Re: [PATCH V6.1] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()

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On 12/8/2021 10:52 PM, Tianyu Lan wrote:
From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>

Hyper-V provides Isolation VM which encrypt guest memory. In
isolation VM, swiotlb bounce buffer size needs to adjust
according to memory size in the sev_setup_arch(). Add GUEST_MEM_
ENCRYPT check in the Isolation VM.

Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>

Hi Boris:
	Could you check whether this version is ok with you?

Thanks.

---
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 <linux/cc_platform.h>
  #include <linux/mem_encrypt.h>
+#include <asm/mshyperv.h>
  #include <asm/processor.h>
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);




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