lkml.org 
[lkml]   [2019]   [Jan]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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@redhat.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
>

\
 
 \ /
  Last update: 2019-01-07 03:30    [W:0.056 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site