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authorDavid Hildenbrand <david@redhat.com>2021-02-25 17:17:45 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-26 09:41:01 -0800
commit94c8945376d44b37aa3ab5b58669a2a86326968e (patch)
treed0ceadb78653a722fa5848d41c6e6b2faa894a55
parent7707248a4727c4e8ee8d84ed578a9807d8994a40 (diff)
virtio-mem: check against mhp_get_pluggable_range() which memory we can hotplug
Right now, we only check against MAX_PHYSMEM_BITS - but turns out there are more restrictions of which memory we can actually hotplug, especially om arm64 or s390x once we support them: we might receive something like -E2BIG or -ERANGE from add_memory_driver_managed(), stopping device operation. So, check right when initializing the device which memory we can add, warning the user. Try only adding actually pluggable ranges: in the worst case, no memory provided by our device is pluggable. In the usual case, we expect all device memory to be pluggable, and in corner cases only some memory at the end of the device-managed memory region to not be pluggable. Link: https://lkml.kernel.org/r/1612149902-7867-5-git-send-email-anshuman.khandual@arm.com Signed-off-by: David Hildenbrand <david@redhat.com> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: teawater <teawaterz@linux.alibaba.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Pankaj Gupta <pankaj.gupta@cloud.ionos.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/virtio/virtio_mem.c41
1 files changed, 27 insertions, 14 deletions
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index d44e43869f17..1119e0c6f6c1 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -2222,7 +2222,7 @@ static int virtio_mem_unplug_pending_mb(struct virtio_mem *vm)
*/
static void virtio_mem_refresh_config(struct virtio_mem *vm)
{
- const uint64_t phys_limit = 1UL << MAX_PHYSMEM_BITS;
+ const struct range pluggable_range = mhp_get_pluggable_range(true);
uint64_t new_plugged_size, usable_region_size, end_addr;
/* the plugged_size is just a reflection of what _we_ did previously */
@@ -2234,15 +2234,25 @@ static void virtio_mem_refresh_config(struct virtio_mem *vm)
/* calculate the last usable memory block id */
virtio_cread_le(vm->vdev, struct virtio_mem_config,
usable_region_size, &usable_region_size);
- end_addr = vm->addr + usable_region_size;
- end_addr = min(end_addr, phys_limit);
+ end_addr = min(vm->addr + usable_region_size - 1,
+ pluggable_range.end);
- if (vm->in_sbm)
- vm->sbm.last_usable_mb_id =
- virtio_mem_phys_to_mb_id(end_addr) - 1;
- else
- vm->bbm.last_usable_bb_id =
- virtio_mem_phys_to_bb_id(vm, end_addr) - 1;
+ if (vm->in_sbm) {
+ vm->sbm.last_usable_mb_id = virtio_mem_phys_to_mb_id(end_addr);
+ if (!IS_ALIGNED(end_addr + 1, memory_block_size_bytes()))
+ vm->sbm.last_usable_mb_id--;
+ } else {
+ vm->bbm.last_usable_bb_id = virtio_mem_phys_to_bb_id(vm,
+ end_addr);
+ if (!IS_ALIGNED(end_addr + 1, vm->bbm.bb_size))
+ vm->bbm.last_usable_bb_id--;
+ }
+ /*
+ * If we cannot plug any of our device memory (e.g., nothing in the
+ * usable region is addressable), the last usable memory block id will
+ * be smaller than the first usable memory block id. We'll stop
+ * attempting to add memory with -ENOSPC from our main loop.
+ */
/* see if there is a request to change the size */
virtio_cread_le(vm->vdev, struct virtio_mem_config, requested_size,
@@ -2364,7 +2374,7 @@ static int virtio_mem_init_vq(struct virtio_mem *vm)
static int virtio_mem_init(struct virtio_mem *vm)
{
- const uint64_t phys_limit = 1UL << MAX_PHYSMEM_BITS;
+ const struct range pluggable_range = mhp_get_pluggable_range(true);
uint64_t sb_size, addr;
uint16_t node_id;
@@ -2405,9 +2415,10 @@ static int virtio_mem_init(struct virtio_mem *vm)
if (!IS_ALIGNED(vm->addr + vm->region_size, memory_block_size_bytes()))
dev_warn(&vm->vdev->dev,
"The alignment of the physical end address can make some memory unusable.\n");
- if (vm->addr + vm->region_size > phys_limit)
+ if (vm->addr < pluggable_range.start ||
+ vm->addr + vm->region_size - 1 > pluggable_range.end)
dev_warn(&vm->vdev->dev,
- "Some memory is not addressable. This can make some memory unusable.\n");
+ "Some device memory is not addressable/pluggable. This can make some memory unusable.\n");
/*
* We want subblocks to span at least MAX_ORDER_NR_PAGES and
@@ -2429,7 +2440,8 @@ static int virtio_mem_init(struct virtio_mem *vm)
vm->sbm.sb_size;
/* Round up to the next full memory block */
- addr = vm->addr + memory_block_size_bytes() - 1;
+ addr = max_t(uint64_t, vm->addr, pluggable_range.start) +
+ memory_block_size_bytes() - 1;
vm->sbm.first_mb_id = virtio_mem_phys_to_mb_id(addr);
vm->sbm.next_mb_id = vm->sbm.first_mb_id;
} else {
@@ -2450,7 +2462,8 @@ static int virtio_mem_init(struct virtio_mem *vm)
}
/* Round up to the next aligned big block */
- addr = vm->addr + vm->bbm.bb_size - 1;
+ addr = max_t(uint64_t, vm->addr, pluggable_range.start) +
+ vm->bbm.bb_size - 1;
vm->bbm.first_bb_id = virtio_mem_phys_to_bb_id(vm, addr);
vm->bbm.next_bb_id = vm->bbm.first_bb_id;
}