From bba4ed011a52d494aa7ef5e08cf226709bbf3f60 Mon Sep 17 00:00:00 2001 From: Tom Lendacky Date: Mon, 17 Jul 2017 16:10:28 -0500 Subject: x86/mm, kexec: Allow kexec to be used with SME MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Provide support so that kexec can be used to boot a kernel when SME is enabled. Support is needed to allocate pages for kexec without encryption. This is needed in order to be able to reboot in the kernel in the same manner as originally booted. Additionally, when shutting down all of the CPUs we need to be sure to flush the caches and then halt. This is needed when booting from a state where SME was not active into a state where SME is active (or vice-versa). Without these steps, it is possible for cache lines to exist for the same physical location but tagged both with and without the encryption bit. This can cause random memory corruption when caches are flushed depending on which cacheline is written last. Signed-off-by: Tom Lendacky Reviewed-by: Thomas Gleixner Reviewed-by: Borislav Petkov Cc: Cc: Alexander Potapenko Cc: Andrey Ryabinin Cc: Andy Lutomirski Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Brijesh Singh Cc: Dave Young Cc: Dmitry Vyukov Cc: Jonathan Corbet Cc: Konrad Rzeszutek Wilk Cc: Larry Woodman Cc: Linus Torvalds Cc: Matt Fleming Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Peter Zijlstra Cc: Radim Krčmář Cc: Rik van Riel Cc: Toshimitsu Kani Cc: kasan-dev@googlegroups.com Cc: kvm@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-efi@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/b95ff075db3e7cd545313f2fb609a49619a09625.1500319216.git.thomas.lendacky@amd.com Signed-off-by: Ingo Molnar --- include/linux/kexec.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/linux/kexec.h') diff --git a/include/linux/kexec.h b/include/linux/kexec.h index dd056fab9e35..2b7590f5483a 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -327,6 +327,14 @@ static inline void *boot_phys_to_virt(unsigned long entry) return phys_to_virt(boot_phys_to_phys(entry)); } +#ifndef arch_kexec_post_alloc_pages +static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; } +#endif + +#ifndef arch_kexec_pre_free_pages +static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { } +#endif + #else /* !CONFIG_KEXEC_CORE */ struct pt_regs; struct task_struct; -- cgit v1.2.3