From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
Hyper-V provides Isolation VM which has memory encrypt support. Add
hyperv_cc_platform_has() and return true for check of GUEST_MEM_ENCRYPT
attribute.
Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
---
Change since v3:
* Change code style of checking GUEST_MEM attribute in the
hyperv_cc_platform_has().
---
arch/x86/kernel/cc_platform.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c
index 03bb2f343ddb..7b66793c0f25 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)
@@ -58,9 +59,20 @@ static bool amd_cc_platform_has(enum cc_attr attr)
#endif
}
+static bool hyperv_cc_platform_has(enum cc_attr attr)
+{
+#if IS_ENABLED(CONFIG_HYPERV)
+ return attr == CC_ATTR_GUEST_MEM_ENCRYPT;
+#else
+ return false;
+#endif
+}
bool cc_platform_has(enum cc_attr attr)
{
+ if (hv_is_isolation_supported())
+ return hyperv_cc_platform_has(attr);
+
if (sme_me_mask)
return amd_cc_platform_has(attr);
--
2.25.1
