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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/2][XTF] xtf/vpmu: MSR read/write tests for VPMU
This patch tests VPMU functionality in the hypervisor on Intel machines.
The tests write to all valid bits in the MSRs that get exposed to the guests
when VPMU is enabled. The tests also write invalid values to the bits
that should be masked and expect the wrmsr call to fault.
The tests are currently unsupported for AMD machines and PV guests.
Signed-off-by: Mohit Gambhir <mohit.gambhir@xxxxxxxxxx>
---
tests/vpmu/Makefile | 9 +
tests/vpmu/main.c | 502 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 511 insertions(+)
create mode 100644 tests/vpmu/Makefile
create mode 100644 tests/vpmu/main.c
diff --git a/tests/vpmu/Makefile b/tests/vpmu/Makefile
new file mode 100644
index 0000000..1eaf436
--- /dev/null
+++ b/tests/vpmu/Makefile
@@ -0,0 +1,9 @@
+include $(ROOT)/build/common.mk
+
+NAME := vpmu
+CATEGORY := utility
+TEST-ENVS := $(ALL_ENVIRONMENTS)
+
+obj-perenv += main.o
+
+include $(ROOT)/build/gen.mk
diff --git a/tests/vpmu/main.c b/tests/vpmu/main.c
new file mode 100644
index 0000000..849c30a
--- /dev/null
+++ b/tests/vpmu/main.c
@@ -0,0 +1,502 @@
+/**
+ * @file tests/vpmu/main.c
+ * @ref test-vpmu
+ *
+ * @page test-vpmu vpmu
+ *
+ * Test MSRs exposed by VPMU for various versions of Architectural Performance
+ * Monitoring Unit
+ *
+ * @see tests/vpmu/main.c
+ */
+
+#include <xtf.h>
+#include <arch/msr-index.h>
+#include <arch/mm.h>
+
+#define EVENT_UOPS_RETIRED 0x004101c2
+#define EVENT_UOPS_RETIRED_ANYTHREAD 0x006101c2
+#define FIXED_CTR_CTL_BITS 4
+#define FIXED_CTR_ENABLE 0x0000000A
+#define FIXED_CTR_ENABLE_ANYTHREAD 0x0000000E
+#define IA32_PERFEVENTSELx_ENABLE_ANYTHREAD (1ull << 21)
+#define IA32_PERFEVENTSELx_ENABLE_PCB (1ull << 19)
+#define IA32_DEBUGCTL_Freeze_LBR_ON_PMI (1ull << 11)
+#define IA32_DEBUGCTL_Freeze_PerfMon_On_PMI (1ull << 12)
+
+const char test_title[] = "Test vpmu";
+
+static void get_intel_pmu_version(uint8_t *v, uint8_t *ng, uint8_t *nf,
+ uint8_t *ngb)
+{
+ /* Inter Software Development Manual Vol 2A
+ * Table 3-8 Information Returned by CPUID Instruction */
+
+ uint32_t leaf = 0x0a, subleaf = 0;
+
+ uint32_t eax, ebx, ecx, edx;
+
+ cpuid_count(leaf, subleaf, &eax, &ebx, &ecx, &edx);
+
+ /* Extract the version ID - EAX 7:0 */
+ *v = (eax & 0xff);
+
+ /* Extract number of general purpose counter regs - EAX 15:8 */
+ *ng = (eax >> 8) & 0xff;
+
+ /* Extract number of fixed function counter regs - EDX 4:0 */
+ *nf = edx & 0x1f;
+
+ /* Extract number of bits in general purpose counter registers bits */
+ *ngb = (eax >> 16) & 0xff;
+}
+
+static bool test_valid_msr_write(uint32_t idx, uint64_t wval)
+{
+ const char *pfx = "Error: test_valid_msr_write:";
+
+ uint64_t rval = 0;
+
+ printk("Writing 0x%" PRIx64 " to MSR 0x%x\n", wval, idx);
+
+ if( wrmsr_safe(idx, wval) )
+ {
+ xtf_error("%s wrmsr for MSR 0x%x resulted in a fault!\n", pfx, idx);
+ return false;
+ }
+
+ /* check to see if the values were written correctly */
+ if ( rdmsr_safe(idx, &rval) )
+ {
+ xtf_error("%s rdmsr for MSR 0x%x resulted in a fault!\n", pfx, idx);
+ return false;
+ }
+ if ( rval != wval )
+ {
+ xtf_error("%s rdmsr value mismatch for MSR 0x%x Expected: %"PRIx64
