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[2003:cb:c70b:e100:38d6:8aa1:11b0:a20a]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-434d52a3139sm24274545e9.28.2024.12.04.04.55.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Dec 2024 04:55:14 -0800 (PST) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-s390@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, kexec@lists.infradead.org, David Hildenbrand , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Baoquan He , Vivek Goyal , Dave Young , Thomas Huth , Cornelia Huck , Janosch Frank , Claudio Imbrenda , Eric Farman , Andrew Morton Subject: [PATCH v2 10/12] virtio-mem: remember usable region size Date: Wed, 4 Dec 2024 13:54:41 +0100 Message-ID: <20241204125444.1734652-11-david@redhat.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241204125444.1734652-1-david@redhat.com> References: <20241204125444.1734652-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Let's remember the usable region size, which will be helpful in kdump mode next. Signed-off-by: David Hildenbrand --- 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; =20 /* 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 virti= o_mem *vm) static void virtio_mem_refresh_config(struct virtio_mem *vm) { const struct range pluggable_range =3D mhp_get_pluggable_range(true); - uint64_t new_plugged_size, usable_region_size, end_addr; + uint64_t new_plugged_size, end_addr; =20 /* 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_m= em *vm) =20 /* calculate the last usable memory block id */ virtio_cread_le(vm->vdev, struct virtio_mem_config, - usable_region_size, &usable_region_size); - end_addr =3D min(vm->addr + usable_region_size - 1, + usable_region_size, &vm->usable_region_size); + end_addr =3D min(vm->addr + vm->usable_region_size - 1, pluggable_range.end); =20 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); =20 /* Determine the nid for the device based on the lowest address. */ if (vm->nid =3D=3D NUMA_NO_NODE) --=20 2.47.1