chore(docs): declare support for Granite Rapids CPUs

Update `README.md` and `CHANGELOG.md` to declare support for Granite
Rapids CPUs (8th Gen Intel EC2 instances).

Signed-off-by: James Curtis <jxcurtis@amazon.co.uk>

Author: JamesC1305

CHANGELOG.md

@@ -33,6 +33,13 @@ and this project adheres to
   guest synchronize its clocks. More information can be found in
   [docs](docs/snapshotting/snapshot-support.md#userspace-notifications-of-loading-virtual-machine-snapshots).
 
+- [#5574](https://github.com/firecracker-microvm/firecracker/pull/5574),
+  [#5671](https://github.com/firecracker-microvm/firecracker/pull/5671),
+  [#5674](https://github.com/firecracker-microvm/firecracker/pull/5674)
+  [#5690](https://github.com/firecracker-microvm/firecracker/pull/5690) Added
+  Intel Granite Rapids as a supported and tested platform for Firecracker on 6.1
+  host kernel versions.
+
 ### Changed
 
 - [#5564](https://github.com/firecracker-microvm/firecracker/pull/5564): which
@@ -503,7 +510,7 @@ and this project adheres to
 - [#4578](https://github.com/firecracker-microvm/firecracker/pull/4578): Fix
   UFFD support not being forward-compatible with new ioctl options introduced in
   Linux 6.6. See also
-  https://github.com/bytecodealliance/userfaultfd-rs/issues/61.
+  <https://github.com/bytecodealliance/userfaultfd-rs/issues/61>.
 - [#4618](https://github.com/firecracker-microvm/firecracker/pull/4618): On
   x86_64, when taking a snapshot, if a vCPU has MSR_IA32_TSC_DEADLINE set to 0,
   Firecracker will replace it with the MSR_IA32_TSC value from the same vCPU.
@@ -517,7 +524,7 @@ and this project adheres to
   `MSR_IA32_TSC_DEADLINE`. This fixed guests using the `TSC_DEADLINE` hardware
   feature receiving incorrect timer interrupts after snapshot restoration, which
   could lead to them seemingly getting stuck in sleep-related syscalls (see also
-  https://github.com/firecracker-microvm/firecracker/pull/4099).
+  <https://github.com/firecracker-microvm/firecracker/pull/4099>).
 
 ## [1.7.0]
 
@@ -670,7 +677,7 @@ and this project adheres to
 - [#4261](https://github.com/firecracker-microvm/firecracker/pull/4261): Fixed a
   bug where Firecracker would log "RunWithApiError error: MicroVMStopped without
   an error: GenericError" when exiting after encountering an emulation error. It
-  now correctly prints "RunWithApiError error: MicroVMStopped *with* an error:
+  now correctly prints "RunWithApiError error: MicroVMStopped _with_ an error:
   GenericError".
 - [#4242](https://github.com/firecracker-microvm/firecracker/pull/4242): Fixed a
   bug introduced in #4047 that limited the `--level` option of logger to
@@ -1582,7 +1589,7 @@ and this project adheres to
 - The boot source is specified only with the `kernel_image_path` and the
   optional parameter `boot_args`. All other fields are removed.
 - The `path_on_host` property in the drive specification is now marked as
-  *mandatory*.
+  _mandatory_.
 - PATCH drive only allows patching/changing the `path_on_host` property.
 - All PUT and PATCH requests return the status code 204.
 - CPUID brand string (aka model name) now includes the host CPU frequency.

README.md

@@ -132,18 +132,23 @@ The **API endpoint** can be used to:
 
 We test all combinations of:
 
-| Instance                               | Host OS & Kernel | Guest Rootfs | Guest Kernel |
-| :------------------------------------- | :--------------- | :----------- | :----------- |
-| m5n.metal (Intel Cascade Lake)         | al2 linux_5.10   | ubuntu 24.04 | linux_5.10   |
-| m6i.metal (Intel Ice Lake)             | al2023 linux_6.1 |              | linux_6.1    |
-| m7i.metal-24xl (Intel Sapphire Rapids) |                  |              |              |
-| m7i.metal-48xl (Intel Sapphire Rapids) |                  |              |              |
-| m6a.metal (AMD Milan)                  |                  |              |              |
-| m7a.metal-48xl (AMD Genoa)             |                  |              |              |
-| m6g.metal (Graviton 2)                 |                  |              |              |
-| m7g.metal (Graviton 3)                 |                  |              |              |
-| m8g.metal-24xl (Graviton 4)            |                  |              |              |
-| m8g.metal-48xl (Graviton 4)            |                  |              |              |
+| Instance                                    | Host OS & Kernel | Guest Rootfs | Guest Kernel |
+| :------------------------------------------ | :--------------- | :----------- | :----------- |
+| m5n.metal (Intel Cascade Lake)              | al2 linux_5.10   | ubuntu 24.04 | linux_5.10   |
+| m6i.metal (Intel Ice Lake)                  | al2023 linux_6.1 |              | linux_6.1    |
+| m7i.metal-24xl (Intel Sapphire Rapids)      |                  |              |              |
+| m7i.metal-48xl (Intel Sapphire Rapids)      |                  |              |              |
+| **m8i.metal-48xl (Intel Granite Rapids)\*** |                  |              |              |
+| **m8i.metal-96xl (Intel Granite Rapids)\*** |                  |              |              |
+| m6a.metal (AMD Milan)                       |                  |              |              |
+| m7a.metal-48xl (AMD Genoa)                  |                  |              |              |
+| m6g.metal (Graviton 2)                      |                  |              |              |
+| m7g.metal (Graviton 3)                      |                  |              |              |
+| m8g.metal-24xl (Graviton 4)                 |                  |              |              |
+| m8g.metal-48xl (Graviton 4)                 |                  |              |              |
+
+**\***: We **only** support AWS EC2 8th Gen Intel (\*8i) instances using a 6.1
+host kernel. This is due to poor kernel support for Granite Rapids CPUs on 5.10.
 
 ## Known issues and Limitations