[PATCH 1/1] Documentation: hyperv: Update information on guest CPU offlining

[PATCH 1/1] Documentation: hyperv: Update information on guest CPU offlining

[Michael Kelley]

In Hyper-V Overview documentation, remove the out-of-date reference
to explicitly reassigning VMBus channel interrupts before taking a
guest CPU offline. Instead, reference the VMBus documentation, which
is already up-to-date on this topic.

Signed-off-by: Michael Kelley <mhklinux@outlook.com>
---
 Documentation/virt/hyperv/overview.rst | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/virt/hyperv/overview.rst b/Documentation/virt/hyperv/overview.rst
index 77408a89d1a4..63489f73a299 100644
--- a/Documentation/virt/hyperv/overview.rst
+++ b/Documentation/virt/hyperv/overview.rst
@@ -132,11 +132,11 @@ Starting in Windows Server 2022 Hyper-V, the ACPI tables reflect
 only the CPUs actually present in the VM, so Linux does not report
 any hot-add CPUs.
 
-A Linux guest CPU may be taken offline using the normal Linux
-mechanisms, provided no VMBus channel interrupts are assigned to
-the CPU.  See the section on VMBus Interrupts for more details
-on how VMBus channel interrupts can be re-assigned to permit
-taking a CPU offline.
+A Linux guest CPU may be taken offline, and subsequently brought
+back online, using the normal Linux mechanisms. See the "VMBus
+Interrupts" section of Documentation/virt/hyperv/vmbus.rst
+documentation for how VMBus channel interrupts are automatically
+re-assigned if necessary when taking a CPU offline.
 
 32-bit and 64-bit
 -----------------
-- 
2.25.1

Re: [PATCH 1/1] Documentation: hyperv: Update information on guest CPU offlining

[Naman Jain]

On 10/17/2026 9:38 PM, Michael Kelley wrote:
> In Hyper-V Overview documentation, remove the out-of-date reference
> to explicitly reassigning VMBus channel interrupts before taking a
> guest CPU offline. Instead, reference the VMBus documentation, which
> is already up-to-date on this topic.
> 
> Signed-off-by: Michael Kelley <mhklinux@outlook.com>
> ---
>   Documentation/virt/hyperv/overview.rst | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/virt/hyperv/overview.rst b/Documentation/virt/hyperv/overview.rst
> index 77408a89d1a4..63489f73a299 100644
> --- a/Documentation/virt/hyperv/overview.rst
> +++ b/Documentation/virt/hyperv/overview.rst
> @@ -132,11 +132,11 @@ Starting in Windows Server 2022 Hyper-V, the ACPI tables reflect
>   only the CPUs actually present in the VM, so Linux does not report
>   any hot-add CPUs.
>   
> -A Linux guest CPU may be taken offline using the normal Linux
> -mechanisms, provided no VMBus channel interrupts are assigned to
> -the CPU.  See the section on VMBus Interrupts for more details
> -on how VMBus channel interrupts can be re-assigned to permit
> -taking a CPU offline.
> +A Linux guest CPU may be taken offline, and subsequently brought
> +back online, using the normal Linux mechanisms. See the "VMBus
> +Interrupts" section of Documentation/virt/hyperv/vmbus.rst
> +documentation for how VMBus channel interrupts are automatically
> +re-assigned if necessary when taking a CPU offline.
>   
>   32-bit and 64-bit
>   -----------------

LGTM.

Reviewed-by: Naman Jain <namjain@linux.microsoft.com>

Regards,
Naman

Re: [PATCH 1/1] Documentation: hyperv: Update information on guest CPU offlining

[Hamza Mahfooz]

On Sat, Oct 17, 2026 at 09:08:48AM -0700, Michael Kelley wrote:
> In Hyper-V Overview documentation, remove the out-of-date reference
> to explicitly reassigning VMBus channel interrupts before taking a
> guest CPU offline. Instead, reference the VMBus documentation, which
> is already up-to-date on this topic.
> 
> Signed-off-by: Michael Kelley <mhklinux@outlook.com>

Reviewed-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>

> ---
>  Documentation/virt/hyperv/overview.rst | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/virt/hyperv/overview.rst b/Documentation/virt/hyperv/overview.rst
> index 77408a89d1a4..63489f73a299 100644
> --- a/Documentation/virt/hyperv/overview.rst
> +++ b/Documentation/virt/hyperv/overview.rst
> @@ -132,11 +132,11 @@ Starting in Windows Server 2022 Hyper-V, the ACPI tables reflect
>  only the CPUs actually present in the VM, so Linux does not report
>  any hot-add CPUs.
>  
> -A Linux guest CPU may be taken offline using the normal Linux
> -mechanisms, provided no VMBus channel interrupts are assigned to
> -the CPU.  See the section on VMBus Interrupts for more details
> -on how VMBus channel interrupts can be re-assigned to permit
> -taking a CPU offline.
> +A Linux guest CPU may be taken offline, and subsequently brought
> +back online, using the normal Linux mechanisms. See the "VMBus
> +Interrupts" section of Documentation/virt/hyperv/vmbus.rst
> +documentation for how VMBus channel interrupts are automatically
> +re-assigned if necessary when taking a CPU offline.
>  
>  32-bit and 64-bit
>  -----------------
> -- 
> 2.25.1
>