# KVMX Documentation
-Misc documentation on kvmx and qemu.
+Misc documentation on kvmx and QEMU.
## USB hotplug support
* Image resize action, doing something like this, thanks to
https://ahelpme.com/linux/online-resize-of-a-root-ext4-file-system-increase-the-space/
- # poweroff
- kvmx poweroff $guest
+ # poweroff
+ kvmx poweroff $guest
- # resize image
- qemu-img resize `kvmx list_image $guest` +5G
+ # resize image
+ qemu-img resize `kvmx list_image $guest` +5G
- # power up
- kvmx up $guest
+ # power up
+ kvmx up $guest
- # ensure parted is installed
- #sudo apt-get install -y parted
- kvmx ssh $guest sudo apt-get install -y cloud-guest-utils
+ # ensure parted is installed
+ #sudo apt-get install -y parted
+ kvmx ssh $guest sudo apt-get install -y cloud-guest-utils
- # resize virtual machine root fs - while the partition is mounted!
- # this parted command currently need to be done manually
- #echo resizepart 2 -1 | kvmx ssh $guest sudo parted /dev/vda
+ # resize virtual machine root fs - while the partition is mounted!
+ # this parted command currently need to be done manually
+ #echo resizepart 2 -1 | kvmx ssh $guest sudo parted /dev/vda
- # See https://unix.stackexchange.com/questions/373063/auto-expand-last-partition-to-use-all-unallocated-space-using-parted-in-batch-m
- # https://unix.stackexchange.com/questions/190317/gnu-parted-resizepart-in-script#202872
- # https://bugs.launchpad.net/ubuntu/+source/parted/+bug/1270203
- # https://techtitbits.com/2018/12/using-parteds-resizepart-non-interactively-on-a-busy-partition/
- # https://serverfault.com/questions/870594/resize-partition-to-maximum-using-parted-in-non-interactive-mode
- #kvmx ssh $guest sudo parted /dev/vda resizepart 2 -1 Yes
- kvmx ssh $guest sudo growpart /dev/vda 2
+ # See https://unix.stackexchange.com/questions/373063/auto-expand-last-partition-to-use-all-unallocated-space-using-parted-in-batch-m
+ # https://unix.stackexchange.com/questions/190317/gnu-parted-resizepart-in-script#202872
+ # https://bugs.launchpad.net/ubuntu/+source/parted/+bug/1270203
+ # https://techtitbits.com/2018/12/using-parteds-resizepart-non-interactively-on-a-busy-partition/
+ # https://serverfault.com/questions/870594/resize-partition-to-maximum-using-parted-in-non-interactive-mode
+ #kvmx ssh $guest sudo parted /dev/vda resizepart 2 -1 Yes
+ kvmx ssh $guest sudo growpart /dev/vda 2
- kvmx ssh $guest sudo resize2fs /dev/vda2
- kvmx ssh $guest sudo touch /forcefsck
- kvmx restart $guest
+ kvmx ssh $guest sudo resize2fs /dev/vda2
+ kvmx ssh $guest sudo touch /forcefsck
+ kvmx restart $guest
## Folder sharing
-Some references on 9p folder sharing, especially regarding performance:
+### With virtio and 9p
+
+References on virtio:
+
+* [Virtio on Linux — The Linux Kernel documentation](https://www.kernel.org/doc/html/v6.8/driver-api/virtio/virtio.html)
+ * [linux kernel - VIRTIO: How it increase performance - Stack Overflow](https://stackoverflow.com/questions/24737882/virtio-how-it-increase-performance)
+ * [Virtual I/O Device (VIRTIO) Version 1.1](https://docs.oasis-open.org/virtio/virtio/v1.1/cs01/virtio-v1.1-cs01.html#x1-240006)
+
+Some references on 9p folder sharing:
* [v9fs: Plan 9 Resource Sharing for Linux — The Linux Kernel documentation](https://www.kernel.org/doc/html/latest/filesystems/9p.html)
