Re: [kvm-commits] kvm: kvmctl: create secondary vcpus

Re: [kvm-commits] kvm: kvmctl: create secondary vcpus

[Jun Koi]

So now we can have SMP guest with KVM? Great!

One thing I dont understand: I dont see where you unlock vcpu[n].sipi_sem?

Thanks,
Jun

On 6/5/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
> repository: /home/avi/kvm
> branch: master
> commit 61f2f77a6f11a08f06134c03e083713c78765509
> Author: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
> Date:   Mon Jun 4 19:04:14 2007 +0300
>
>     kvm: kvmctl: create secondary vcpus
>
> diff --git a/user/Makefile b/user/Makefile
> index dc5b5a6..6050bf9 100644
> --- a/user/Makefile
> +++ b/user/Makefile
> @@ -32,6 +32,8 @@ endif
>
>  all: kvmctl libkvm.a flatfiles
>
> +kvmctl: LDFLAGS += -pthread -lrt
> +
>  kvmctl: kvmctl.o main.o
>
>  balloon_ctl: balloon_ctl.o
> diff --git a/user/main.c b/user/main.c
> index 41fc288..2e0a41f 100644
> --- a/user/main.c
> +++ b/user/main.c
> @@ -21,9 +21,33 @@
>  #include <fcntl.h>
>  #include <stdlib.h>
>  #include <string.h>
> +#include <semaphore.h>
> +#include <sys/types.h>
> +#include <errno.h>
> +#include <pthread.h>
> +#include <sys/syscall.h>
> +#include <linux/unistd.h>
> +
> +
> +static int gettid(void)
> +{
> +    return syscall(__NR_gettid);
> +}
>
>  kvm_context_t kvm;
>
> +#define MAX_VCPUS 4
> +
> +static int ncpus = 1;
> +static sem_t init_sem;
> +
> +struct vcpu_info {
> +    pid_t tid;
> +    sem_t sipi_sem;
> +};
> +
> +struct vcpu_info *vcpus;
> +
>  static int test_inb(void *opaque, uint16_t addr, uint8_t *value)
>  {
>      printf("inb 0x%x\n", addr);
> @@ -171,6 +195,33 @@ static void enter_32(kvm_context_t kvm)
>      kvm_set_sregs(kvm, 0, &sregs);
>  }
>
> +static void init_vcpu(int n)
> +{
> +    vcpus[n].tid = gettid();
> +    sem_post(&init_sem);
> +}
> +
> +static void *do_create_vcpu(void *_n)
> +{
> +    int n = (long)_n;
> +
> +    kvm_create_vcpu(kvm, n);
> +    init_vcpu(n);
> +    printf("vcpu %d: waiting for sipi\n", n);
> +    sem_wait(&vcpus[n].sipi_sem);
> +    printf("vcpu %d: running\n", n);
> +    kvm_run(kvm, n);
> +    return NULL;
> +}
> +
> +static void start_vcpu(int n)
> +{
> +    pthread_t thread;
> +
> +    sem_init(&vcpus[n].sipi_sem, 0, 0);
> +    pthread_create(&thread, NULL, do_create_vcpu, (void *)(long)n);
> +}
> +
>  const char *progname;
>
>  static void usage()
> @@ -191,7 +242,7 @@ static int isarg(const char *arg, const char *longform, const char *shortform)
>  int main(int ac, char **av)
>  {
>         void *vm_mem;
> -       int ncpus = 1;
> +       int i;
>
>         progname = av[0];
>         while (ac > 1 && av[1][0] =='-') {
> @@ -207,6 +258,12 @@ int main(int ac, char **av)
>             ++av, --ac;
>         }
>
> +       vcpus = calloc(ncpus, sizeof *vcpus);
> +       if (!vcpus) {
> +           fprintf(stderr, "calloc failed\n");
> +           return 1;
> +       }
> +
>         kvm = kvm_init(&test_callbacks, 0);
>         if (!kvm) {
>             fprintf(stderr, "kvm_init failed\n");
> @@ -226,6 +283,12 @@ int main(int ac, char **av)
>         if (ac > 2)
>             load_file(vm_mem + 0x100000, av[2]);
>
> +       sem_init(&init_sem, 0, 1 - ncpus);
> +       init_vcpu(0);
> +       for (i = 1; i < ncpus; ++i)
> +           start_vcpu(i);
> +       sem_wait(&init_sem);
> +
>         kvm_run(kvm, 0);
>
>         return 0;
>
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Re: [kvm-commits] kvm: kvmctl: create secondary vcpus

[Avi Kivity]

Jun Koi wrote:
> So now we can have SMP guest with KVM? Great!
>

It's not done yet.

> One thing I dont understand: I dont see where you unlock 
> vcpu[n].sipi_sem?
>

That's still cooking.  I've written small pseudo apic which can issue 
the sipi.

