Document how to enable GPU and PAYG for CRN operator (#139)

* Document how to enable GPU and PAYG for CRN operator

* List supported chain in faq

docs/faq.md

@@ -104,7 +104,7 @@ Twentysix Cloud is a cross-chain cloud solution that provides scalable, high-per
 Purchase ALEPH v2 on platforms such as Coinbase, KuCoin, Gate, LATOKEN, MEXC, Uniswap (Ethereum), Pancakeswap (BNB Chain), TraderJoe (Avalanche), and Raydium (Solana).
 
 ### What is Pay-As-You-Go?
-Pay-As-You-Go allows you to pay for resources as you use them on the Aleph.im network, eliminating the need to hold or stake large amounts of $ALEPH. This is currently available only on the Avalanche c-chain.
+Pay-As-You-Go allows you to pay for resources as you use them on the Aleph.im network, eliminating the need to hold or stake large amounts of $ALEPH. This is currently available  on BASE and Avalanche c-chain. More chains will be supported in the future, refer to the [supported chains](protocol/chains.md) table.
 
 ## III. Node Operators
 

docs/nodes/compute/advanced/enable-confidential.md

@@ -1,4 +1,4 @@
-# Confidential computing
+# Enable Confidential computing
 
 This guide outlines how to enable [Confidential Computing](../../../computing/confidential/index.md) on a CRN.
 

docs/nodes/compute/advanced/enable-gpu.md

@@ -0,0 +1,125 @@
+# Enabling GPU support
+
+This guide outlines how to enable GPU support on your CRN, as to allow user do deploy Instance with GPUs.
+
+Enabling GPU support for Virtualization requires changing which Kernel module (driver) is handling the GPU card, as it need the special `vfio` module to works with qemu. Do note that it will make the GPU unavailable for other purposes.
+
+To activate this feature it is also required to enable PAYG support and IPv6 on your CRN, as this is the required payment method for GPU. Follow the steps at [Enable PAYG](enable-payg.md)
+
+## Device compatible with the feature
+
+At the time of writing the GPUs listed below are compatible with the feature, more will be added soon as they are tested and validated.
+
+### Standard GPUs
+
+| GPU Model    | vCPU | RAM   | vRAM  | Price approx    |
+|--------------|------|-------|-------|-----------------|
+| L40S         | 12   | 72 GB | 48 GB | 3.33 ALEPH/hour |
+| RTX 5090     | 8    | 48 GB | 36 GB | 2.24 ALEPH/hour |
+| RTX 4090     | 6    | 36 GB | 24 GB | 1.68 ALEPH/hour |
+| RTX 3090     | 4    | 24 GB | 24 GB | 1.12 ALEPH/hour |
+| RTX 4000 ADA | 3    | 18 GB | 20 GB | 0.84 ALEPH/hour |
+
+GPUs must be connected via PCIe 4.0 16x each.
+
+## Premium GPUs
+
+
+Datacenter grade GPUs.
+
+| GPU Model | vCPU | RAM    | vRAM  | Price approx     |
+|-----------|------|--------|-------|------------------|
+| H100      | 24   | 144 GB | 80 GB | 13.33 ALEPH/hour |
+| A100      | 16   | 96 GB  | 80 GB | 8.89  ALEPH/hour |
+
+## Switch Kernel modules for GPU
+It is possible to enable multiple GPUs on one CRN
+
+Execute these command as root, use `sudo` on Ubuntu system. 
+
+1. Edit initramfs to attach GPU to vfio:
+   `vi /etc/initramfs-tools/modules` and set the content to 
+```
+attach : vfio vfio_iommu_type1 vfio_virqfd vfio_pci ids=10de:27b0,10de:22bc
+```
+
+replacing the ids `10de:27b0,10de:22bc` with ids of the VGA card, there should be 2, the Video device and the GPU audio device.
+You can get them running `lspci -nvv` as root user. 
+
+2. Edit `/etc/modules` to ensure that lods GPU to vfio:
+`vi /etc/modules` and add
+```
+attach: vfio vfio_iommu_type1 vfio_pci ids=10de:27b0,10de:22bc
+```
+
+3. Modify nvidia drivers to load after the vfio:
+`vi /etc/modprobe.d/nvidia.conf`
+
+set
+```
+softdep nouveau pre: vfio-pci
+softdep nvidia pre: vfio-pci
+softdep nvidia* pre: vfio-pci
+```
+
+4. Get the know alias from the PCI device:
+`cat /sys/bus/pci/devices/0000:01:00.0/modalias`
+replace pci address  `0000:01:00.0` with the one for your GPU, you can get it using `lspci` 
+
+5. Configure vfio module to use that devices:
+`vi /etc/modprobe.d/vfio.conf`
+
+```
+blacklist nouveau
+blacklist snd_hda_intel
+alias pci:v000010DEd000027B0sv000010DEsd000016FAbc03sc00i00 vfio-pci
+options vfio-pci ids=10de:27b0,10de:22bc
+```
+
+6. Enable modprobe vfio-pci
+```
+modprobe vfio-pci
+```
+
+7 . Update initramfs image with your changes:
+```shell
+update-initramfs -u -k all
+```
+
+8. Finally Reboot the server
+```shell
+reboot
+```
+
+9. Confirm that the `vfio-pci` kernel module is used for the card
+```shell
+lspci -k
+```
+
+Should display something similar to
+```
+[...]
+01:00.0 VGA compatible controller: NVIDIA Corporation AD104GL [RTX 4000 SFF Ada Generation] (rev a1)
+	Subsystem: NVIDIA Corporation AD104GL [RTX 4000 SFF Ada Generation]
+	Kernel driver in use: vfio-pci
+	Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia
+01:00.1 Audio device: NVIDIA Corporation Device 22bc (rev a1)
+	Subsystem: NVIDIA Corporation Device 16fa
+	Kernel driver in use: vfio-pci
+	Kernel modules: snd_hda_intel
+[...]
+```
+
+10. Confirm that the GPU are listed and supported on the CRN index page
+No additional modification is needed inside the aleph-vm configuration, apart from [enabling PAYG](./enable-payg.md).
+
+Start your aleph-vm supervisor, open the index page and it should list your GPU
+```
+GPUs
+
+   • NVIDIA | AD104GL [RTX 4000 SFF Ada Generation] is compatible ✅
+```
+
+
+## Disabling support.
+To disable support for the GPU, revert the modification done to attach the kernel module to the GPU.

