Since it was never possible to use a non-PAGE_SIZE-aligned @source_addr,
go ahead and document this as a requirement. This is in preparation for
enforcing page-aligned @source_addr for all architectures in
guest_memfd.

Reviewed-by: Vishal Annapurve <vannapurve@google.com>
Tested-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
---
 Documentation/virt/kvm/x86/intel-tdx.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/virt/kvm/x86/intel-tdx.rst b/Documentation/virt/kvm/x86/intel-tdx.rst
index 5efac62c92c7..6a222e9d0954 100644
--- a/Documentation/virt/kvm/x86/intel-tdx.rst
+++ b/Documentation/virt/kvm/x86/intel-tdx.rst
@@ -156,7 +156,7 @@ KVM_TDX_INIT_MEM_REGION
 :Returns: 0 on success, <0 on error
 
 Initialize @nr_pages TDX guest private memory starting from @gpa with userspace
-provided data from @source_addr.
+provided data from @source_addr. @source_addr must be PAGE_SIZE-aligned.
 
 Note, before calling this sub command, memory attribute of the range
 [gpa, gpa + nr_pages] needs to be private.  Userspace can use
-- 
2.25.1

Reviewed-by: Yan Zhao <yan.y.zhao@intel.com>

On Thu, Jan 08, 2026 at 03:46:21PM -0600, Michael Roth wrote:
> Since it was never possible to use a non-PAGE_SIZE-aligned @source_addr,
> go ahead and document this as a requirement. This is in preparation for
> enforcing page-aligned @source_addr for all architectures in
> guest_memfd.
> 
> Reviewed-by: Vishal Annapurve <vannapurve@google.com>
> Tested-by: Kai Huang <kai.huang@intel.com>
> Signed-off-by: Michael Roth <michael.roth@amd.com>
> ---
>  Documentation/virt/kvm/x86/intel-tdx.rst | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/virt/kvm/x86/intel-tdx.rst b/Documentation/virt/kvm/x86/intel-tdx.rst
> index 5efac62c92c7..6a222e9d0954 100644
> --- a/Documentation/virt/kvm/x86/intel-tdx.rst
> +++ b/Documentation/virt/kvm/x86/intel-tdx.rst
> @@ -156,7 +156,7 @@ KVM_TDX_INIT_MEM_REGION
>  :Returns: 0 on success, <0 on error
>  
>  Initialize @nr_pages TDX guest private memory starting from @gpa with userspace
> -provided data from @source_addr.
> +provided data from @source_addr. @source_addr must be PAGE_SIZE-aligned.
>  
>  Note, before calling this sub command, memory attribute of the range
>  [gpa, gpa + nr_pages] needs to be private.  Userspace can use
> -- 
> 2.25.1
>