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kexec: Allocate decrypted control pages for kdump if SME is enabled

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[ Upstream commit 9cf38d5559 ]

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 <lijiang@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lianbo Jiang 2018-09-30 11:10:31 +08:00 committed by Greg Kroah-Hartman
parent d26bd1ce5d
commit 0c43276429
1 changed files with 6 additions and 0 deletions
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6
kernel/kexec_core.c
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@ -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;