docs/nodes/compute/advanced/enable-payg.md

@@ -0,0 +1,22 @@
+## Enable PAYG (Pay-As-You-Go)
+
+Pay-As-You-Go allows user to pay for resources as you use them on the Aleph.im network, eliminating the need to hold or
+stake large amounts of $ALEPH.
+
+The feature is currently available on BASE and Avalanche c-chain.
+
+This guide outlines how to enable [Confidential Computing](../../../computing/confidential/index.md) on a CRN.
+
+#### Configure the stream reward address
+
+1. Create an Avalanche (AVAX) or BASE wallet.
+2. Open the information of your CRN on the [aleph.im account page](https://account.aleph.im/) and enter the address in
+   the section named STREAM REWARD ADDRESS.
+
+3. Add the reward address inside the CRN configuration `/etc/aleph-vm/supervisor.env` in the form of:
+   ```
+   ALEPH_VM_PAYMENT_RECEIVER_ADDRESS="0x0000000000000000000000000000000000000000"
+   ```
+   Where `0x0000000000000000000000000000000000000000` is the address of your wallet.
+4. Restart the node with `systemctl restart aleph-vm-supervisor.service`
+5. Confirm that the address appears on the path `/status/config` on the CRN's URL/config

mkdocs.yml

@@ -75,7 +75,9 @@ nav:
         - 'Ubuntu 22.04': nodes/compute/installation/ubuntu-22.04.md
         - 'Ubuntu 24.04': nodes/compute/installation/ubuntu-24.04.md
         - 'Troubleshooting': nodes/compute/troubleshooting.md
-        - 'Confidential computing': nodes/compute/advanced/enable-confidential.md
+        - 'Enable PAYG': nodes/compute/advanced/enable-payg.md
+        - 'Enable Confidential computing': nodes/compute/advanced/enable-confidential.md
+        - 'Enable GPU support': nodes/compute/advanced/enable-gpu.md
       - 'Releases': nodes/compute/releases.md
     - 'Reliability':
       - 'Introduction': nodes/reliability/index.md