linux-kernel - [PATCH V2 3/6] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform

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Message-Id: <20211123143039.331929-4-ltykernel@gmail.com>
Date:   Tue, 23 Nov 2021 09:30:34 -0500
From:   Tianyu Lan <ltykernel@...il.com>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        luto@...nel.org, peterz@...radead.org, jgross@...e.com,
        sstabellini@...nel.org, boris.ostrovsky@...cle.com,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, joro@...tes.org,
        will@...nel.org, davem@...emloft.net, kuba@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com,
        Tianyu.Lan@...rosoft.com, thomas.lendacky@....com,
        xen-devel@...ts.xenproject.org, michael.h.kelley@...rosoft.com
Cc:     iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org, vkuznets@...hat.com, brijesh.singh@....com,
        konrad.wilk@...cle.com, parri.andrea@...il.com,
        dave.hansen@...el.com
Subject: [PATCH V2 3/6] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()

From: Tianyu Lan <Tianyu.Lan@...rosoft.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@...rosoft.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