++++++++++++++++++++++++++++
> 5 files changed, 126 insertions(+), 4 deletions(-)

Some cleanups ontop in case you get to send v7:

diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index 61a704945294..5959a42dd4d5 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -45,13 +45,8 @@ static inline void __init sme_early_decrypt(resource_size_t paddr,
{
}

-static inline void __init sme_map_bootdata(char *real_mode_data)
-{
-}
-
-static inline void __init sme_unmap_bootdata(char *real_mode_data)
-{
-}
+static inline void __init sme_map_bootdata(char *real_mode_data) { }
+static inline void __init sme_unmap_bootdata(char *real_mode_data) { }

static inline void __init sme_early_init(void)
{
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 2321f05045e5..32ebbe0ab04d 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -132,6 +132,10 @@ static void __init __sme_map_unmap_bootdata(char *real_mode_data, bool map)
struct boot_params *boot_data;
unsigned long cmdline_paddr;

+ /* If SME is not active, the bootdata is in the correct state */
+ if (!sme_active())
+ return;
+
__sme_early_map_unmap_mem(real_mode_data, sizeof(boot_params), map);
boot_data = (struct boot_params *)real_mode_data;

@@ -142,40 +146,22 @@ static void __init __sme_map_unmap_bootdata(char *real_mode_data, bool map)
cmdline_paddr = boot_data->hdr.cmd_line_ptr |
((u64)boot_data->ext_cmd_line_ptr << 32);

- if (cmdline_paddr)
- __sme_early_map_unmap_mem(__va(cmdline_paddr),
- COMMAND_LINE_SIZE, map);
+ if (!cmdline_paddr)
+ return;
+
+ __sme_early_map_unmap_mem(__va(cmdline_paddr), COMMAND_LINE_SIZE, map);
+
+ sme_early_pgtable_flush();
}

void __init sme_unmap_bootdata(char *real_mode_data)
{
- /* If SME is not active, the bootdata is in the correct state */
- if (!sme_active())
- return;
-
- /*
- * The bootdata and command line aren't needed anymore so clear
- * any mapping of them.
- */
__sme_map_unmap_bootdata(real_mode_data, false);
-
- sme_early_pgtable_flush();
}

void __init sme_map_bootdata(char *real_mode_data)
{
- /* If SME is not active, the bootdata is in the correct state */
- if (!sme_active())
- return;
-
- /*
- * The bootdata and command line will not be encrypted, so they
- * need to be mapped as decrypted memory so they can be copied
- * properly.
- */
__sme_map_unmap_bootdata(real_mode_data, true);
-
- sme_early_pgtable_flush();
}

void __init sme_early_init(void)
--
Regards/Gruss,
Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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