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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, linux-nvdimm@lists.01.org,
	kexec@lists.infradead.org,
	Pavel Tatashin <pasha.tatashin@soleen.com>,
	David Hildenbrand <david@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>,
	Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
	Wei Yang <richard.weiyang@gmail.com>, Baoquan He <bhe@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Eric Biederman <ebiederm@xmission.com>
Subject: [PATCH v4 3/4] kexec_file: Don't place kexec images on IORESOURCE_MEM_DRIVER_MANAGED
Date: Fri,  8 May 2020 10:42:16 +0200	[thread overview]
Message-ID: <20200508084217.9160-4-david@redhat.com> (raw)
In-Reply-To: <20200508084217.9160-1-david@redhat.com>

Memory flagged with IORESOURCE_MEM_DRIVER_MANAGED is special - it won't be
part of the initial memmap of the kexec kernel and not all memory might be
accessible. Don't place any kexec images onto it.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 kernel/kexec_file.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index faa74d5f6941..bb05fd52de85 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -540,6 +540,11 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
 	unsigned long sz = end - start + 1;
 
 	/* Returning 0 will take to next memory range */
+
+	/* Don't use memory that will be detected and handled by a driver. */
+	if (res->flags & IORESOURCE_MEM_DRIVER_MANAGED)
+		return 0;
+
 	if (sz < kbuf->memsz)
 		return 0;
 
-- 
2.25.4
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To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

WARNING: multiple messages have this Message-ID (diff)
From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, linux-nvdimm@lists.01.org,
	kexec@lists.infradead.org,
	Vishal Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Pavel Tatashin <pasha.tatashin@soleen.com>,
	David Hildenbrand <david@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>,
	Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
	Wei Yang <richard.weiyang@gmail.com>, Baoquan He <bhe@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Eric Biederman <ebiederm@xmission.com>,
	Dan Williams <dan.j.williams@intel.com>
Subject: [PATCH v4 3/4] kexec_file: Don't place kexec images on IORESOURCE_MEM_DRIVER_MANAGED
Date: Fri,  8 May 2020 10:42:16 +0200	[thread overview]
Message-ID: <20200508084217.9160-4-david@redhat.com> (raw)
In-Reply-To: <20200508084217.9160-1-david@redhat.com>

Memory flagged with IORESOURCE_MEM_DRIVER_MANAGED is special - it won't be
part of the initial memmap of the kexec kernel and not all memory might be
accessible. Don't place any kexec images onto it.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 kernel/kexec_file.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index faa74d5f6941..bb05fd52de85 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -540,6 +540,11 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
 	unsigned long sz = end - start + 1;
 
 	/* Returning 0 will take to next memory range */
+
+	/* Don't use memory that will be detected and handled by a driver. */
+	if (res->flags & IORESOURCE_MEM_DRIVER_MANAGED)
+		return 0;
+
 	if (sz < kbuf->memsz)
 		return 0;
 
-- 
2.25.4


WARNING: multiple messages have this Message-ID (diff)
From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
	Michal Hocko <mhocko@suse.com>, Dave Jiang <dave.jiang@intel.com>,
	Pavel Tatashin <pasha.tatashin@soleen.com>,
	Baoquan He <bhe@redhat.com>,
	linux-nvdimm@lists.01.org,
	Vishal Verma <vishal.l.verma@intel.com>,
	David Hildenbrand <david@redhat.com>,
	kexec@lists.infradead.org, Wei Yang <richard.weiyang@gmail.com>,
	linux-mm@kvack.org, Dave Hansen <dave.hansen@linux.intel.com>,
	Eric Biederman <ebiederm@xmission.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Williams <dan.j.williams@intel.com>
Subject: [PATCH v4 3/4] kexec_file: Don't place kexec images on IORESOURCE_MEM_DRIVER_MANAGED
Date: Fri,  8 May 2020 10:42:16 +0200	[thread overview]
Message-ID: <20200508084217.9160-4-david@redhat.com> (raw)
In-Reply-To: <20200508084217.9160-1-david@redhat.com>

Memory flagged with IORESOURCE_MEM_DRIVER_MANAGED is special - it won't be
part of the initial memmap of the kexec kernel and not all memory might be
accessible. Don't place any kexec images onto it.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 kernel/kexec_file.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index faa74d5f6941..bb05fd52de85 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -540,6 +540,11 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
 	unsigned long sz = end - start + 1;
 
 	/* Returning 0 will take to next memory range */
+
+	/* Don't use memory that will be detected and handled by a driver. */
+	if (res->flags & IORESOURCE_MEM_DRIVER_MANAGED)
+		return 0;
+
 	if (sz < kbuf->memsz)
 		return 0;
 
-- 
2.25.4


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

  parent reply	other threads:[~2020-05-08  8:42 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-08  8:42 [PATCH v4 0/4] mm/memory_hotplug: Interface to add driver-managed system ram David Hildenbrand
2020-05-08  8:42 ` David Hildenbrand
2020-05-08  8:42 ` David Hildenbrand
2020-05-08  8:42 ` [PATCH v4 1/4] device-dax: Don't leak kernel memory to user space after unloading kmem David Hildenbrand
2020-05-08  8:42   ` David Hildenbrand
2020-05-08  8:42   ` David Hildenbrand
2020-05-08 23:53   ` Andrew Morton
2020-05-08 23:53     ` Andrew Morton
2020-05-08 23:53     ` Andrew Morton
2020-05-09  5:40     ` David Hildenbrand
2020-05-09  5:40       ` David Hildenbrand
2020-05-09  5:40       ` David Hildenbrand
2020-05-08  8:42 ` [PATCH v4 2/4] mm/memory_hotplug: Introduce add_memory_driver_managed() David Hildenbrand
2020-05-08  8:42   ` David Hildenbrand
2020-05-08  8:42   ` David Hildenbrand
2020-05-08  8:42 ` David Hildenbrand [this message]
2020-05-08  8:42   ` [PATCH v4 3/4] kexec_file: Don't place kexec images on IORESOURCE_MEM_DRIVER_MANAGED David Hildenbrand
2020-05-08  8:42   ` David Hildenbrand
2020-05-08  8:42 ` [PATCH v4 4/4] device-dax: Add memory via add_memory_driver_managed() David Hildenbrand
2020-05-08  8:42   ` David Hildenbrand
2020-05-08  8:42   ` David Hildenbrand

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