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authorHalil Pasic <pasic@linux.ibm.com>2018-09-13 18:57:16 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2019-06-15 12:24:51 +0200
commit64e1f0c531d1072cd97939bf0d8df42b26713543 (patch)
treee98f6f8de50fd7bf6f68627f558469c3b3f3915b /arch/s390/include/asm/mem_encrypt.h
parent45488c48e49b6ded9850bb0293668a92f96293c2 (diff)
s390/mm: force swiotlb for protected virtualization
On s390, protected virtualization guests have to use bounced I/O buffers. That requires some plumbing. Let us make sure, any device that uses DMA API with direct ops correctly is spared from the problems, that a hypervisor attempting I/O to a non-shared page would bring. Signed-off-by: Halil Pasic <pasic@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Reviewed-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/mem_encrypt.h')
-rw-r--r--arch/s390/include/asm/mem_encrypt.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/s390/include/asm/mem_encrypt.h b/arch/s390/include/asm/mem_encrypt.h
new file mode 100644
index 000000000000..3eb018508190
--- /dev/null
+++ b/arch/s390/include/asm/mem_encrypt.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef S390_MEM_ENCRYPT_H__
+#define S390_MEM_ENCRYPT_H__
+
+#ifndef __ASSEMBLY__
+
+#define sme_me_mask 0ULL
+
+static inline bool sme_active(void) { return false; }
+extern bool sev_active(void);
+
+int set_memory_encrypted(unsigned long addr, int numpages);
+int set_memory_decrypted(unsigned long addr, int numpages);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* S390_MEM_ENCRYPT_H__ */

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