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


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Re: [kvm-commits] kvm: kvmctl: create secondary vcpus

[Nguyen Anh Quynh]

Hi Avi,

Perhaps I miss something, but I dont see you initialize ncpus anywhere
in the patch?

Cheers,
Quynh

On 6/5/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
> repository: /home/avi/kvm
> branch: master
> commit 9d02d1c4345c77ffbc95136c12011a112a8d1c7e
> Author: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
> Date:   Mon Jun 4 19:04:14 2007 +0300
>
>     kvm: kvmctl: create secondary vcpus
>
> diff --git a/user/Makefile b/user/Makefile
> index dc5b5a6..6050bf9 100644
> --- a/user/Makefile
> +++ b/user/Makefile
> @@ -32,6 +32,8 @@ endif
>
>  all: kvmctl libkvm.a flatfiles
>
> +kvmctl: LDFLAGS += -pthread -lrt
> +
>  kvmctl: kvmctl.o main.o
>
>  balloon_ctl: balloon_ctl.o
> diff --git a/user/main.c b/user/main.c
> index 41fc288..f5b3838 100644
> --- a/user/main.c
> +++ b/user/main.c
> @@ -21,9 +21,33 @@
>  #include <fcntl.h>
>  #include <stdlib.h>
>  #include <string.h>
> +#include <semaphore.h>
> +#include <sys/types.h>
> +#include <errno.h>
> +#include <pthread.h>
> +#include <sys/syscall.h>
> +#include <linux/unistd.h>
> +
> +
> +static int gettid(void)
> +{
> +    return syscall(__NR_gettid);
> +}
>
>  kvm_context_t kvm;
>
> +#define MAX_VCPUS 4
> +
> +static int ncpus;
> +static sem_t init_sem;
> +
> +struct vcpu_info {
> +    pid_t tid;
> +    sem_t sipi_sem;
> +};
> +
> +struct vcpu_info *vcpus;
> +
>  static int test_inb(void *opaque, uint16_t addr, uint8_t *value)
>  {
>      printf("inb 0x%x\n", addr);
> @@ -171,6 +195,33 @@ static void enter_32(kvm_context_t kvm)
>      kvm_set_sregs(kvm, 0, &sregs);
>  }
>
> +static void init_vcpu(int n)
> +{
> +    vcpus[n].tid = gettid();
> +    sem_post(&init_sem);
> +}
> +
> +static void *do_create_vcpu(void *_n)
> +{
> +    int n = (long)_n;
> +
> +    kvm_create_vcpu(kvm, n);
> +    init_vcpu(n);
> +    printf("vcpu %d: waiting for sipi\n", n);
> +    sem_wait(&vcpus[n].sipi_sem);
> +    printf("vcpu %d: running\n", n);
> +    kvm_run(kvm, n);
> +    return NULL;
> +}
> +
> +static void start_vcpu(int n)
> +{
> +    pthread_t thread;
> +
> +    sem_init(&vcpus[n].sipi_sem, 0, 0);
> +    pthread_create(&thread, NULL, do_create_vcpu, (void *)(long)n);
> +}
> +
>  const char *progname;
>
>  static void usage()
> @@ -191,7 +242,7 @@ static int isarg(const char *arg, const char *longform, const char *shortform)
>  int main(int ac, char **av)
>  {
>         void *vm_mem;
> -       int ncpus = 1;
> +       int i;
>
>         progname = av[0];
>         while (ac > 1 && av[1][0] =='-') {
> @@ -207,6 +258,12 @@ int main(int ac, char **av)
>             ++av, --ac;
>         }
>
> +       vcpus = calloc(ncpus, sizeof *vcpus);
> +       if (!vcpus) {
> +           fprintf(stderr, "calloc failed\n");
> +           return 1;
> +       }
> +
>         kvm = kvm_init(&test_callbacks, 0);
>         if (!kvm) {
>             fprintf(stderr, "kvm_init failed\n");
> @@ -226,6 +283,12 @@ int main(int ac, char **av)
>         if (ac > 2)
>             load_file(vm_mem + 0x100000, av[2]);
>
> +       sem_init(&init_sem, 0, 1 - ncpus);
> +       init_vcpu(0);
> +       for (i = 1; i < ncpus; ++i)
> +           start_vcpu(i);
> +       sem_wait(&init_sem);
> +
>         kvm_run(kvm, 0);
>
>         return 0;
>
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Re: [kvm-commits] kvm: kvmctl: create secondary vcpus

[Avi Kivity]

Nguyen Anh Quynh wrote:
> Hi Avi,
>
> Perhaps I miss something, but I dont see you initialize ncpus anywhere
> in the patch?
>

Good catch.  Fixed.

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


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