new file mode 100644
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Snippet definitions
+ *
+ * Copyright IBM Corp. 2021
+ * Author: Janosch Frank <frankja@linux.ibm.com>
+ */
+
+#ifndef _S390X_SNIPPET_H_
+#define _S390X_SNIPPET_H_
+
+/* This macro cuts down the length of the pointers to snippets */
+#define SNIPPET_NAME_START(type, file) \
+ _binary_s390x_snippets_##type##_##file##_gbin_start
+#define SNIPPET_NAME_END(type, file) \
+ _binary_s390x_snippets_##type##_##file##_gbin_end
+
+/* Returns the length of the snippet */
+#define SNIPPET_LEN(type, file) \
+ ((uintptr_t)SNIPPET_NAME_END(type, file) - (uintptr_t)SNIPPET_NAME_START(type, file))
+
+/*
+ * C snippet instructions start at 0x4000 due to the prefix and the
+ * stack being before that. ASM snippets don't strictly need a stack
+ * but keeping the starting address the same means less code.
+ */
+#define SNIPPET_ENTRY_ADDR 0x4000
+
+/* Standard entry PSWs for snippets which can simply be copied into the guest PSW */
+static const struct psw snippet_psw = {
+ .mask = PSW_MASK_64,
+ .addr = SNIPPET_ENTRY_ADDR,
+};
+#endif
@@ -19,6 +19,7 @@
#include <vm.h>
#include <sclp.h>
#include <sie.h>
+#include <snippet.h>
static u8 *guest;
static struct vm vm;
@@ -27,8 +28,8 @@ static uint8_t *src;
static uint8_t *dst;
static uint8_t *cmp;
-extern const char _binary_s390x_snippets_c_mvpg_snippet_gbin_start[];
-extern const char _binary_s390x_snippets_c_mvpg_snippet_gbin_end[];
+extern const char SNIPPET_NAME_START(c, mvpg_snippet)[];
+extern const char SNIPPET_NAME_END(c, mvpg_snippet)[];
int binary_size;
static void test_mvpg_pei(void)
@@ -77,10 +78,9 @@ static void test_mvpg_pei(void)
static void test_mvpg(void)
{
- int binary_size = ((uintptr_t)_binary_s390x_snippets_c_mvpg_snippet_gbin_end -
- (uintptr_t)_binary_s390x_snippets_c_mvpg_snippet_gbin_start);
+ int binary_size = SNIPPET_LEN(c, mvpg_snippet);
- memcpy(guest, _binary_s390x_snippets_c_mvpg_snippet_gbin_start, binary_size);
+ memcpy(guest, SNIPPET_NAME_START(c, mvpg_snippet), binary_size);
memset(src, 0x42, PAGE_SIZE);
memset(dst, 0x43, PAGE_SIZE);
sie(&vm);
@@ -96,8 +96,7 @@ static void setup_guest(void)
sie_guest_create(&vm, (uint64_t)guest, HPAGE_SIZE);
- vm.sblk->gpsw.addr = PAGE_SIZE * 4;
- vm.sblk->gpsw.mask = PSW_MASK_64;
+ vm.sblk->gpsw = snippet_psw;
vm.sblk->ictl = ICTL_OPEREXC | ICTL_PINT;
/* Enable MVPG interpretation as we want to test KVM and not ourselves */
vm.sblk->eca = ECA_MVPGI;