linux-kernel - [PATCH 3/9] x86/hyperv: Mark Hyper-V vp assist page unencrypted in SEV-SNP enlightened guest

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Message-Id: <20230601151624.1757616-4-ltykernel@gmail.com>
Date:   Thu,  1 Jun 2023 11:16:16 -0400
From:   Tianyu Lan <ltykernel@...il.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, daniel.lezcano@...aro.org, arnd@...db.de,
        michael.h.kelley@...rosoft.com
Cc:     Tianyu Lan <tiala@...rosoft.com>, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        vkuznets@...hat.com
Subject: [PATCH 3/9] x86/hyperv: Mark Hyper-V vp assist page unencrypted in SEV-SNP enlightened guest

From: Tianyu Lan <tiala@...rosoft.com>

hv vp assist page needs to be shared between SEV-SNP guest and Hyper-V.
So mark the page unencrypted in the SEV-SNP guest.

Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
---
 arch/x86/hyperv/hv_init.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index b4a2327c823b..331b855314b7 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -18,6 +18,7 @@
 #include <asm/hyperv-tlfs.h>
 #include <asm/mshyperv.h>
 #include <asm/idtentry.h>
+#include <asm/set_memory.h>
 #include <linux/kexec.h>
 #include <linux/version.h>
 #include <linux/vmalloc.h>
@@ -113,6 +114,11 @@ static int hv_cpu_init(unsigned int cpu)
 
 	}
 	if (!WARN_ON(!(*hvp))) {
+		if (hv_isolation_type_en_snp()) {
+			WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1));
+			memset(*hvp, 0, PAGE_SIZE);
+		}
+
 		msr.enable = 1;
 		wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, msr.as_uint64);
 	}
-- 
2.25.1