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x86/mm: Don't attempt to encrypt initrd under SEV

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When SEV is active the initrd/initramfs will already have already been
placed in memory encrypted so do not try to encrypt it.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: kvm@vger.kernel.org
Cc: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20171020143059.3291-4-brijesh.singh@amd.com
This commit is contained in:
Tom Lendacky 2017-10-20 09:30:45 -05:00 committed by Thomas Gleixner
parent d8aa7eea78
commit 682af54399
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/setup.c
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@ -380,9 +380,11 @@ static void __init reserve_initrd(void)
* If SME is active, this memory will be marked encrypted by the
* kernel when it is accessed (including relocation). However, the
* ramdisk image was loaded decrypted by the bootloader, so make
* sure that it is encrypted before accessing it.
* sure that it is encrypted before accessing it. For SEV the
* ramdisk will already be encrypted, so only do this for SME.
*/
sme_early_encrypt(ramdisk_image, ramdisk_end - ramdisk_image);
if (sme_active())
sme_early_encrypt(ramdisk_image, ramdisk_end - ramdisk_image);
initrd_start = 0;