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authorTom Lendacky <thomas.lendacky@amd.com>2017-07-28 19:01:16 +0300
committerIngo Molnar <mingo@kernel.org>2017-07-30 13:09:12 +0300
commit4e237903f95db585b976e7311de2bfdaaf0f6e31 (patch)
treed91a782eb24dc6409406be5ed50a736543aaf9f2 /arch/x86/include/asm/kexec.h
parentf90e2d9a5235bdcfcf1979f5e4b40684e778d18b (diff)
downloadlinux-4e237903f95db585b976e7311de2bfdaaf0f6e31.tar.xz
x86/mm, kexec: Fix memory corruption with SME on successive kexecs
After issuing successive kexecs it was found that the SHA hash failed verification when booting the kexec'd kernel. When SME is enabled, the change from using pages that were marked encrypted to now being marked as not encrypted (through new identify mapped page tables) results in memory corruption if there are any cache entries for the previously encrypted pages. This is because separate cache entries can exist for the same physical location but tagged both with and without the encryption bit. To prevent this, issue a wbinvd if SME is active before copying the pages from the source location to the destination location to clear any possible cache entry conflicts. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Cc: <kexec@lists.infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Dave Young <dyoung@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/e7fb8610af3a93e8f8ae6f214cd9249adc0df2b4.1501186516.git.thomas.lendacky@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/kexec.h')
-rw-r--r--arch/x86/include/asm/kexec.h3
1 files changed, 2 insertions, 1 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