diff options
| author | Lianbo Jiang <[email protected]> | 2019-01-10 20:19:44 +0800 |
|---|---|---|
| committer | Borislav Petkov <[email protected]> | 2019-01-11 16:09:25 +0100 |
| commit | 65f750e5457aef9a8085a99d613fea0430303e93 (patch) | |
| tree | 769aa2734a1b3d2a1ff296e4084d141d10168cdd | |
| parent | bfeffd155283772bbe78c6a05dec7c0128ee500c (diff) | |
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 <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
| -rw-r--r-- | arch/x86/kernel/machine_kexec_64.c | 3 |
1 files changed, 3 insertions, 0 deletions
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 */ |