+ ", Found %"PRIx64"\n", pfx, idx, wval, rval);
+ return false;
+ }
+
+ return true;
+}
+
+static bool test_invalid_msr_write(uint32_t idx, uint64_t wval)
+{
+ printk("Write invalid value %"PRIx64" to MSR 0x%x\n", wval, idx);
+
+ /* wrmsr_safe must return false after faulting */
+ if( !wrmsr_safe(idx, wval) )
+ {
+ xtf_error("Error: test_invalid_msr_write wrmsr for MSR 0x%x did not "
+ "fault!\n", idx);
+ return false;
+ }
+
+ printk("wrmsr to MSR 0x%x faulted as expected.\n", idx);
+
+ return true;
+}
+
+static bool test_transparent_msr_write(uint32_t idx, uint64_t wval)
+{
+ const char *pfx = "Error: test_transparent_msr_write:";
+
+ uint64_t rval1 = 0;
+
+ uint64_t rval2 = 0;
+
+ printk("Attempting to write a value with no effect to MSR 0x%x\n", idx);
+
+ /* read current value */
+ if ( rdmsr_safe(idx, &rval1) )
+ {
+ xtf_error("%s rdmsr for MSR 0x%x resulted in a fault\n", pfx, idx);
+ return false;
+ }
+
+ /* wrmsr should not fault but should not write anything either */
+ if ( wrmsr_safe(idx, wval) )
+ {
+ xtf_error("%s wrmsr for MSR 0x%x resulted in a fault\n", pfx, idx);
+ return false;
+ }
+
+ /* read new value */
+ if ( rdmsr_safe(idx, &rval2) )
+ {
+ xtf_error("%s rdmsr for MSR 0x%x resulted in a fault\n", pfx, idx);
+ return false;
+ }
+
+ /* Check if the new value is the same as the one before wrmsr */
+
+ if ( rval1 != rval2 )
+ {
+ xtf_error("%s rdmsr value mismatch for MSR 0x%x Expected %"PRIx64
+ ". Found %"PRIx64"\n", pfx, idx, rval1, rval2);
+ return false;
+ }
+
+ return true;
+}
+
+static bool test_intel_pmu_ver1(uint8_t ng)
+{
+ /* Intel Sofwtare Development Manual Vol. 3B,
+ * Section 18.2.1 - Architectural Performance Monitoring Version 1
+ *
+ * MSRs made available by the VPMU -
+ *
+ * IA32_PMCx (start at address 0xc1)
+ * IA32_PERFEVENTSELx (start at address 0x186)
+ */
+
+ uint32_t idx;
+
+ uint64_t wval = 0;
+
+ uint8_t i;
+
+ printk("-----------------\n");
+ printk("Testing version 1\n");
+ printk("-----------------\n");
+
+ /* for all general purpose counters */
+ for ( i = 0; i < ng; i++ )
+ {
+ /* test writing to IA32_PMCx */
+ idx = MSR_IA32_PMC(i);
+
+ /* test we can write to all valid bits in the counters */
+ /* don't set bit 31 since that gets sign-extended */
+ wval = ((1ull << 31) - 1) ;
+
+ if ( !test_valid_msr_write(idx, wval) )
+ return false;
+
+ /* set all valid bits in MSR_IA32_EVENTSELx */
+ idx = MSR_IA32_PERFEVTSEL(i);
+ wval = ((1ull << 32) - 1) ^ (IA32_PERFEVENTSELx_ENABLE_ANYTHREAD |
+ IA32_PERFEVENTSELx_ENABLE_PCB);
+
+ if ( !test_valid_msr_write(idx, wval) )
+ return false;
+
+ /* test writing an invalid value and assert that it faults */
+ wval = ~((1ull << 32) - 1);
+
+ if ( !test_invalid_msr_write(idx, wval) )
+ return false;
+ }
+
+ return true;
+}
+
+static bool test_intel_pmu_ver2(uint8_t ng, uint8_t nf)
+{
+ /* Intel Sofwtare Development Manual Vol. 3B,
+ * Section 18.2.2 - Architectural Performance Monitoring Version 2
+ *
+ * MSRs made available by the VPMU -
+ *
+ * IA32_FIXED_CTRx (start at address 0x309)
+ * IA32_FIXED_CTR_CTRL
+ * IA32_PERF_GLOBAL_CTRL
+ * IA32_PERF_GLOBAL_STATUS (read-only)
+ * IA32_PERF_GLOBAL_OVF_CTRL
+ * IA32_DEBUGCTL_Freeze_LBR_ON_PMI
+ * IA32_DEBUGCTL_Freeze_PerfMon_On_PMI
