RE: [PATCH v6 6/6] arm64: hyperv: Implement hv_is_isolation_supported() for CCA Realms

[Michael Kelley <mhklinux@outlook.com>]

From: Kameron Carr <kameroncarr@linux.microsoft.com> Sent: Friday, October 30, 2026 5:14 PM
> 
> Provide an arm64 implementation of hv_is_isolation_supported() that
> overrides the __weak default in drivers/hv/hv_common.c.
> 
> The implementation deliberately does not depend on
> hv_is_hyperv_initialized() because hv_common_init() consults
> hv_is_isolation_supported() before hyperv_initialized is set.

Quibble: What's the genesis of this statement about
hv_is_hyperv_initialized()? On the x86 side, hv_is_isolation_supported()
doesn't depend on hv_is_hyperv_initialized(), so I don't think you
are making a distinction vs. what x86 does. The statement seems
like it might be a leftover from an early version of this patch set.

Michael

> 
> Reviewed-by: Michael Kelley <mhklinux@outlook.com>
> Signed-off-by: Kameron Carr <kameroncarr@linux.microsoft.com>
> ---
>  arch/arm64/hyperv/mshyperv.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
> index da6c3aa0..8a2c446 100644
> --- a/arch/arm64/hyperv/mshyperv.c
> +++ b/arch/arm64/hyperv/mshyperv.c
> @@ -187,3 +187,8 @@ bool hv_isolation_type_cca(void)
>  {
>  	return is_realm_world();
>  }
> +
> +bool hv_is_isolation_supported(void)
> +{
> +	return is_realm_world();
> +}
> --
> 2.45.4
>