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kvm: Common device control API functions

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Introduces two simple functions:
    int kvm_device_ioctl(int fd, int type, ...);
    int kvm_create_device(KVMState *s, uint64_t type, bool test);

These functions wrap the basic ioctl-based interactions with KVM in a
way similar to other KVM ioctl wrappers.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Message-id: 1392687720-26806-4-git-send-email-christoffer.dall@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Christoffer Dall 2014-02-26 17:20:00 +00:00 • committed by Peter Maydell
parent d6032e06d1
commit 0a6a7ccaae
3 changed files with 62 additions and 0 deletions
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39
kvm-all.c
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@ -1784,6 +1784,24 @@ int kvm_vcpu_ioctl(CPUState *cpu, int type, ...)
return ret;
}
int kvm_device_ioctl(int fd, int type, ...)
{
int ret;
void *arg;
va_list ap;
va_start(ap, type);
arg = va_arg(ap, void *);
va_end(ap);
trace_kvm_device_ioctl(fd, type, arg);
ret = ioctl(fd, type, arg);
if (ret == -1) {
ret = -errno;
}
return ret;
}
int kvm_has_sync_mmu(void)
{
return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
@ -2065,3 +2083,24 @@ int kvm_on_sigbus(int code, void *addr)
{
return kvm_arch_on_sigbus(code, addr);
}
int kvm_create_device(KVMState *s, uint64_t type, bool test)
{
int ret;
struct kvm_create_device create_dev;
create_dev.type = type;
create_dev.fd = -1;
create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0;
if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
return -ENOTSUP;
}
ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &create_dev);
if (ret) {
return ret;
}
return test ? 0 : create_dev.fd;
}