Let's also check the PEI values to make sure our VSIE implementation
is correct.
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Acked-by: Thomas Huth <thuth@xxxxxxxxxx>
---
s390x/Makefile | 2 +
s390x/mvpg-sie.c | 149 ++++++++++++++++++++++++++++++++
s390x/snippets/c/mvpg-snippet.c | 33 +++++++
s390x/unittests.cfg | 3 +
4 files changed, 187 insertions(+)
create mode 100644 s390x/mvpg-sie.c
create mode 100644 s390x/snippets/c/mvpg-snippet.c
diff --git a/s390x/Makefile b/s390x/Makefile
index ba32f4c2..07af26d0 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -23,6 +23,7 @@ tests += $(TEST_DIR)/sie.elf
tests += $(TEST_DIR)/mvpg.elf
tests += $(TEST_DIR)/uv-host.elf
tests += $(TEST_DIR)/edat.elf
+tests += $(TEST_DIR)/mvpg-sie.elf
tests_binary = $(patsubst %.elf,%.bin,$(tests))
ifneq ($(HOST_KEY_DOCUMENT),)
@@ -82,6 +83,7 @@ snippet_asmlib = $(SNIPPET_DIR)/c/cstart.o
# perquisites (=guests) for the snippet hosts.
# $(TEST_DIR)/<snippet-host>.elf: snippets = $(SNIPPET_DIR)/<c/asm>/<snippet>.gbin
+$(TEST_DIR)/mvpg-sie.elf: snippets = $(SNIPPET_DIR)/c/mvpg-snippet.gbin
$(SNIPPET_DIR)/asm/%.gbin: $(SNIPPET_DIR)/asm/%.o $(FLATLIBS)
$(OBJCOPY) -O binary $(patsubst %.gbin,%.o,$@) $@
diff --git a/s390x/mvpg-sie.c b/s390x/mvpg-sie.c
new file mode 100644
index 00000000..9bcd15a2
--- /dev/null
+++ b/s390x/mvpg-sie.c
@@ -0,0 +1,149 @@
+#include <libcflat.h>
+#include <asm/asm-offsets.h>
+#include <asm-generic/barrier.h>
+#include <asm/pgtable.h>
+#include <mmu.h>
+#include <asm/page.h>
+#include <asm/facility.h>
+#include <asm/mem.h>
+#include <alloc_page.h>
+#include <vm.h>
+#include <sclp.h>
+#include <sie.h>
+
+static u8 *guest;
+static u8 *guest_instr;
+static struct vm vm;
+
+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[];
+int binary_size;
+
+static void sie(struct vm *vm)
+{
+ /* Reset icptcode so we don't trip over it below */
+ vm->sblk->icptcode = 0;
+
+ while (vm->sblk->icptcode == 0) {
+ sie64a(vm->sblk, &vm->save_area);
+ assert(vm->sblk->icptcode != ICPT_VALIDITY);
+ }
+ vm->save_area.guest.grs[14] = vm->sblk->gg14;
+ vm->save_area.guest.grs[15] = vm->sblk->gg15;
+}
+
+static void test_mvpg_pei(void)
+{
+ uint64_t **pei_dst = (uint64_t **)((uintptr_t) vm.sblk + 0xc0);
+ uint64_t **pei_src = (uint64_t **)((uintptr_t) vm.sblk + 0xc8);
+
+ report_prefix_push("pei");
+
+ report_prefix_push("src");
+ memset(dst, 0, PAGE_SIZE);
+ protect_page(src, PAGE_ENTRY_I);
+ sie(&vm);
+ report(vm.sblk->icptcode == ICPT_PARTEXEC, "Partial execution");
+ report((uintptr_t)**pei_src == (uintptr_t)src + PAGE_ENTRY_I, "PEI_SRC correct");
+ report((uintptr_t)**pei_dst == (uintptr_t)dst, "PEI_DST correct");
+ unprotect_page(src, PAGE_ENTRY_I);
+ report(!memcmp(cmp, dst, PAGE_SIZE), "Destination intact");
+ /*
+ * We need to execute the diag44 which is used as a blocker
+ * behind the mvpg. It makes sure we fail the tests above if
+ * the mvpg wouldn't have intercepted.