+ */
+
+ uint32_t idx;
+
+ uint64_t wval, rval;
+
+ uint8_t i;
+
+ printk("-----------------\n");
+ printk("Testing version 2\n");
+ printk("-----------------\n");
+
+ for ( i = 0; i < nf; i++ )
+ {
+ /* test writing to IA32_FIXED_CTRx */
+ idx = MSR_IA32_FIXED_CTR(i);
+
+ wval = (1ull << 32) - 1;
+
+ if ( !test_valid_msr_write(idx, wval) )
+ return false;
+
+ /* test invalid write to IA32_FIXED_CTRx */
+ wval = ~wval;
+
+ if ( !test_invalid_msr_write(idx, wval) )
+ return false;
+ }
+
+ /* test IA32_FIXED_CTR_CTRL */
+ idx = MSR_IA32_FIXED_CTR_CTRL;
+
+ /* enable all fixed counters */
+ wval = 0;
+
+ for ( i = 0; i < nf; i++ )
+ wval |= (FIXED_CTR_ENABLE << (FIXED_CTR_CTL_BITS * i));
+
+ if ( !test_valid_msr_write(idx, wval) )
+ return false;
+
+ /* invert wval to test writing an invalid value */
+ wval = ~wval;
+
+ if ( !test_invalid_msr_write(idx, wval) )
+ return false;
+
+ /* test IA32_PERF_GLOBAL_CTRL */
+ idx = MSR_IA32_PERF_GLOBAL_CTRL;
+
+ wval = 0;
+
+ /* set all fixed function counters enable bits */
+ for ( i=0; i < nf; i ++ )
+ wval |= ((uint64_t)1 << (32 + i));
+
+ /* set all general purpose counters enable bits*/
+ for ( i = 0; i < ng; i++ )
+ wval |= (1 << i);
+
+ if ( !test_valid_msr_write(idx, wval) )
+ return false;
+
+ /* invert wval to test invalid write to MSR_IA32_PERF_GLOBAL_CTRL*/
+ wval = ~wval;
+
+ if ( !test_invalid_msr_write(idx, wval) )
+ return false;
+
+ /* test IA32_PERF_GLOBAL_OVF_CTRL */
+ idx = MSR_IA32_PERF_GLOBAL_OVF_CTRL;
+
+ /* set all valid bits in MSR_IA32_PERF_GLOBAL_OVF_CTRL */
+ wval = 0xC000000000000000 | (((1ULL << nf) - 1) << 32) | ((1ULL << ng) -
1);
+
+ /* Writing to MSR_IA32_PERF_GLOBAL_OVF_CTRL clears
+ * MSR_IA32_PERF_GLOBAL_STATUS but but always returns 0 when read so
+ * it is tested as a transparent write */
+
+ if ( !test_transparent_msr_write(idx, wval) )
+ return false;
+
+ /* invert wval to test invalid write to MSR_IA32_PERF_GLOBAL_OVF_CTRL*/
+ wval = ~wval;
+
+ if ( !test_invalid_msr_write(idx, wval) )
+ return false;
+
+ /* test IA32_PERF_GLOBAL_STATUS (read-only) */
+ idx = MSR_IA32_PERF_GLOBAL_STATUS;
+
+ if ( rdmsr_safe(idx, &rval) )
+ {
+ xtf_error("Error: test_intel_pmu_ver2: "
+ "rdmsr_safe for MSR 0x%x resulted in a fault!\n", idx);
+ return false;
+ }
+
+ /* try to write the IA32_PERF_GLOBAL_STATUS register and expect it to
fail*/
+ if ( !test_invalid_msr_write(idx, rval) )
+ return false;
+
+
+ /* test IA32_DEBUGCTL */
+ idx = MSR_IA32_DEBUGCTL;
+
+ /* Test IA32_DEBUGCTL facilities enabled by v2 */
+ wval = IA32_DEBUGCTL_Freeze_LBR_ON_PMI |
IA32_DEBUGCTL_Freeze_PerfMon_On_PMI;
+
+ /* FIXME: This should really be a valid write but it isnt supported by the
+ * VPMU yet */
+ if ( !test_transparent_msr_write(idx, wval) )
+ return false;
+
+ return true;
+}
+
+static bool test_intel_pmu_ver3(uint8_t ng, uint8_t nf)
+{
+ /* Intel Sofwtare Development Manual Vol. 3B
+ * Section 18.2.3 Architectural Performance Monitoring Version 3
+ *
+ * MSRs made available by the VPMU
+ *
+ * IA32_PERFEVENTSELx.ANYTHREAD (Bit 21)
+ * IA32_FIXED_CTR_CTRL.ANYTHREADx (Bit 2, 6, 11)
+ *
+ * Version 3 introduces ANYTHREAD bit but VPMU does not support it to
+ * ensure that a VCPU isn't able to read values from physical resources
that
