linux-kernel - [PATCH v1 09/11] virtio-mem: remember usable region size

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Message-ID: <20241025151134.1275575-10-david@redhat.com>
Date: Fri, 25 Oct 2024 17:11:31 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	linux-s390@...r.kernel.org,
	virtualization@...ts.linux.dev,
	kvm@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	kexec@...ts.infradead.org,
	David Hildenbrand <david@...hat.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Baoquan He <bhe@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Dave Young <dyoung@...hat.com>,
	Thomas Huth <thuth@...hat.com>,
	Cornelia Huck <cohuck@...hat.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	Eric Farman <farman@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v1 09/11] virtio-mem: remember usable region size

Let's remember the usable region size, which will be helpful in kdump
mode next.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 drivers/virtio/virtio_mem.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 126f1d669bb0..73477d5b79cf 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -133,6 +133,8 @@ struct virtio_mem {
 	uint64_t addr;
 	/* Maximum region size in bytes. */
 	uint64_t region_size;
+	/* Usable region size in bytes. */
+	uint64_t usable_region_size;
 
 	/* The parent resource for all memory added via this device. */
 	struct resource *parent_resource;
@@ -2368,7 +2370,7 @@ static int virtio_mem_cleanup_pending_mb(struct virtio_mem *vm)
 static void virtio_mem_refresh_config(struct virtio_mem *vm)
 {
 	const struct range pluggable_range = mhp_get_pluggable_range(true);
-	uint64_t new_plugged_size, usable_region_size, end_addr;
+	uint64_t new_plugged_size, end_addr;
 
 	/* the plugged_size is just a reflection of what _we_ did previously */
 	virtio_cread_le(vm->vdev, struct virtio_mem_config, plugged_size,
@@ -2378,8 +2380,8 @@ 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 = min(vm->addr + usable_region_size - 1,
+			usable_region_size, &vm->usable_region_size);
+	end_addr = min(vm->addr + vm->usable_region_size - 1,
 		       pluggable_range.end);
 
 	if (vm->in_sbm) {
@@ -2763,6 +2765,8 @@ static int virtio_mem_init(struct virtio_mem *vm)
 	virtio_cread_le(vm->vdev, struct virtio_mem_config, addr, &vm->addr);
 	virtio_cread_le(vm->vdev, struct virtio_mem_config, region_size,
 			&vm->region_size);
+	virtio_cread_le(vm->vdev, struct virtio_mem_config, usable_region_size,
+			&vm->usable_region_size);
 
 	/* Determine the nid for the device based on the lowest address. */
 	if (vm->nid == NUMA_NO_NODE)
-- 
2.46.1