+ */
+ sie(&vm);
+ /* Make sure we intercepted for the diag44 and nothing else */
+ assert(vm.sblk->icptcode == ICPT_INST &&
+ vm.sblk->ipa == 0x8300 && vm.sblk->ipb == 0x440000);
+ report_prefix_pop();
+
+ /* Clear PEI data for next check */
+ report_prefix_push("dst");
+ memset((uint64_t *)((uintptr_t) vm.sblk + 0xc0), 0, 16);
+ memset(dst, 0, PAGE_SIZE);
+ protect_page(dst, PAGE_ENTRY_I);
+ sie(&vm);
+ report(vm.sblk->icptcode == ICPT_PARTEXEC, "Partial execution");
+ report((uintptr_t)**pei_src == (uintptr_t)src, "PEI_SRC correct");
+ report((uintptr_t)**pei_dst == (uintptr_t)dst + PAGE_ENTRY_I, "PEI_DST correct");
+ /* Needed for the memcmp and general cleanup */
+ unprotect_page(dst, PAGE_ENTRY_I);
+ report(!memcmp(cmp, dst, PAGE_SIZE), "Destination intact");
+ report_prefix_pop();
+
+ report_prefix_pop();
+}
+
+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);
+
+ memcpy(guest, _binary_s390x_snippets_c_mvpg_snippet_gbin_start, binary_size);
+ memset(src, 0x42, PAGE_SIZE);
+ memset(dst, 0x43, PAGE_SIZE);
+ sie(&vm);
+ report(!memcmp(src, dst, PAGE_SIZE) && *dst == 0x42, "Page moved");
+}
+
+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();
+
+ vm.sblk->gpsw.addr = PAGE_SIZE * 4;
+ vm.sblk->gpsw.mask = 0x0000000180000000ULL;
+ vm.sblk->ictl = ICTL_OPEREXC | ICTL_PINT;
+ /* Enable MVPG interpretation as we want to test KVM and not ourselves */
+ vm.sblk->eca = ECA_MVPGI;
+
+ src = guest + PAGE_SIZE * 6;
+ dst = guest + PAGE_SIZE * 5;
+ cmp = alloc_page();
+ memset(cmp, 0, PAGE_SIZE);
+}
+
+int main(void)
+{
+ report_prefix_push("mvpg-sie");
+ if (!sclp_facilities.has_sief2) {
+ report_skip("SIEF2 facility unavailable");
+ goto done;
+ }
+
+ setup_guest();
+ test_mvpg();
+ test_mvpg_pei();
+
+done:
+ report_prefix_pop();
+ return report_summary();
+
+}
diff --git a/s390x/snippets/c/mvpg-snippet.c b/s390x/snippets/c/mvpg-snippet.c
new file mode 100644
index 00000000..c1eb5d77
--- /dev/null
+++ b/s390x/snippets/c/mvpg-snippet.c
@@ -0,0 +1,33 @@
+#include <libcflat.h>
+
+static inline void force_exit(void)
+{
+ asm volatile(" diag 0,0,0x44\n");
+}
+
+static inline int mvpg(unsigned long r0, void *dest, void *src)
+{
+ register unsigned long reg0 asm ("0") = r0;
+ int cc;
+
+ asm volatile(" mvpg %1,%2\n"
+ " ipm %0\n"
+ " srl %0,28"
+ : "=d" (cc) : "a" (dest), "a" (src), "d" (reg0)
+ : "memory", "cc");
+ return cc;
+}
+
+static void test_mvpg_real(void)
+{
+ mvpg(0, (void *)0x5000, (void *)0x6000);
+ force_exit();
+}
+
+__attribute__((section(".text"))) int main(void)
+{
+ test_mvpg_real();
+ test_mvpg_real();
+ test_mvpg_real();
+ return 0;
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index a0ec8864..9e1802fd 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -106,3 +106,6 @@ timeout = 10
[edat]
file = edat.elf
+
+[mvpg-sie]
+file = mvpg-sie.elf
--
2.31.1
