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Date: Mon, 7 Jan 2019 10:29:25 +0800 From: Baoquan He <bhe@...hat.com> To: Lianbo Jiang <lijiang@...hat.com> Cc: linux-kernel@...r.kernel.org, kexec@...ts.infradead.org, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org, akpm@...ux-foundation.org, dyoung@...hat.com, linux-doc@...r.kernel.org, k-hagio@...jp.nec.com, anderson@...hat.com Subject: Re: [PATCH 2/2 v5] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo On 01/07/19 at 09:47am, 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 ^ crashed > in the first kernel, the crash kernel's page table(pgd/pud/pmd/pte) ^ crashed > contains the memory encryption mask, so need to remove the sme mask "makedumpfile needs" or in makedumpfile need to remove... > to obtain the true physical address. > > Signed-off-by: Lianbo Jiang <lijiang@...hat.com> > --- > arch/x86/kernel/machine_kexec_64.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c > index 4c8acdfdc5a7..bc4108096b18 100644 > --- a/arch/x86/kernel/machine_kexec_64.c > +++ b/arch/x86/kernel/machine_kexec_64.c > @@ -352,10 +352,13 @@ 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()); > + VMCOREINFO_NUMBER(sme_mask); > > #ifdef CONFIG_NUMA > VMCOREINFO_SYMBOL(node_data); > -- > 2.17.1 >
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