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kvm: add kvm_device_supported() helper function

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This can be used when probing whether KVM support specific device. Here,
a raw vmfd is used.

Signed-off-by: Peter Xu <peterx@redhat.com>
Acked-by: Sergey Fedorov <serge.fdrv@gmail.com>
Message-id: 1458788142-17509-4-git-send-email-peterx@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Xu 2016-03-30 17:27:24 +01:00 committed by Peter Maydell
parent 2f340e9c24
commit 29039acf58
2 changed files with 24 additions and 0 deletions
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9
include/sysemu/kvm.h
View File

@ -306,6 +306,15 @@ void kvm_device_access(int fd, int group, uint64_t attr,
*/
int kvm_create_device(KVMState *s, uint64_t type, bool test);
/**
* kvm_device_supported - probe whether KVM supports specific device
*
* @vmfd: The fd handler for VM
* @type: type of device
*
* @return: true if supported, otherwise false.
*/
bool kvm_device_supported(int vmfd, uint64_t type);
/* Arch specific hooks */

15
kvm-all.c
View File

@ -2339,6 +2339,21 @@ int kvm_create_device(KVMState *s, uint64_t type, bool test)
return test ? 0 : create_dev.fd;
}
bool kvm_device_supported(int vmfd, uint64_t type)
{
struct kvm_create_device create_dev = {
.type = type,
.fd = -1,
.flags = KVM_CREATE_DEVICE_TEST,
};
if (ioctl(vmfd, KVM_CHECK_EXTENSION, KVM_CAP_DEVICE_CTRL) <= 0) {
return false;
}
return (ioctl(vmfd, KVM_CREATE_DEVICE, &create_dev) >= 0);
}
int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source)
{
struct kvm_one_reg reg;