From: Lianbo Jiang Date: Sun, 30 Sep 2018 03:10:31 +0000 (+0800) Subject: kexec: Allocate decrypted control pages for kdump if SME is enabled X-Git-Tag: v5.15~7786^2~30 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9cf38d5559e813cccdba8b44c82cc46ba48d0896;p=platform%2Fkernel%2Flinux-starfive.git kexec: Allocate decrypted control pages for kdump if SME is enabled 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 Signed-off-by: Borislav Petkov Reviewed-by: Tom Lendacky Cc: kexec@lists.infradead.org Cc: tglx@linutronix.de Cc: mingo@redhat.com Cc: hpa@zytor.com Cc: akpm@linux-foundation.org Cc: dan.j.williams@intel.com Cc: bhelgaas@google.com Cc: baiyaowei@cmss.chinamobile.com Cc: tiwai@suse.de Cc: brijesh.singh@amd.com Cc: dyoung@redhat.com Cc: bhe@redhat.com Cc: jroedel@suse.de Link: https://lkml.kernel.org/r/20180930031033.22110-3-lijiang@redhat.com --- diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index 23a83a4..86ef06d 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -471,6 +471,10 @@ 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;