Re: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()

[Wei Liu]

On Mon, Dec 13, 2021 at 02:14:03AM -0500, Tianyu Lan wrote:
> From: Tianyu Lan 
> 
> Hyper-V provides Isolation VM for confidential computing support and
> guest memory is encrypted in it. Places checking cc_platform_has()
> with GUEST_MEM_ENCRYPT attr should return "True" in Isolation vm. e.g,
> swiotlb bounce buffer size needs to adjust according to memory size
> in the sev_setup_arch(). Add GUEST_MEM_ENCRYPT check for Hyper-V Isolation
> VM.
> 
> Signed-off-by: Tianyu Lan 

x86 maintainers, any comment on this patch?

> ---
> Change since v6:
>   * Change the order in the cc_platform_has() and check sev first.
> 
> Change since v3:
>   * Change code style of checking GUEST_MEM attribute in the
> hyperv_cc_platform_has().
> ---
>  arch/x86/kernel/cc_platform.c | 8 
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c
> index 03bb2f343ddb..6cb3a675e686 100644
> --- a/arch/x86/kernel/cc_platform.c
> +++ b/arch/x86/kernel/cc_platform.c
> @@ -11,6 +11,7 @@
>  #include 
>  #include 
>  
> +#include 
>  #include 
>  
>  static bool __maybe_unused intel_cc_platform_has(enum cc_attr attr)
> @@ -58,12 +59,19 @@ static bool amd_cc_platform_has(enum cc_attr attr)
>  #endif
>  }
>  
> +static bool hyperv_cc_platform_has(enum cc_attr attr)
> +{
> + return attr == CC_ATTR_GUEST_MEM_ENCRYPT;
> +}
>  
>  bool cc_platform_has(enum cc_attr attr)
>  {
>   if (sme_me_mask)
>   return amd_cc_platform_has(attr);
>  
> + if (hv_is_isolation_supported())
> + return hyperv_cc_platform_has(attr);
> +
>   return false;
>  }
>  EXPORT_SYMBOL_GPL(cc_platform_has);
> -- 
> 2.25.1
> 
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[PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()

[Tianyu Lan]

From: Tianyu Lan 

Hyper-V provides Isolation VM for confidential computing support and
guest memory is encrypted in it. Places checking cc_platform_has()
with GUEST_MEM_ENCRYPT attr should return "True" in Isolation vm. e.g,
swiotlb bounce buffer size needs to adjust according to memory size
in the sev_setup_arch(). Add GUEST_MEM_ENCRYPT check for Hyper-V Isolation
VM.

Signed-off-by: Tianyu Lan 
---
Change since v6:
* Change the order in the cc_platform_has() and check sev first.

Change since v3:
* Change code style of checking GUEST_MEM attribute in the
  hyperv_cc_platform_has().
---
 arch/x86/kernel/cc_platform.c | 8 
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c
index 03bb2f343ddb..6cb3a675e686 100644
--- a/arch/x86/kernel/cc_platform.c
+++ b/arch/x86/kernel/cc_platform.c
@@ -11,6 +11,7 @@
 #include 
 #include 
 
+#include 
 #include 
 
 static bool __maybe_unused intel_cc_platform_has(enum cc_attr attr)
@@ -58,12 +59,19 @@ static bool amd_cc_platform_has(enum cc_attr attr)
 #endif
 }
 
+static bool hyperv_cc_platform_has(enum cc_attr attr)
+{
+   return attr == CC_ATTR_GUEST_MEM_ENCRYPT;
+}
 
 bool cc_platform_has(enum cc_attr attr)
 {
if (sme_me_mask)
return amd_cc_platform_has(attr);
 
+   if (hv_is_isolation_supported())
+   return hyperv_cc_platform_has(attr);
+
return false;
 }
 EXPORT_SYMBOL_GPL(cc_platform_has);
-- 
2.25.1

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