* [Documentation/9p - QEMU](https://wiki.qemu.org/Documentation/9p)
* [Documentation/9psetup - QEMU](https://wiki.qemu.org/Documentation/9psetup)
* [v9fs · GitHub](https://github.com/v9fs)
- * [Virtio on Linux — The Linux Kernel documentation](https://www.kernel.org/doc/html/v6.8/driver-api/virtio/virtio.html)
- * [linux kernel - VIRTIO: How it increase performance - Stack Overflow](https://stackoverflow.com/questions/24737882/virtio-how-it-increase-performance)
- * [[Virtio-fs] [PATCH v2 0/3] virtio: increase VIRTQUEUE_MAX_SIZE to 32k](https://listman.redhat.com/archives/virtio-fs/2021-October/004135.html)
- * [Virtual I/O Device (VIRTIO) Version 1.1](https://docs.oasis-open.org/virtio/virtio/v1.1/cs01/virtio-v1.1-cs01.html#x1-240006)
- * [remove msize limit in virtio transport [LWN.net]](https://lwn.net/Articles/901523/)
- * [Performance fixes for 9p filesystem [LWN.net]](https://lwn.net/Articles/918213/)
- * [New Patches Aim To Boost Linux 9p Performance By ~10x - Phoronix](https://www.phoronix.com/news/Linux-9p-10x-Performance)
- * [9p performance increase by ~10x reflected in WSL? · microsoft/WSL · Discussion #9412 · GitHub](https://github.com/microsoft/WSL/discussions/9412)
- * [VM: 9p: degraded performance: a reasonable high msize should be chosen on client/guest side · Issue #10219 · canonical/lxd · GitHub](https://github.com/canonical/lxd/issues/10219)
- * [Add msize configuration for windows-side 9P client (=higher WSL2 disk speed) · Issue #9125 · microsoft/WSL · GitHub](https://github.com/microsoft/WSL/issues/9125)
- * [[PATCH v2 00/10] Performance fixes for 9p filesystem - Eric Van Hensbergen](https://lore.kernel.org/lkml/20221218232217.1713283-1-evanhensbergen@icloud.com/)
- * [linux/net/9p/client.c at master · torvalds/linux · GitHub](https://github.com/torvalds/linux/blob/master/net/9p/client.c)
- * [linux/net/9p/trans_virtio.c at master · torvalds/linux · GitHub](https://github.com/torvalds/linux/blob/master/net/9p/trans_virtio.c)
- * [History for net/9p/trans_virtio.c - torvalds/linux · GitHub](https://github.com/torvalds/linux/commits/master/net/9p/trans_virtio.c)
- * [Re: [PATCH v5 00/11] remove msize limit in virtio transport - Dominique Martinet](https://lore.kernel.org/all/Ys3j7KucZGdFkttA@codewreck.org/)
- * [[v4,08/12] net/9p: limit 'msize' to KMALLOC_MAX_SIZE for all transports - Patchwork](https://patchwork.kernel.org/project/netdevbpf/patch/39f81db5e5b25a1e4f94ad3b05552044209aff21.1640870037.git.linux_oss@crudebyte.com/)
+
+Performance limitations:
+
+* [linux/net/9p/trans_virtio.c at master · torvalds/linux · GitHub](https://github.com/torvalds/linux/blob/master/net/9p/trans_virtio.c)
+ * [linux/net/9p/trans_virtio.c at master - L803 · torvalds/linux · GitHub](https://github.com/torvalds/linux/blob/master/net/9p/trans_virtio.c#L803)
+ * [History for net/9p/trans_virtio.c - torvalds/linux · GitHub](https://github.com/torvalds/linux/commits/master/net/9p/trans_virtio.c)
+* [Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performan](https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg06343.html)
+ * [Re: Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p perfo](https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg06850.html)
+
+Discussion an proposals to overcome this limit:
+
