Commit-ID: 65f750e5457aef9a8085a99d613fea0430303e93 Gitweb: https://git.kernel.org/tip/65f750e5457aef9a8085a99d613fea0430303e93 Author: Lianbo Jiang <liji...@redhat.com> AuthorDate: Thu, 10 Jan 2019 20:19:44 +0800 Committer: Borislav Petkov <b...@suse.de> CommitDate: Fri, 11 Jan 2019 16:09:25 +0100
x86/kdump: Export the SME mask to vmcoreinfo On AMD SME machines, makedumpfile tools need to know whether the crashed kernel was encrypted. If SME is enabled in the first kernel, the crashed kernel's page table entries (pgd/pud/pmd/pte) contain the memory encryption mask which makedumpfile needs to remove in order to obtain the true physical address. Export that mask in a vmcoreinfo variable. [ bp: Massage commit message and move define at the end of the function. ] Signed-off-by: Lianbo Jiang <liji...@redhat.com> Signed-off-by: Borislav Petkov <b...@suse.de> Cc: "H. Peter Anvin" <h...@zytor.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Baoquan He <b...@redhat.com> Cc: Dave Young <dyo...@redhat.com> Cc: Ingo Molnar <mi...@redhat.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Tom Lendacky <thomas.lenda...@amd.com> Cc: ander...@redhat.com Cc: k-ha...@ab.jp.nec.com Cc: ke...@lists.infradead.org Cc: linux-...@vger.kernel.org Cc: x86-ml <x...@kernel.org> Link: https://lkml.kernel.org/r/20190110121944.6050-3-liji...@redhat.com --- arch/x86/kernel/machine_kexec_64.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index 4c8acdfdc5a7..ceba408ea982 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -352,6 +352,8 @@ void machine_kexec(struct kimage *image) void arch_crash_save_vmcoreinfo(void) { + u64 sme_mask = sme_me_mask; + VMCOREINFO_NUMBER(phys_base); VMCOREINFO_SYMBOL(init_top_pgt); vmcoreinfo_append_str("NUMBER(pgtable_l5_enabled)=%d\n", @@ -364,6 +366,7 @@ void arch_crash_save_vmcoreinfo(void) vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset()); VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE); + VMCOREINFO_NUMBER(sme_mask); } /* arch-dependent functionality related to kexec file-based syscall */
