[PATCH V3 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()

Tianyu Lan
2021-12-01T16:03:12Z

From: Tianyu Lan <Tianyu.Lan@microsoft.com>

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@microsoft.com>
---
arch/x86/kernel/cc_platform.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c
index 03bb2f343ddb..f3bb0431f5c5 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 +59,23 @@ static bool amd_cc_platform_has(enum cc_attr attr)
#endif
}

+static bool hyperv_cc_platform_has(enum cc_attr attr)
+{
+#ifdef CONFIG_HYPERV
+ if (attr == CC_ATTR_GUEST_MEM_ENCRYPT)
+ return true;
+ else
+ return false;
+#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