在 2018年12月17日 21:01, Borislav Petkov 写道:
> On Sun, Dec 16, 2018 at 09:16:17PM +0800, Lianbo Jiang wrote:
>> For AMD machine with SME feature, makedumpfile tools need to know
>> whether the crash kernel was encrypted or not. If SME is enabled
>> in the first kernel, the crash kernel's page table(pgd/pud/pmd/pte)
>> contains the memory encryption mask, so need to remove the sme mask
>> to obtain the true physical address.
>>
>> Signed-off-by: Lianbo Jiang <lijiang@xxxxxxxxxx>
>> ---
>> arch/x86/kernel/machine_kexec_64.c | 14 ++++++++++++++
>> 1 file changed, 14 insertions(+)
>>
>> diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
>> index 4c8acdfdc5a7..1860fe24117d 100644
>> --- a/arch/x86/kernel/machine_kexec_64.c
>> +++ b/arch/x86/kernel/machine_kexec_64.c
>> @@ -352,10 +352,24 @@ 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",
>> pgtable_l5_enabled());
>> + /*
>> + * Currently, the local variable 'sme_mask' stores the value of
>> + * sme_me_mask(bit 47), and also write the value of sme_mask to
>> + * the vmcoreinfo.
>> + * If need, the bit(sme_mask) might be redefined in the future,
>> + * but the 'bit63' will be reserved.
>> + * For example:
>> + * [ misc ][ enc bit ][ other misc SME info ]
>> + * 0000_0000_0000_0000_1000_0000_0000_0000_0000_0000_..._0000
>> + * 63 59 55 51 47 43 39 35 31 27 ... 3
>> + */
>
> This text belongs into the document.
>
Ok, i will move it into VMCOREINFO document.
Thanks.
