diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/kexec.h | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/machine_kexec_64.c | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/relocate_kernel_64.S | 14 |
3 files changed, 18 insertions, 2 deletions
diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h index e8183acf931f..942c1f444da8 100644 --- a/arch/x86/include/asm/kexec.h +++ b/arch/x86/include/asm/kexec.h @@ -147,7 +147,8 @@ unsigned long relocate_kernel(unsigned long indirection_page, unsigned long page_list, unsigned long start_address, - unsigned int preserve_context); + unsigned int preserve_context, + unsigned int sme_active); #endif #define ARCH_HAS_KIMAGE_ARCH diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index 9cf8daacc046..1f790cf9d38f 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -335,7 +335,8 @@ void machine_kexec(struct kimage *image) image->start = relocate_kernel((unsigned long)image->head, (unsigned long)page_list, image->start, - image->preserve_context); + image->preserve_context, + sme_active()); #ifdef CONFIG_KEXEC_JUMP if (image->preserve_context) 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 |