Simple EDAT test.
Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
---
s390x/Makefile | 1 +
s390x/edat.c | 238 ++++++++++++++++++++++++++++++++++++++++++++
s390x/unittests.cfg | 3 +
3 files changed, 242 insertions(+)
create mode 100644 s390x/edat.c
diff --git a/s390x/Makefile b/s390x/Makefile
index 08d85c9f..fc885150 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -20,6 +20,7 @@ tests += $(TEST_DIR)/sclp.elf
tests += $(TEST_DIR)/css.elf
tests += $(TEST_DIR)/uv-guest.elf
tests += $(TEST_DIR)/sie.elf
+tests += $(TEST_DIR)/edat.elf
tests_binary = $(patsubst %.elf,%.bin,$(tests))
ifneq ($(HOST_KEY_DOCUMENT),)
diff --git a/s390x/edat.c b/s390x/edat.c
new file mode 100644
index 00000000..504a1501
--- /dev/null
+++ b/s390x/edat.c
@@ -0,0 +1,238 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * EDAT test.
+ *
+ * Copyright (c) 2021 IBM Corp
+ *
+ * Authors:
+ * Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
+ */
+#include <libcflat.h>
+#include <vmalloc.h>
+#include <asm/facility.h>
+#include <asm/interrupt.h>
+#include <mmu.h>
+#include <asm/pgtable.h>
+#include <asm-generic/barrier.h>
+
+#define TEID_ADDR PAGE_MASK
+#define TEID_AI 0x003
+#define TEID_M 0x004
+#define TEID_A 0x008
+#define TEID_FS 0xc00
+
+#define LC_SIZE (2 * PAGE_SIZE)
+#define VIRT(x) ((void *)((unsigned long)(x) + (unsigned long)mem))
+
+static uint8_t prefix_buf[LC_SIZE] __attribute__((aligned(LC_SIZE)));
+static unsigned int tmp[1024] __attribute__((aligned(PAGE_SIZE)));
+static void *root, *mem, *m;
+static struct lowcore *lc;
+volatile unsigned int *p;
+
+/* Expect a program interrupt, and clear the TEID */
+static void expect_dat_fault(void)
+{
+ expect_pgm_int();
+ lc->trans_exc_id = 0;
+}
+
+/* Check if a protection exception happened for the given address */
+static bool check_pgm_prot(void *ptr)
+{
+ unsigned long teid = lc->trans_exc_id;
+
+ if (lc->pgm_int_code != PGM_INT_CODE_PROTECTION)
+ return 0;
+ if (~teid & TEID_M)
+ return 1;
+ return (~teid & TEID_A) &&
+ ((teid & TEID_ADDR) == ((uint64_t)ptr & PAGE_MASK)) &&
+ !(teid & TEID_AI);
+}
+
+static void test_dat(void)
+{
+ report_prefix_push("edat off");
+ /* disable EDAT */
+ ctl_clear_bit(0, 23);
+
+ /* Check some basics */
+ p[0] = 42;
+ report(p[0] == 42, "pte, r/w");
+ p[0] = 0;
+
+ protect_page(m, PAGE_ENTRY_P);
+ expect_dat_fault();
+ p[0] = 42;
+ unprotect_page(m, PAGE_ENTRY_P);
+ report(!p[0] && check_pgm_prot(m), "pte, ro");
+
+ /* The FC bit should be ignored because EDAT is off */
+ p[0] = 42;
+ protect_dat_entry(m, SEGMENT_ENTRY_FC, 4);
+ report(p[0] == 42, "pmd, fc=1, r/w");
+ unprotect_dat_entry(m, SEGMENT_ENTRY_FC, 4);
+ p[0] = 0;
+
+ /* Segment protection should work even with EDAT off */
+ protect_dat_entry(m, SEGMENT_ENTRY_P, 4);
+ expect_dat_fault();
+ p[0] = 42;
+ report(!p[0] && check_pgm_prot(m), "pmd, ro");
+ unprotect_dat_entry(m, SEGMENT_ENTRY_P, 4);
+
+ /* The FC bit should be ignored because EDAT is off*/
+ protect_dat_entry(m, REGION3_ENTRY_FC, 3);
+ p[0] = 42;
+ report(p[0] == 42, "pud, fc=1, r/w");
+ unprotect_dat_entry(m, REGION3_ENTRY_FC, 3);
+ p[0] = 0;
+
+ /* Region1/2/3 protection should not work, because EDAT is off */
+ protect_dat_entry(m, REGION_ENTRY_P, 3);
+ p[0] = 42;
+ report(p[0] == 42, "pud, ro");
+ unprotect_dat_entry(m, REGION_ENTRY_P, 3);
+ p[0] = 0;
+
+ protect_dat_entry(m, REGION_ENTRY_P, 2);
+ p[0] = 42;
+ report(p[0] == 42, "p4d, ro");
+ unprotect_dat_entry(m, REGION_ENTRY_P, 2);
