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-rw-r--r--arch/x86/kernel/relocate_kernel_64.S14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
index 98111b38ebfd..307d3bac5f04 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -47,6 +47,7 @@ relocate_kernel:
* %rsi page_list
* %rdx start address
* %rcx preserve_context
+ * %r8 sme_active
*/
/* Save the CPU context, used for jumping back */
@@ -71,6 +72,9 @@ relocate_kernel:
pushq $0
popfq
+ /* Save SME active flag */
+ movq %r8, %r12
+
/*
* get physical address of control page now
* this is impossible after page table switch
@@ -132,6 +136,16 @@ identity_mapped:
/* Flush the TLB (needed?) */
movq %r9, %cr3
+ /*
+ * If SME is active, there could be old encrypted cache line
+ * entries that will conflict with the now unencrypted memory
+ * used by kexec. Flush the caches before copying the kernel.
+ */
+ testq %r12, %r12
+ jz 1f
+ wbinvd
+1:
+
movq %rcx, %r11
call swap_pages