Re: [Qemu-devel] [PATCH] apic: test tsc deadline timer

[Avi Kivity]

On 10/09/2011 12:05 PM, Liu, Jinsong wrote:
> Marcelo,
>
> I add test case for tsc deadline timer 
> https://github.com/avikivity/kvm-unit-tests, as attached.
>
> According to the kvm-unit-tests README, I try to run
> qemu-system-x86_64 -device testdev,chardev=testlog -chardev 
> file,id=testlog,path=apic.out -kernel ./x86/apic.flat
> but get nothing from the testlog 'apic.out'
> (BTW, at kvm side I did observe the expected tsc deadline timer action)
>
> I also try to run the README example
> qemu-system-x86_64 -device testdev,chardev=testlog -chardev 
> file,id=testlog,path=msr.out -kernel ./x86/msr.flat
> but still get nothing from 'msr.out'
>
> Do I miss something? how can I get test log?

This was recently changed, it now outputs to the serial port.

Try


qemu-system-x86_64 -device testdev,chardev=testlog -chardev 
file,id=testlog,path=apic.out -serial stdio -kernel ./x86/apic.flat


> +
> +static void start_tsc_deadline_timer(void)
> +{
> +    unsigned a, d;
> +
> +    handle_irq(TSC_DEADLINE_TIMER_VECTOR, tsc_deadline_timer_isr);
> +    irq_enable();
> +
> +    asm ("rdmsr" : "=a"(a), "=d"(d) : "c"(MSR_IA32_TSC));
> +    asm ("wrmsr" : : "a"(a), "d"(d), "c"(MSR_IA32_TSCDEADLINE));
> +    asm volatile ("nop");
> +    report("tsc deadline timer", tdt_count == 1);
> +}

Please use rdmsr()/wrmsr() from processor.h.

> +
> +static int enable_tsc_deadline_timer(void)
> +{
> +    unsigned a, b, c, d;
> +    uint32_t lvtt;
> +
> +    asm ("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(1));

cpuid()...

> +
> +    if (c&  (1<<  24)) {
> +        lvtt = TSC_DEADLINE_TIMER_MODE | TSC_DEADLINE_TIMER_VECTOR;
> +        apic_write(APIC_LVTT, lvtt);
> +        start_tsc_deadline_timer();
> +        return 1;
> +    } else {
> +        return 0;
> +    }
> +}
> +
> +static void test_tsc_deadline_timer(void)
> +{
> +    if(enable_tsc_deadline_timer()) {
> +        printf("tsc deadline timer enabled\n");
> +    } else {
> +        printf("tsc deadline timer not detected\n");
> +    }
> +}
> +
>   #define MSR_APIC_BASE 0x0000001b
>
>   void test_enable_x2apic(void)
> @@ -291,6 +342,8 @@ int main()
>       test_sti_nmi();
>       test_multiple_nmi();
>
> +    test_tsc_deadline_timer();
> +
>       printf("\nsummary: %d tests, %d failures\n", g_tests, g_fail);
>
>       return g_fail != 0;


--
error compiling committee.c: too many arguments to function