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From: Lianbo Jiang <lijiang@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: kexec@lists.infradead.org, tglx@linutronix.de, mingo@redhat.com,
	bp@alien8.de, x86@kernel.org, akpm@linux-foundation.org,
	bhe@redhat.com, dyoung@redhat.com, k-hagio@ab.jp.nec.com,
	anderson@redhat.com, linux-doc@vger.kernel.org
Subject: [PATCH 2/2 v6] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo
Date: Thu, 10 Jan 2019 20:19:44 +0800	[thread overview]
Message-ID: <20190110121944.6050-3-lijiang@redhat.com> (raw)
In-Reply-To: <20190110121944.6050-1-lijiang@redhat.com>

For AMD machine with SME feature, makedumpfile tools need to know
whether the crashed kernel was encrypted or not. If SME is enabled
in the first kernel, the crashed kernel's page table(pgd/pud/pmd/pte)
contains the memory encryption mask, so makedumpfile needs 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


WARNING: multiple messages have this Message-ID (diff)
From: Lianbo Jiang <lijiang@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: k-hagio@ab.jp.nec.com, bhe@redhat.com, linux-doc@vger.kernel.org,
	x86@kernel.org, kexec@lists.infradead.org, mingo@redhat.com,
	bp@alien8.de, anderson@redhat.com, tglx@linutronix.de,
	dyoung@redhat.com, akpm@linux-foundation.org
Subject: [PATCH 2/2 v6] kdump, vmcoreinfo: Export the value of sme mask to vmcoreinfo
Date: Thu, 10 Jan 2019 20:19:44 +0800	[thread overview]
Message-ID: <20190110121944.6050-3-lijiang@redhat.com> (raw)
In-Reply-To: <20190110121944.6050-1-lijiang@redhat.com>

For AMD machine with SME feature, makedumpfile tools need to know
whether the crashed kernel was encrypted or not. If SME is enabled
in the first kernel, the crashed kernel's page table(pgd/pud/pmd/pte)
contains the memory encryption mask, so makedumpfile needs 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


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  parent reply	other threads:[~2019-01-10 12:20 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-10 12:19 [PATCH 0/2 v6] kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo Lianbo Jiang
2019-01-10 12:19 ` [PATCH 0/2 v6] kdump, vmcoreinfo: " Lianbo Jiang
2019-01-10 12:19 ` [PATCH 1/2 v6] kdump: add the vmcoreinfo documentation Lianbo Jiang
2019-01-10 12:19   ` Lianbo Jiang
2019-01-11 12:33   ` Borislav Petkov
2019-01-11 12:33     ` Borislav Petkov
2019-01-14  1:52     ` lijiang
2019-01-14  1:52       ` lijiang
2019-01-14  9:10       ` Borislav Petkov
2019-01-14  9:10         ` Borislav Petkov
2019-01-14 17:48     ` Kazuhito Hagio
2019-01-14 17:48       ` Kazuhito Hagio
2019-01-14 18:01       ` Borislav Petkov
2019-01-14 18:01         ` Borislav Petkov
2019-01-14 18:58         ` Dave Anderson
2019-01-14 18:58           ` Dave Anderson
2019-01-14 19:21           ` Borislav Petkov
2019-01-14 19:21             ` Borislav Petkov
2019-01-14 19:36             ` Dave Anderson
2019-01-14 19:36               ` Dave Anderson
2019-01-14 19:59               ` Borislav Petkov
2019-01-14 19:59                 ` Borislav Petkov
2019-01-14 20:07                 ` Dave Anderson
2019-01-14 20:07                   ` Dave Anderson
2019-01-14 20:18                   ` Borislav Petkov
2019-01-14 20:18                     ` Borislav Petkov
2019-01-14 20:26                     ` Dave Anderson
2019-01-14 20:26                       ` Dave Anderson
2019-01-14 20:35                       ` Borislav Petkov
2019-01-14 20:35                         ` Borislav Petkov
2019-01-14 20:49                         ` Dave Anderson
2019-01-14 20:49                           ` Dave Anderson
2019-01-15 10:06                           ` Borislav Petkov
2019-01-15 10:06                             ` Borislav Petkov
2019-01-15 11:00                           ` lijiang
2019-01-15 11:00                             ` lijiang
2019-01-11 14:56   ` Borislav Petkov
2019-01-11 14:56     ` Borislav Petkov
2019-01-14  5:30     ` lijiang
2019-01-14  5:30       ` lijiang
2019-01-14  9:15       ` Borislav Petkov
2019-01-14  9:15         ` Borislav Petkov
2019-01-15  9:41         ` lijiang
2019-01-15  9:41           ` lijiang
2019-01-15 10:09   ` [tip:x86/kdump] kdump: Document kernel data exported in the vmcoreinfo note tip-bot for Lianbo Jiang
2019-01-10 12:19 ` Lianbo Jiang [this message]
2019-01-10 12:19   ` [PATCH 2/2 v6] kdump, vmcoreinfo: Export the value of sme mask to vmcoreinfo Lianbo Jiang
2019-01-11 15:15   ` [tip:x86/kdump] x86/kdump: Export the SME " tip-bot for Lianbo Jiang

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