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Message-Id: <20230818102919.1318039-4-ltykernel@gmail.com>
Date: Fri, 18 Aug 2023 06:29:13 -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, Michael Kelley <mikelley@...rosoft.com>
Subject: [PATCH v7 3/8] 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.
Reviewed-by: Dexuan Cui <decui@...rosoft.com>
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
---
arch/x86/hyperv/hv_init.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 318010eb9f9e..bcfbcda8b050 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>
@@ -106,8 +107,21 @@ static int hv_cpu_init(unsigned int cpu)
* in hv_cpu_die(), otherwise a CPU may not be stopped in the
* case of CPU offlining and the VM will hang.
*/
- if (!*hvp)
+ if (!*hvp) {
*hvp = __vmalloc(PAGE_SIZE, GFP_KERNEL | __GFP_ZERO);
+
+ /*
+ * Hyper-V should never specify a VM that is a Confidential
+ * VM and also running in the root partition. Root partition
+ * is blocked to run in Confidential VM. So only decrypt assist
+ * page in non-root partition here.
+ */
+ if (*hvp && hv_isolation_type_en_snp()) {
+ WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1));
+ memset(*hvp, 0, PAGE_SIZE);
+ }
+ }
+
if (*hvp)
msr.pfn = vmalloc_to_pfn(*hvp);
--
2.25.1
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