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Message-Id: <20211208145228.42048-1-ltykernel@gmail.com>
Date: Wed, 8 Dec 2021 09:52:28 -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,
thomas.lendacky@....com, Tianyu.Lan@...rosoft.com,
michael.h.kelley@...rosoft.com, kys@...rosoft.com
Cc: linux-kernel@...r.kernel.org, vkuznets@...hat.com,
brijesh.singh@....com, konrad.wilk@...cle.com, hch@....de,
wei.liu@...nel.org, robin.murphy@....com, joro@...tes.org,
parri.andrea@...il.com, dave.hansen@...el.com,
linux-hyperv@...r.kernel.org
Subject: [PATCH V6.1] 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 encrypt guest memory. In
isolation VM, swiotlb bounce buffer size needs to adjust
according to memory size in the sev_setup_arch(). Add GUEST_MEM_
ENCRYPT check in the Isolation VM.
Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
---
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
hyperv_cc_platform_has().
---
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)
#endif
}
+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;
}
EXPORT_SYMBOL_GPL(cc_platform_has);
--
2.25.1
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