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selftests/x86/lam: Add ARCH_FORCE_TAGGED_SVA test cases for linear-address masking

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By default do not allow to enable both LAM and use SVA in the same
process.
The new ARCH_FORCE_TAGGED_SVA arch_prctl() overrides the limitation.

Add new test cases for the new arch_prctl:
Before using ARCH_FORCE_TAGGED_SVA, should not allow to enable LAM/SVA
coexisting. the test cases should be negative.

The test depands on idxd driver and iommu. before test, need add
"intel_iommu=on,sm_on" in kernel command line and insmod idxd driver.

Signed-off-by: Weihong Zhang <weihong.zhang@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20230312112612.31869-17-kirill.shutemov%40linux.intel.com
This commit is contained in:
Weihong Zhang
2023-03-12 14:26:11 +03:00
committed by Dave Hansen
parent 833c12ce0f
commit 34821473de
1 changed files with 235 additions and 2 deletions
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tools/testing/selftests/x86/lam.c
+235 -2
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@@ -30,6 +30,7 @@
#define ARCH_GET_UNTAG_MASK 0x4001
#define ARCH_ENABLE_TAGGED_ADDR 0x4002
#define ARCH_GET_MAX_TAG_BITS 0x4003
#define ARCH_FORCE_TAGGED_SVA 0x4004
/* Specified test function bits */
#define FUNC_MALLOC 0x1
@@ -38,8 +39,9 @@
#define FUNC_SYSCALL 0x8
#define FUNC_URING 0x10
#define FUNC_INHERITE 0x20
#define FUNC_PASID 0x40
#define TEST_MASK 0x3f
#define TEST_MASK 0x7f
#define LOW_ADDR (0x1UL << 30)
#define HIGH_ADDR (0x3UL << 48)
@@ -55,11 +57,19 @@
#define URING_QUEUE_SZ 1
#define URING_BLOCK_SZ 2048
/* Pasid test define */
#define LAM_CMD_BIT 0x1
#define PAS_CMD_BIT 0x2
#define SVA_CMD_BIT 0x4
#define PAS_CMD(cmd1, cmd2, cmd3) (((cmd3) << 8) | ((cmd2) << 4) | ((cmd1) << 0))
struct testcases {
unsigned int later;
int expected; /* 2: SIGSEGV Error; 1: other errors */
unsigned long lam;
uint64_t addr;
uint64_t cmd;
int (*test_func)(struct testcases *test);
const char *msg;
};
@@ -556,7 +566,7 @@ int do_uring(unsigned long lam)
struct file_io *fi;
struct stat st;
int ret = 1;
char path[PATH_MAX];
char path[PATH_MAX] = {0};
/* get current process path */
if (readlink("/proc/self/exe", path, PATH_MAX) <= 0)
@@ -852,6 +862,226 @@ static void cmd_help(void)
printf("\t-h: help\n");
}
/* Check for file existence */
uint8_t file_Exists(const char *fileName)
{
struct stat buffer;
uint8_t ret = (stat(fileName, &buffer) == 0);
return ret;
}
/* Sysfs idxd files */
const char *dsa_configs[] = {
"echo 1 > /sys/bus/dsa/devices/dsa0/wq0.1/group_id",
"echo shared > /sys/bus/dsa/devices/dsa0/wq0.1/mode",
"echo 10 > /sys/bus/dsa/devices/dsa0/wq0.1/priority",
"echo 16 > /sys/bus/dsa/devices/dsa0/wq0.1/size",
"echo 15 > /sys/bus/dsa/devices/dsa0/wq0.1/threshold",
"echo user > /sys/bus/dsa/devices/dsa0/wq0.1/type",
"echo MyApp1 > /sys/bus/dsa/devices/dsa0/wq0.1/name",
"echo 1 > /sys/bus/dsa/devices/dsa0/engine0.1/group_id",
"echo dsa0 > /sys/bus/dsa/drivers/idxd/bind",
/* bind files and devices, generated a device file in /dev */
"echo wq0.1 > /sys/bus/dsa/drivers/user/bind",
};
/* DSA device file */
const char *dsaDeviceFile = "/dev/dsa/wq0.1";
/* file for io*/
const char *dsaPasidEnable = "/sys/bus/dsa/devices/dsa0/pasid_enabled";
/*
* DSA depends on kernel cmdline "intel_iommu=on,sm_on"
* return pasid_enabled (0: disable 1:enable)
*/
int Check_DSA_Kernel_Setting(void)
{
char command[256] = "";
char buf[256] = "";
char *ptr;
int rv = -1;
snprintf(command, sizeof(command) - 1, "cat %s", dsaPasidEnable);
FILE *cmd = popen(command, "r");
