diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 10cc6199bf67..d0db8cc4293e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1515,6 +1515,7 @@ config AMD_MEM_ENCRYPT
 	select ARCH_USE_MEMREMAP_PROT
 	select ARCH_HAS_FORCE_DMA_UNENCRYPTED
 	select INSTRUCTION_DECODER
+	select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
 	help
 	  Say yes to enable support for the encryption of system memory.
 	  This requires an AMD processor that supports Secure Memory
diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 04a780abb512..225704ed2055 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -277,7 +277,7 @@ static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
 			return ES_EXCEPTION;
 		}
 
-		insn_init(&ctxt->insn, buffer, MAX_INSN_SIZE - res, 1);
+		insn_init(&ctxt->insn, buffer, MAX_INSN_SIZE, 1);
 		insn_get_length(&ctxt->insn);
 	}
 
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 4b01f7dbaf30..f3eb53fe0215 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/bitops.h>
 #include <linux/dma-mapping.h>
+#include <linux/virtio_config.h>
 
 #include <asm/tlbflush.h>
 #include <asm/fixmap.h>
@@ -484,3 +485,8 @@ void __init mem_encrypt_init(void)
 	print_mem_encrypt_feature_info();
 }
 
+int arch_has_restricted_virtio_memory_access(void)
+{
+	return sev_active();
+}
+EXPORT_SYMBOL_GPL(arch_has_restricted_virtio_memory_access);