+ p[0] = 0;
+
+ protect_dat_entry(m, REGION_ENTRY_P, 1);
+ p[0] = 42;
+ report(p[0] == 42, "pgd, ro");
+ unprotect_dat_entry(m, REGION_ENTRY_P, 1);
+ p[0] = 0;
+
+ report_prefix_pop();
+}
+
+static void test_edat1(void)
+{
+ report_prefix_push("edat1");
+ /* Enable EDAT */
+ ctl_set_bit(0, 23);
+ p[0] = 0;
+
+ /* Segment protection should work */
+ expect_dat_fault();
+ protect_dat_entry(m, SEGMENT_ENTRY_P, 4);
+ p[0] = 42;
+ report(!p[0] && check_pgm_prot(m), "pmd, ro");
+ unprotect_dat_entry(m, SEGMENT_ENTRY_P, 4);
+
+ /* Region1/2/3 protection should work now */
+ expect_dat_fault();
+ protect_dat_entry(m, REGION_ENTRY_P, 3);
+ p[0] = 42;
+ report(!p[0] && check_pgm_prot(m), "pud, ro");
+ unprotect_dat_entry(m, REGION_ENTRY_P, 3);
+
+ expect_dat_fault();
+ protect_dat_entry(m, REGION_ENTRY_P, 2);
+ p[0] = 42;
+ report(!p[0] && check_pgm_prot(m), "p4d, ro");
+ unprotect_dat_entry(m, REGION_ENTRY_P, 2);
+
+ expect_dat_fault();
+ protect_dat_entry(m, REGION_ENTRY_P, 1);
+ p[0] = 42;
+ report(!p[0] && check_pgm_prot(m), "pgd, ro");
+ unprotect_dat_entry(m, REGION_ENTRY_P, 1);
+
+ /* Large pages should work */
+ p[0] = 42;
+ install_large_page(root, 0, mem);
+ report(p[0] == 42, "pmd, large");
+
+ /* Prefixing should not work with large pages */
+ report(!memcmp(0, VIRT(prefix_buf), LC_SIZE) &&
+ !memcmp(prefix_buf, mem, LC_SIZE),
+ "pmd, large, prefixing");
+
+ report_prefix_pop();
+}
+
+static void test_edat2(void)
+{
+ report_prefix_push("edat2");
+ p[0] = 42;
+
+ /* Huge pages should work */
+ install_huge_page(root, 0, mem);
+ report(p[0] == 42, "pud, huge");
+
+ /* Prefixing should not work with huge pages */
+ report(!memcmp(0, VIRT(prefix_buf), LC_SIZE) &&
+ !memcmp(prefix_buf, mem, LC_SIZE),
+ "pmd, large, prefixing");
+
+ report_prefix_pop();
+}
+
+static unsigned int setup(void)
+{
+ bool has_edat1 = test_facility(8);
+ bool has_edat2 = test_facility(78);
+ unsigned long pa, va;
+
+ if (has_edat2 && !has_edat1)
+ report_abort("EDAT2 available, but EDAT1 not available");
+
+ /* Setup DAT 1:1 mapping and memory management */
+ setup_vm();
+ root = (void *)(stctg(1) & PAGE_MASK);
+
+ /*
+ * Get a pgd worth of virtual memory, so we can test things later
+ * without interfering with the test code or the interrupt handler
+ */
+ mem = alloc_vpages_aligned(BIT_ULL(41), 41);
+ assert(mem);
+ va = (unsigned long)mem;
+
+ /* Map the first 1GB of real memory */
+ for (pa = 0; pa < SZ_1G; pa += PAGE_SIZE, va += PAGE_SIZE)
+ install_page(root, pa, (void *)va);
+
+ /* Move the lowcore to a known non-zero location */
+ assert((unsigned long)&prefix_buf < SZ_2G);
+ memcpy(prefix_buf, 0, LC_SIZE);
+ set_prefix((uint32_t)(intptr_t)prefix_buf);
+ /* Clear the old copy */
+ memset(prefix_buf, 0, LC_SIZE);
+
+ /* m will point to tmp through the new virtual mapping */
+ m = VIRT(&tmp);
+ /* p is the same as m but volatile */
+ p = (volatile unsigned int *)m;
+
+ return has_edat1 + has_edat2;
+}
+
+int main(void)
+{
+ unsigned int edat;
+
+ report_prefix_push("edat");
+ edat = setup();
+
+ test_dat();
+
+ if (edat)
+ test_edat1();
+ else
+ report_skip("EDAT not available");
+
+ if (edat >= 2)
+ test_edat2();
+ else
+ report_skip("EDAT2 not available");
+
+ report_prefix_pop();
+ return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index 2298be6c..8da4a0a3 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -99,3 +99,6 @@ file = uv-guest.elf
[sie]
file = sie.elf
+
+[edat]
+file = edat.elf
--
2.26.2
