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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-29 14:34:06 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-29 14:34:06 -0700
commite75417739b1de4f6eb99f3f080c67bfd6812d562 (patch)
tree85ee529dd51c22fe323533df47c39d18e0d8d205
parente1ce697db67421cc7e9a1cc1312149f3a4e08c93 (diff)
parentbdec8d7fa55e6f5314ed72e5a0b435d90ff90548 (diff)
downloadlinux-stericsson-e75417739b1de4f6eb99f3f080c67bfd6812d562.tar.gz
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Thomas writes: "A single fix for the AMD memory encryption boot code so it does not read random garbage instead of the cached encryption bit when a kexec kernel is allocated above the 32bit address limit." * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/boot: Fix kexec booting failure in the SEV bit detection code
-rw-r--r--arch/x86/boot/compressed/mem_encrypt.S19
1 files changed, 0 insertions, 19 deletions
diff --git a/arch/x86/boot/compressed/mem_encrypt.S b/arch/x86/boot/compressed/mem_encrypt.S
index eaa843a52907..a480356e0ed8 100644
--- a/arch/x86/boot/compressed/mem_encrypt.S
+++ b/arch/x86/boot/compressed/mem_encrypt.S
@@ -25,20 +25,6 @@ ENTRY(get_sev_encryption_bit)
push %ebx
push %ecx
push %edx
- push %edi
-
- /*
- * RIP-relative addressing is needed to access the encryption bit
- * variable. Since we are running in 32-bit mode we need this call/pop
- * sequence to get the proper relative addressing.
- */
- call 1f
-1: popl %edi
- subl $1b, %edi
-
- movl enc_bit(%edi), %eax
- cmpl $0, %eax
- jge .Lsev_exit
/* Check if running under a hypervisor */
movl $1, %eax
@@ -69,15 +55,12 @@ ENTRY(get_sev_encryption_bit)
movl %ebx, %eax
andl $0x3f, %eax /* Return the encryption bit location */
- movl %eax, enc_bit(%edi)
jmp .Lsev_exit
.Lno_sev:
xor %eax, %eax
- movl %eax, enc_bit(%edi)
.Lsev_exit:
- pop %edi
pop %edx
pop %ecx
pop %ebx
@@ -113,8 +96,6 @@ ENTRY(set_sev_encryption_mask)
ENDPROC(set_sev_encryption_mask)
.data
-enc_bit:
- .int 0xffffffff
#ifdef CONFIG_AMD_MEM_ENCRYPT
.balign 8