+ * are not allocated to it. This test case validates that we are unable to
+ * write to .ANYTHREAD bit in IA32_PERFEVENTSELx and IA32_FIXED_CTR_CTRL
+ */
+
+ uint64_t wval;
+
+ uint32_t idx;
+
+ uint8_t i;
+
+ printk("-----------------\n");
+ printk("Testing version 3\n");
+ printk("-----------------\n");
+
+ /* test IA32_PERFEVENTSELx.ANYTHREAD is disabled */
+ for ( i = 0; i < ng; i++ )
+ {
+ idx = MSR_IA32_PERFEVTSEL(i);
+
+ wval = EVENT_UOPS_RETIRED_ANYTHREAD;
+
+ if ( !test_invalid_msr_write(idx, wval) )
+ return false;
+ }
+
+
+ /* test IA32_FIXED_CTR_CTL.ANYTHREAD is disabled */
+ idx = MSR_IA32_FIXED_CTR_CTRL;
+
+ wval = 0;
+
+ for ( i = 0; i < nf; i++ )
+ wval |= (FIXED_CTR_ENABLE_ANYTHREAD << (4 * i)) ;
+
+ if ( !test_invalid_msr_write(idx, wval) )
+ return false;
+
+ return true;
+}
+
+static bool test_full_width_cnts(uint8_t ng, uint8_t ngb)
+{
+ uint64_t caps;
+
+ uint32_t idx;
+
+ uint64_t wval;
+
+ uint8_t i;
+
+ /* Get perf capabilties */
+ if ( rdmsr_safe(MSR_IA32_PERF_CAPABILITIES, &caps) )
+ {
+ printk("Fault while reading MSR_IA32_PERF_CAPABILITIES\n");
+ return false;
+ }
+
+ if ( !(caps >> 13) & 1 )
+ {
+ printk("Full width counters not supported\n");
+ return true;
+ }
+
+ /* test writes to full width counters */
+ for ( i = 0; i < ng; i++)
+ {
+ idx = MSR_IA32_A_PMC(i);
+
+ wval = ((1ull << ngb) - 1) ;
+
+ if ( !test_valid_msr_write(idx, wval) )
+ return false;
+
+ /* invert wval to test invalid write to MSR_IA32_PERF_GLOBAL_OVF_CTRL*/
+ wval = ~wval;
+
+ if ( !test_invalid_msr_write(idx, wval) )
+ return false;
+ }
+
+ return true;
+
+}
+
+void test_main(void)
+{
+ /* Architectural Performance Monitoring Version */
+ uint8_t ver;
+
+ /* Number of general purpose counter registers */
+ uint8_t ngregs;
+
+ /* Number of fixed function counter registers */
+ uint8_t nfregs;
+
+ /* Bit width of general-purpose, performance monitoring counter */
+ uint8_t ngbits;
+
+ if ( IS_DEFINED(CONFIG_PV) )
+ {
+ printk("VPMU testing for PV guests currently unsupported\n");
+ goto out;
+ }
+
+ if ( vendor_is_amd )
+ {
+ printk("VPMU testing for AMD currently unsupported\n");
+ goto out;
+ }
+
+ get_intel_pmu_version(&ver, &ngregs, &nfregs, &ngbits);
+
+ printk("Ver=%u: GPR=%u: FFR=%x GPB=%u\n", ver, ngregs, nfregs, ngbits);
+
+ switch (ver)
+ {
+
+ case 4:
+ /* version 4 facilities are not supported
+ * VPMU emulates version 3 */
+ /* fall through */
+
+ case 3:
+ /* test version 3 facilities */
+ if ( !test_intel_pmu_ver3( ngregs, nfregs) )
+ return xtf_failure("Fail: Failed VPMU version 3\n");
+ /* fall through */
+
+ case 2:
+ /* test version 2 facilities */
+ if ( !test_intel_pmu_ver2(ngregs, nfregs) )
+ return xtf_failure("Fail: Failed VPMU version 2\n");
+
+ /* test version 1 facilities */
+ if ( !test_intel_pmu_ver1(ngregs) )
+ return xtf_failure("Fail: Failed VPMU version 1\n");
+
+ /* test full width counters */
+ if ( !test_full_width_cnts(ngregs, ngbits) )
+ return xtf_failure("Fail: Failed full width test\n");
+
+ break;
+
+ case 1:
+ /* version 1 unsupported */
+
+ default:
+ printk("VMPU not supported!\n");
+ goto out;
+ }
+
+out:
+ return xtf_success(NULL);
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
2.9.3
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