Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio updates from Michael Tsirkin:
 "A small number of improvements all over the place:

   - vdpa/octeon support for multiple interrupts

   - virtio-pci support for error recovery

   - vp_vdpa support for notification with data

   - vhost/net fix to set num_buffers for spec compliance

   - virtio-mem now works with kdump on s390

  And small cleanups all over the place"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (23 commits)
  virtio_blk: Add support for transport error recovery
  virtio_pci: Add support for PCIe Function Level Reset
  vhost/net: Set num_buffers for virtio 1.0
  vdpa/octeon_ep: read vendor-specific PCI capability
  virtio-pci: define type and header for PCI vendor data
  vdpa/octeon_ep: handle device config change events
  vdpa/octeon_ep: enable support for multiple interrupts per device
  vdpa: solidrun: Replace deprecated PCI functions
  s390/kdump: virtio-mem kdump support (CONFIG_PROC_VMCORE_DEVICE_RAM)
  virtio-mem: support CONFIG_PROC_VMCORE_DEVICE_RAM
  virtio-mem: remember usable region size
  virtio-mem: mark device ready before registering callbacks in kdump mode
  fs/proc/vmcore: introduce PROC_VMCORE_DEVICE_RAM to detect device RAM ranges in 2nd kernel
  fs/proc/vmcore: factor out freeing a list of vmcore ranges
  fs/proc/vmcore: factor out allocating a vmcore range and adding it to a list
  fs/proc/vmcore: move vmcore definitions out of kcore.h
  fs/proc/vmcore: prefix all pr_* with "vmcore:"
  fs/proc/vmcore: disallow vmcore modifications while the vmcore is open
  fs/proc/vmcore: replace vmcoredd_mutex by vmcore_mutex
  fs/proc/vmcore: convert vmcore_cb_lock into vmcore_mutex
  ...

3 files changed, 49 insertions, 13 deletions

diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
index acc55626afdc..2f2555e6407c 100644
--- a/include/linux/crash_dump.h
+++ b/include/linux/crash_dump.h
@@ -20,6 +20,8 @@ extern int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size);
 extern void elfcorehdr_free(unsigned long long addr);
 extern ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos);
 extern ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos);
+void elfcorehdr_fill_device_ram_ptload_elf64(Elf64_Phdr *phdr,
+		unsigned long long paddr, unsigned long long size);
 extern int remap_oldmem_pfn_range(struct vm_area_struct *vma,
 				  unsigned long from, unsigned long pfn,
 				  unsigned long size, pgprot_t prot);
@@ -99,6 +101,12 @@ static inline void vmcore_unusable(void)
  *              indicated in the vmcore instead. For example, a ballooned page
  *              contains no data and reading from such a page will cause high
  *              load in the hypervisor.
+ * @get_device_ram: query RAM ranges that can only be detected by device
+ *   drivers, such as the virtio-mem driver, so they can be included in
+ *   the crash dump on architectures that allocate the elfcore hdr in the dump
+ *   ("2nd") kernel. Indicated RAM ranges may contain holes to reduce the
+ *   total number of ranges; such holes can be detected using the pfn_is_ram
+ *   callback just like for other RAM.
  * @next: List head to manage registered callbacks internally; initialized by
  *        register_vmcore_cb().
  *
@@ -109,11 +117,44 @@ static inline void vmcore_unusable(void)
  */
 struct vmcore_cb {
 	bool (*pfn_is_ram)(struct vmcore_cb *cb, unsigned long pfn);
+	int (*get_device_ram)(struct vmcore_cb *cb, struct list_head *list);
 	struct list_head next;
 };
 extern void register_vmcore_cb(struct vmcore_cb *cb);
 extern void unregister_vmcore_cb(struct vmcore_cb *cb);
 
+struct vmcore_range {
+	struct list_head list;
+	unsigned long long paddr;
+	unsigned long long size;
+	loff_t offset;
+};
+
+/* Allocate a vmcore range and add it to the list. */
+static inline int vmcore_alloc_add_range(struct list_head *list,
+		unsigned long long paddr, unsigned long long size)
+{
+	struct vmcore_range *m = kzalloc(sizeof(*m), GFP_KERNEL);
+
+	if (!m)
+		return -ENOMEM;
+	m->paddr = paddr;
+	m->size = size;
+	list_add_tail(&m->list, list);
+	return 0;
+}
+
+/* Free a list of vmcore ranges. */
+static inline void vmcore_free_ranges(struct list_head *list)
+{
+	struct vmcore_range *m, *tmp;
+
+	list_for_each_entry_safe(m, tmp, list, list) {
+		list_del(&m->list);
+		kfree(m);
+	}
+}
+
 #else /* !CONFIG_CRASH_DUMP */
 static inline bool is_kdump_kernel(void) { return false; }
 #endif /* CONFIG_CRASH_DUMP */
diff --git a/include/linux/kcore.h b/include/linux/kcore.h
index 86c0f1d18998..9a2fa013c91d 100644
--- a/include/linux/kcore.h
+++ b/include/linux/kcore.h
@@ -20,19 +20,6 @@ struct kcore_list {
 	int type;
 };
 
-struct vmcore {
-	struct list_head list;
-	unsigned long long paddr;
-	unsigned long long size;
-	loff_t offset;
-};
-
-struct vmcoredd_node {
-	struct list_head list;	/* List of dumps */
-	void *buf;		/* Buffer containing device's dump */
-	unsigned int size;	/* Size of the buffer */
-};
-
 #ifdef CONFIG_PROC_KCORE
 void __init kclist_add(struct kcore_list *, void *, size_t, int type);
 
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index dd88682e27e3..4d16c13d0df5 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -190,6 +190,8 @@ int virtio_device_freeze(struct virtio_device *dev);
 int virtio_device_restore(struct virtio_device *dev);
 #endif
 void virtio_reset_device(struct virtio_device *dev);
+int virtio_device_reset_prepare(struct virtio_device *dev);
+int virtio_device_reset_done(struct virtio_device *dev);
 
 size_t virtio_max_dma_size(const struct virtio_device *vdev);
 
@@ -214,6 +216,10 @@ size_t virtio_max_dma_size(const struct virtio_device *vdev);
  *    changes; may be called in interrupt context.
  * @freeze: optional function to call during suspend/hibernation.
  * @restore: optional function to call on resume.
+ * @reset_prepare: optional function to call when a transport specific reset
+ *    occurs.
+ * @reset_done: optional function to call after transport specific reset
+ *    operation has finished.
  */
 struct virtio_driver {
 	struct device_driver driver;
@@ -229,6 +235,8 @@ struct virtio_driver {
 	void (*config_changed)(struct virtio_device *dev);
 	int (*freeze)(struct virtio_device *dev);
 	int (*restore)(struct virtio_device *dev);
+	int (*reset_prepare)(struct virtio_device *dev);
+	int (*reset_done)(struct virtio_device *dev);
 };
 
 #define drv_to_virtio(__drv)	container_of_const(__drv, struct virtio_driver, driver)