linux-kernel - [PATCH 2/2 v4] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo

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Message-Id: <20181220054044.30738-3-lijiang@redhat.com>
Date:   Thu, 20 Dec 2018 13:40:44 +0800
From:   Lianbo Jiang <lijiang@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     kexec@...ts.infradead.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, akpm@...ux-foundation.org,
        bhe@...hat.com, dyoung@...hat.com, linux-doc@...r.kernel.org
Subject: [PATCH 2/2 v4] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo

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@...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