+* [remove msize limit in virtio transport - LWN.net](https://lwn.net/Articles/901523/)
+ * [New Patches Aim To Boost Linux 9p Performance By ~10x - Phoronix](https://www.phoronix.com/news/Linux-9p-10x-Performance)
+ * [9p performance increase by ~10x reflected in WSL? · microsoft/WSL · Discussion #9412 · GitHub](https://github.com/microsoft/WSL/discussions/9412)
+ * [VM: 9p: degraded performance: a reasonable high msize should be chosen on client/guest side · Issue #10219 · canonical/lxd · GitHub](https://github.com/canonical/lxd/issues/10219)
+ * [Add msize configuration for windows-side 9P client (=higher WSL2 disk speed) · Issue #9125 · microsoft/WSL · GitHub](https://github.com/microsoft/WSL/issues/9125)
+ * [[Virtio-fs] Can not set high msize with virtio-9p (Was: Re: virtiofs vs 9p performance)](https://listman.redhat.com/archives/virtio-fs/2021-March/002811.html)
+
+Patches:
+
+* [[PATCH v6 00/11] remove msize limit in virtio transport [LWN.net]](https://lwn.net/ml/linux-kernel/cover.1657920926.git.linux_oss@crudebyte.com/)
+* [[PATCH v5 00/11] remove msize limit in virtio transport - Christian Schoenebeck](https://lore.kernel.org/all/cover.1657636554.git.linux_oss@crudebyte.com/)
+* [Performance fixes for 9p filesystem - LWN.net](https://lwn.net/Articles/918213/)
+* Other (untriaged list):
+ * [Re: [PATCH v5 00/11] remove msize limit in virtio transport - Christian Schoenebeck](https://lore.kernel.org/all/7468612.NupLhYsxyy@silver/)
+ * [[PATCH v3 0/7] net/9p: remove msize limit in virtio transport - Christian Schoenebeck](https://lore.kernel.org/netdev/cover.1632327421.git.linux_oss@crudebyte.com/)
+ * [[PATCH v2 1/7] net/9p: show error message if user 'msize' cannot be satisfied — Netdev](https://www.spinics.net/lists/netdev/msg768036.html)
+ * [[PATCH v2 00/10] Performance fixes for 9p filesystem - Eric Van Hensbergen](https://lore.kernel.org/lkml/20221218232217.1713283-1-evanhensbergen@icloud.com/)
+ * [[Virtio-fs] [PATCH v2 0/3] virtio: increase VIRTQUEUE_MAX_SIZE to 32k](https://listman.redhat.com/archives/virtio-fs/2021-October/004135.html)
+ * [[v4,08/12] net/9p: limit 'msize' to KMALLOC_MAX_SIZE for all transports - Patchwork](https://patchwork.kernel.org/project/netdevbpf/patch/39f81db5e5b25a1e4f94ad3b05552044209aff21.1640870037.git.linux_oss@crudebyte.com/)
+ * [Thread: [V9fs-developer] [PATCH] Improve 9p performance for read operations | Plan 9 Resource Sharing for Linux](https://sourceforge.net/p/v9fs/mailman/v9fs-developer/thread/B272E6A0-C349-4B23-BE6F-7CBA8D6C4B6B%40icloud.com/)
+
+### With virtiofs
+
+* [virtiofs - shared file system for virtual machines](https://virtio-fs.gitlab.io/)
+ * [virtiofs - shared file system for virtual machines / Standalone usage](https://virtio-fs.gitlab.io/howto-qemu.html)
+ * [Debian -- Details of package virtiofsd in trixie](https://packages.debian.org/trixie/virtiofsd)
+ * [rust-virtiofsd - Debian Package Tracker](https://tracker.debian.org/pkg/rust-virtiofsd)
+ * [libvirt: Sharing files with Virtiofs](https://libvirt.org/kbase/virtiofs.html)
+ * [virtio-fs / virtiofsd · GitLab](https://gitlab.com/virtio-fs/virtiofsd)
+ * [VirtIO-FS Is Looking Quite Good For Shared File-System With VMs - Phoronix](https://www.phoronix.com/news/VirtIO-FS-Looking-Good-2020)
projects / kvmx.git / commitdiff