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Resend - Added x86/tsc_adjust.c to test the ia32_tsc_adjust funtionality.

PATCH In review Will Auld 2 participants 2 messages Nov 26, 2012 – Nov 28, 2012 KVM

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Will Auld

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#0 lore raw

PATCH 1/1 Resend - Added x86/tsc_adjust.c to test the ia32_tsc_adjust funtionality.

Signed-off-by Will Auld <[email protected]>
---
 config-x86-common.mak |  5 ++++-
 x86/tsc_adjust.c      | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 x86/tsc_adjust.c
config-x86-common.mak +4 -1
index c76cd11..47a9056 100644
@@ -34,7 +34,8 @@ tests-common = $(TEST_DIR)/vmexit.flat $(TEST_DIR)/tsc.flat \
                $(TEST_DIR)/realmode.flat $(TEST_DIR)/msr.flat \
                $(TEST_DIR)/hypercall.flat $(TEST_DIR)/sieve.flat \
                $(TEST_DIR)/kvmclock_test.flat  $(TEST_DIR)/eventinj.flat \
-               $(TEST_DIR)/s3.flat $(TEST_DIR)/pmu.flat $(TEST_DIR)/asyncpf.flat
+               $(TEST_DIR)/s3.flat $(TEST_DIR)/pmu.flat \
+	       $(TEST_DIR)/tsc_adjust.flat $(TEST_DIR)/asyncpf.flat
 
 ifdef API
 tests-common += api/api-sample

@@ -64,6 +65,8 @@ $(TEST_DIR)/port80.elf: $(cstart.o) $(TEST_DIR)/port80.o
 
 $(TEST_DIR)/tsc.elf: $(cstart.o) $(TEST_DIR)/tsc.o
 
+$(TEST_DIR)/tsc_adjust.elf: $(cstart.o) $(TEST_DIR)/tsc_adjust.o
+
 $(TEST_DIR)/apic.elf: $(cstart.o) $(TEST_DIR)/apic.o
 
 $(TEST_DIR)/realmode.elf: $(TEST_DIR)/realmode.o
x86/tsc_adjust.c new file +43 -0

43 lines not on this page · raw message

Signature · 1 line
1.8.0.rc0
#1 lore raw

Will,

1. Please check CPUID before using ADJUST_TSC MSR, exit test successfully if CPUID bit disabled.

2. Please test the implementation of ADJUST_TSC MSR (functional test). vmexit.flat test can be used for performance of MSR emulation.

Example

	tsc1 = rdtsc();
	wrmsr(IA32_TSC_ADJUST, 100000000000ull);
	tsc2 = rdtsc();
	if (tsc2 - tsc1 < 100000000000ull) {
		printf("failure ... should be ...");
		failure++;
	}
	...
	write to tsc
	check if IA32_TSC_ADJUST is adjusted accordingly

	return !failure ? 0 : 1;

Thanks

Quoted 88 lines · Will Auld
Signed-off-by Will Auld <[email protected]>
---
 config-x86-common.mak |  5 ++++-
 x86/tsc_adjust.c      | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 x86/tsc_adjust.c
config-x86-common.mak +4 -1
index c76cd11..47a9056 100644
@@ -34,7 +34,8 @@ tests-common = $(TEST_DIR)/vmexit.flat $(TEST_DIR)/tsc.flat \
                $(TEST_DIR)/realmode.flat $(TEST_DIR)/msr.flat \
                $(TEST_DIR)/hypercall.flat $(TEST_DIR)/sieve.flat \
                $(TEST_DIR)/kvmclock_test.flat  $(TEST_DIR)/eventinj.flat \
-               $(TEST_DIR)/s3.flat $(TEST_DIR)/pmu.flat $(TEST_DIR)/asyncpf.flat
+               $(TEST_DIR)/s3.flat $(TEST_DIR)/pmu.flat \
+	       $(TEST_DIR)/tsc_adjust.flat $(TEST_DIR)/asyncpf.flat
 
 ifdef API
 tests-common += api/api-sample

@@ -64,6 +65,8 @@ $(TEST_DIR)/port80.elf: $(cstart.o) $(TEST_DIR)/port80.o
 
 $(TEST_DIR)/tsc.elf: $(cstart.o) $(TEST_DIR)/tsc.o
 
+$(TEST_DIR)/tsc_adjust.elf: $(cstart.o) $(TEST_DIR)/tsc_adjust.o
+
 $(TEST_DIR)/apic.elf: $(cstart.o) $(TEST_DIR)/apic.o
 
 $(TEST_DIR)/realmode.elf: $(TEST_DIR)/realmode.o
x86/tsc_adjust.c new file +43 -0
new file mode 100644
index 0000000..bcb8982
@@ -0,0 +1,43 @@
+#include "libcflat.h"
+#include "processor.h"
+
+#define IA32_TSC_ADJUST 0x3b
+
+int main()
+{
+	u64 t1, t2, t3, t4, t5;
+	u64 lat;
+
+	t3 = 0x0;
+
+	t1 = rdtsc();
+	wrmsr(IA32_TSC_ADJUST, t3);
+	t2 = rdtsc();
+	lat = t2 - t1;
+	printf("rdtsc/wrmsr/rdtsc latency %lld\n", lat);
+	printf("Initial rdtsc: %lld\n", t2);
+
+	t1 = rdmsr(IA32_TSC_ADJUST);
+	printf("Initial rdmsr IA32_TSC_ADJUST: %lld\n", t1);
+	
+	t5 = 100000000000ull;
+	wrtsc(t5);
+	t1 = rdmsr(IA32_TSC_ADJUST);
+	printf("wrtsc %lld, rdmsr IA32_TSC_ADJUST: %lld\n", t5, t1);
+
+	wrmsr(IA32_TSC_ADJUST, t3);
+	t2 = rdtsc();
+	t1 = rdmsr(IA32_TSC_ADJUST);
+	printf( "wrmsr IA32_TSC_ADJUST %lld, rdmsr IA32_TSC_ADJUST: %lld, rdtsc: %lld\n", t3, t1, t2);
+	
+	t3 = 0xffff;
+	t4 = rdtsc();
+	wrmsr(IA32_TSC_ADJUST, t3);
+	t2 = rdtsc();
+	t1 = rdmsr(IA32_TSC_ADJUST);
+	printf( "wrmsr IA32_TSC_ADJUST %lld, rdmsr IA32_TSC_ADJUST: %lld, rdtsc: %lld\n", t3, t1, t2);
+	lat = t2 - t4;
+	printf("rdtsc/wrmsr/rdtsc latency %lld\n", lat);
+	
+	return 0;
+}
Signature · 8 lines
1.8.0.rc0



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