lkml.org 
[lkml]   [2018]   [Dec]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2 v4] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo
Date
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@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: 2018-12-20 06:41    [W:0.089 / U:0.356 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site