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

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
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)

+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;
 \ /
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