From: Lianbo Jiang <liji...@redhat.com> [ Upstream commit 9cf38d5559e813cccdba8b44c82cc46ba48d0896 ]
When SME is enabled in the first kernel, it needs to allocate decrypted pages for kdump because when the kdump kernel boots, these pages need to be accessed decrypted in the initial boot stage, before SME is enabled. [ bp: clean up text. ] Signed-off-by: Lianbo Jiang <liji...@redhat.com> Signed-off-by: Borislav Petkov <b...@suse.de> Reviewed-by: Tom Lendacky <thomas.lenda...@amd.com> Cc: kexec@lists.infradead.org Cc: t...@linutronix.de Cc: mi...@redhat.com Cc: h...@zytor.com Cc: a...@linux-foundation.org Cc: dan.j.willi...@intel.com Cc: bhelg...@google.com Cc: baiyao...@cmss.chinamobile.com Cc: ti...@suse.de Cc: brijesh.si...@amd.com Cc: dyo...@redhat.com Cc: b...@redhat.com Cc: jroe...@suse.de Link: https://lkml.kernel.org/r/20180930031033.22110-3-liji...@redhat.com Signed-off-by: Sasha Levin <sas...@kernel.org> --- kernel/kexec_core.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index 8f15665ab6167..27cf24e285e0c 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -473,6 +473,10 @@ static struct page *kimage_alloc_crash_control_pages(struct kimage *image, } } + /* Ensure that these pages are decrypted if SME is enabled. */ + if (pages) + arch_kexec_post_alloc_pages(page_address(pages), 1 << order, 0); + return pages; } @@ -867,6 +871,7 @@ static int kimage_load_crash_segment(struct kimage *image, result = -ENOMEM; goto out; } + arch_kexec_post_alloc_pages(page_address(page), 1, 0); ptr = kmap(page); ptr += maddr & ~PAGE_MASK; mchunk = min_t(size_t, mbytes, @@ -884,6 +889,7 @@ static int kimage_load_crash_segment(struct kimage *image, result = copy_from_user(ptr, buf, uchunk); kexec_flush_icache_page(page); kunmap(page); + arch_kexec_pre_free_pages(page_address(page), 1); if (result) { result = -EFAULT; goto out; -- 2.20.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