if (cmd) {
while (fgets(buf, sizeof(buf) - 1, cmd) != NULL);
pclose(cmd);
rv = strtol(buf, &ptr, 16);
}
return rv;
}
/*
* Config DSA's sysfs files as shared DSA's WQ.
* Generated a device file /dev/dsa/wq0.1
* Return: 0 OK; 1 Failed; 3 Skip(SVA disabled).
*/
int Dsa_Init_Sysfs(void)
{
uint len = ARRAY_SIZE(dsa_configs);
const char **p = dsa_configs;
if (file_Exists(dsaDeviceFile) == 1)
return 0;
/* check the idxd driver */
if (file_Exists(dsaPasidEnable) != 1) {
printf("Please make sure idxd driver was loaded\n");
return 3;
}
/* Check SVA feature */
if (Check_DSA_Kernel_Setting() != 1) {
printf("Please enable SVA.(Add intel_iommu=on,sm_on in kernel cmdline)\n");
return 3;
}
/* Check the idxd device file on /dev/dsa/ */
for (int i = 0; i < len; i++) {
if (system(p[i]))
return 1;
}
/* After config, /dev/dsa/wq0.1 should be generated */
return (file_Exists(dsaDeviceFile) != 1);
}
/*
* Open DSA device file, triger API: iommu_sva_alloc_pasid
*/
void *allocate_dsa_pasid(void)
{
int fd;
void *wq;
fd = open(dsaDeviceFile, O_RDWR);
if (fd < 0) {
perror("open");
return MAP_FAILED;
}
wq = mmap(NULL, 0x1000, PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, 0);
if (wq == MAP_FAILED)
perror("mmap");
return wq;
}
int set_force_svm(void)
{
int ret = 0;
ret = syscall(SYS_arch_prctl, ARCH_FORCE_TAGGED_SVA);
return ret;
}
int handle_pasid(struct testcases *test)
{
uint tmp = test->cmd;
uint runed = 0x0;
int ret = 0;
void *wq = NULL;
ret = Dsa_Init_Sysfs();
if (ret != 0)
return ret;
for (int i = 0; i < 3; i++) {
int err = 0;
if (tmp & 0x1) {
/* run set lam mode*/
if ((runed & 0x1) == 0) {
err = set_lam(LAM_U57_BITS);
runed = runed | 0x1;
} else
err = 1;
} else if (tmp & 0x4) {
/* run force svm */
if ((runed & 0x4) == 0) {
err = set_force_svm();
runed = runed | 0x4;
} else
err = 1;
} else if (tmp & 0x2) {
/* run allocate pasid */
if ((runed & 0x2) == 0) {
runed = runed | 0x2;
wq = allocate_dsa_pasid();
if (wq == MAP_FAILED)
err = 1;
} else
err = 1;
}
ret = ret + err;
if (ret > 0)
break;
tmp = tmp >> 4;
}
if (wq != MAP_FAILED && wq != NULL)
if (munmap(wq, 0x1000))
printf("munmap failed %d\n", errno);
if (runed != 0x7)
ret = 1;
return (ret != 0);
}
/*
* Pasid test depends on idxd and SVA, kernel should enable iommu and sm.
* command line(intel_iommu=on,sm_on)
*/
static struct testcases pasid_cases[] = {
{
.expected = 1,
.cmd = PAS_CMD(LAM_CMD_BIT, PAS_CMD_BIT, SVA_CMD_BIT),
.test_func = handle_pasid,
.msg = "PASID: [Negative] Execute LAM, PASID, SVA in sequence\n",
},
{
.expected = 0,
.cmd = PAS_CMD(LAM_CMD_BIT, SVA_CMD_BIT, PAS_CMD_BIT),
.test_func = handle_pasid,
.msg = "PASID: Execute LAM, SVA, PASID in sequence\n",
},
{
.expected = 1,
.cmd = PAS_CMD(PAS_CMD_BIT, LAM_CMD_BIT, SVA_CMD_BIT),
.test_func = handle_pasid,
.msg = "PASID: [Negative] Execute PASID, LAM, SVA in sequence\n",
},
{
.expected = 0,
.cmd = PAS_CMD(PAS_CMD_BIT, SVA_CMD_BIT, LAM_CMD_BIT),
.test_func = handle_pasid,
.msg = "PASID: Execute PASID, SVA, LAM in sequence\n",
},
{
.expected = 0,
.cmd = PAS_CMD(SVA_CMD_BIT, LAM_CMD_BIT, PAS_CMD_BIT),
.test_func = handle_pasid,
.msg = "PASID: Execute SVA, LAM, PASID in sequence\n",
},
{
.expected = 0,
.cmd = PAS_CMD(SVA_CMD_BIT, PAS_CMD_BIT, LAM_CMD_BIT),
.test_func = handle_pasid,
.msg = "PASID: Execute SVA, PASID, LAM in sequence\n",
},
};
int main(int argc, char **argv)
{
int c = 0;
@@ -910,6 +1140,9 @@ int main(int argc, char **argv)
if (tests & FUNC_INHERITE)
run_test(inheritance_cases, ARRAY_SIZE(inheritance_cases));
if (tests & FUNC_PASID)
run_test(pasid_cases, ARRAY_SIZE(pasid_cases));
ksft_set_plan(tests_cnt);
return ksft_exit_pass();