linux-kernel - [PATCH 1/4] x86/hyperv: Add missing ARCH_HAS_CC

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Date:   Tue, 22 Feb 2022 21:57:37 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...el.com, luto@...nel.org, peterz@...radead.org
Cc:     sathyanarayanan.kuppuswamy@...ux.intel.com, aarcange@...hat.com,
        ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com,
        hpa@...or.com, jmattson@...gle.com, seanjc@...gle.com,
        thomas.lendacky@....com, brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>
Subject: [PATCH 1/4] x86/hyperv: Add missing ARCH_HAS_CC_PLATFORM dependency

On x86, cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT) supposes to return
true for HyperV if isolation is supported. But it only does it if the
kernel is compiled with AMD_MEM_ENCRYPT enabled.

It happens due to missed ARCH_HAS_CC_PLATFORM dependency. Without
ARCH_HAS_CC_PLATFORM enabled, cc_platform_has() always returns false.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
Cc: Haiyang Zhang <haiyangz@...rosoft.com>
Cc: Stephen Hemminger <sthemmin@...rosoft.com>
Cc: Wei Liu <wei.liu@...nel.org>
Cc: Dexuan Cui <decui@...rosoft.com>
Cc: Tianyu Lan <Tianyu.Lan@...rosoft.com>
---
 drivers/hv/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 0747a8f1fcee..424d3f0751dc 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -8,6 +8,7 @@ config HYPERV
 		|| (ARM64 && !CPU_BIG_ENDIAN))
 	select PARAVIRT
 	select X86_HV_CALLBACK_VECTOR if X86
+	select ARCH_HAS_CC_PLATFORM if x86
 	select VMAP_PFN
 	help
 	  Select this option to run Linux as a Hyper-V client operating
-- 
2.34.1