[kvm-unit-tests PATCH v2 5/7] s390x: sie: Add first SIE test

[Janosch Frank <frankja@linux.ibm.com>]

Let's check if we get the correct interception data on a few
diags. This commit is more of an addition of boilerplate code than a
real test.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 s390x/Makefile      |   1 +
 s390x/sie.c         | 125 ++++++++++++++++++++++++++++++++++++++++++++
 s390x/unittests.cfg |   3 ++
 3 files changed, 129 insertions(+)
 create mode 100644 s390x/sie.c

diff --git a/s390x/Makefile b/s390x/Makefile
index b079a26..7a95092 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -19,6 +19,7 @@ tests += $(TEST_DIR)/smp.elf
 tests += $(TEST_DIR)/sclp.elf
 tests += $(TEST_DIR)/css.elf
 tests += $(TEST_DIR)/uv-guest.elf
+tests += $(TEST_DIR)/sie.elf
 
 tests_binary = $(patsubst %.elf,%.bin,$(tests))
 ifneq ($(HOST_KEY_DOCUMENT),)
diff --git a/s390x/sie.c b/s390x/sie.c
new file mode 100644
index 0000000..41b429a
--- /dev/null
+++ b/s390x/sie.c
@@ -0,0 +1,125 @@
+#include <libcflat.h>
+#include <asm/asm-offsets.h>
+#include <asm/arch_def.h>
+#include <asm/interrupt.h>
+#include <asm/page.h>
+#include <alloc_page.h>
+#include <vmalloc.h>
+#include <asm/facility.h>
+#include <mmu.h>
+#include <sclp.h>
+#include <sie.h>
+
+static u8 *guest;
+static u8 *guest_instr;
+static struct vm vm;
+
+static void handle_validity(struct vm *vm)
+{
+	report(0, "VALIDITY: %x", vm->sblk->ipb >> 16);
+}
+
+static void sie(struct vm *vm)
+{
+	while (vm->sblk->icptcode == 0) {
+		sie64a(vm->sblk, &vm->save_area);
+		if (vm->sblk->icptcode == 32)
+		    handle_validity(vm);
+	}
+	vm->save_area.guest.grs[14] = vm->sblk->gg14;
+	vm->save_area.guest.grs[15] = vm->sblk->gg15;
+}
+
+static void sblk_cleanup(struct vm *vm)
+{
+	vm->sblk->icptcode = 0;
+}
+
+static void intercept_diag_10(void)
+{
+	u32 instr = 0x83020010;
+
+	vm.sblk->gpsw.addr = PAGE_SIZE * 2;
+	vm.sblk->gpsw.mask = 0x0000000180000000ULL;
+
+	memset(guest_instr, 0, PAGE_SIZE);
+	memcpy(guest_instr, &instr, 4);
+	sie(&vm);
+	report(vm.sblk->icptcode == 4 && vm.sblk->ipa == 0x8302 && vm.sblk->ipb == 0x100000,
+	       "Diag 10 intercept");
+	sblk_cleanup(&vm);
+}
+
+static void intercept_diag_44(void)
+{
+	u32 instr = 0x83020044;
+
+	vm.sblk->gpsw.addr = PAGE_SIZE * 2;
+	vm.sblk->gpsw.mask = 0x0000000180000000ULL;
+
+	memset(guest_instr, 0, PAGE_SIZE);
+	memcpy(guest_instr, &instr, 4);
+	sie(&vm);
+	report(vm.sblk->icptcode == 4 && vm.sblk->ipa == 0x8302 && vm.sblk->ipb == 0x440000,
+	       "Diag 44 intercept");
+	sblk_cleanup(&vm);
+}
+
+static void intercept_diag_9c(void)
+{
+	u32 instr = 0x8302009c;
+
+	vm.sblk->gpsw.addr = PAGE_SIZE * 2;
+	vm.sblk->gpsw.mask = 0x0000000180000000ULL;
+
+	memset(guest_instr, 0, PAGE_SIZE);
+	memcpy(guest_instr, &instr, 4);
+	sie(&vm);
+	report(vm.sblk->icptcode == 4 && vm.sblk->ipa == 0x8302 && vm.sblk->ipb == 0x9c0000,
+	       "Diag 9c intercept");
+	sblk_cleanup(&vm);
+}
+
+static void setup_guest(void)
+{
+	setup_vm();
+
+	/* Allocate 1MB as guest memory */
+	guest = alloc_pages(8);
+	/* The first two pages are the lowcore */
+	guest_instr = guest + PAGE_SIZE * 2;
+
+	vm.sblk = alloc_page();
+
+	vm.sblk->cpuflags = CPUSTAT_ZARCH | CPUSTAT_RUNNING;
+	vm.sblk->prefix = 0;
+	/*
+	 * Pageable guest with the same ASCE as the test programm, but
+	 * the guest memory 0x0 is offset to start at the allocated
+	 * guest pages and end after 1MB.
+	 *
+	 * It's not pretty but faster and easier than managing guest ASCEs.
+	 */
+	vm.sblk->mso = (u64)guest;
+	vm.sblk->msl = (u64)guest;
+	vm.sblk->ihcpu = 0xffff;
+
+	vm.sblk->crycbd = (uint64_t)alloc_page();
+}
+
+int main(void)
+{
+	report_prefix_push("sie");
+	if (!sclp_facilities.has_sief2) {
+		report_skip("SIEF2 facility unavailable");
+		goto done;
+	}
+
+	setup_guest();
+	intercept_diag_10();
+	intercept_diag_44();
+	intercept_diag_9c();
+done:
+	report_prefix_pop();
+	return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index 3feb8bc..2298be6 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -96,3 +96,6 @@ smp = 2
 
 [uv-guest]
 file = uv-guest.elf
+
+[sie]
+file = sie.elf
-- 
2.25.1