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KVM: selftests: simplify setup_demand_paging error handling

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A small cleanup. Our caller writes:

  r = setup_demand_paging(...);
  if (r < 0) exit(-r);

Since we're just going to exit anyway, instead of returning an error we
can just re-use TEST_ASSERT. This makes the caller simpler, as well as
the function itself - no need to write our branches, etc.

Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Message-Id: <20210519200339.829146-3-axelrasmussen@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Axel Rasmussen 2021-05-19 13:03:31 -07:00 committed by Paolo Bonzini
parent 2aab4b355c
commit 25408e5a02
1 changed files with 18 additions and 32 deletions
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50
tools/testing/selftests/kvm/demand_paging_test.c
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@ -9,6 +9,7 @@
#define _GNU_SOURCE /* for pipe2 */
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
@ -198,42 +199,32 @@ static void *uffd_handler_thread_fn(void *arg)
return NULL;
}
static int setup_demand_paging(struct kvm_vm *vm,
pthread_t *uffd_handler_thread, int pipefd,
useconds_t uffd_delay,
struct uffd_handler_args *uffd_args,
void *hva, uint64_t len)
static void setup_demand_paging(struct kvm_vm *vm,
pthread_t *uffd_handler_thread, int pipefd,
useconds_t uffd_delay,
struct uffd_handler_args *uffd_args,
void *hva, uint64_t len)
{
int uffd;
struct uffdio_api uffdio_api;
struct uffdio_register uffdio_register;
uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
if (uffd == -1) {
pr_info("uffd creation failed\n");
return -1;
}
TEST_ASSERT(uffd >= 0, "uffd creation failed, errno: %d", errno);
uffdio_api.api = UFFD_API;
uffdio_api.features = 0;
if (ioctl(uffd, UFFDIO_API, &uffdio_api) == -1) {
pr_info("ioctl uffdio_api failed\n");
return -1;
}
TEST_ASSERT(ioctl(uffd, UFFDIO_API, &uffdio_api) != -1,
"ioctl UFFDIO_API failed: %" PRIu64,
(uint64_t)uffdio_api.api);
uffdio_register.range.start = (uint64_t)hva;
uffdio_register.range.len = len;
uffdio_register.mode = UFFDIO_REGISTER_MODE_MISSING;
if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register) == -1) {
pr_info("ioctl uffdio_register failed\n");
return -1;
}
if ((uffdio_register.ioctls & UFFD_API_RANGE_IOCTLS) !=
UFFD_API_RANGE_IOCTLS) {
pr_info("unexpected userfaultfd ioctl set\n");
return -1;
}
TEST_ASSERT(ioctl(uffd, UFFDIO_REGISTER, &uffdio_register) != -1,
"ioctl UFFDIO_REGISTER failed");
TEST_ASSERT((uffdio_register.ioctls & UFFD_API_RANGE_IOCTLS) ==
UFFD_API_RANGE_IOCTLS, "unexpected userfaultfd ioctl set");
uffd_args->uffd = uffd;
uffd_args->pipefd = pipefd;
@ -243,8 +234,6 @@ static int setup_demand_paging(struct kvm_vm *vm,
PER_VCPU_DEBUG("Created uffd thread for HVA range [%p, %p)\n",
hva, hva + len);
return 0;
}
struct test_params {
@ -321,13 +310,10 @@ static void run_test(enum vm_guest_mode mode, void *arg)
O_CLOEXEC | O_NONBLOCK);
TEST_ASSERT(!r, "Failed to set up pipefd");
r = setup_demand_paging(vm,
&uffd_handler_threads[vcpu_id],
pipefds[vcpu_id * 2],
p->uffd_delay, &uffd_args[vcpu_id],
vcpu_hva, vcpu_mem_size);
if (r < 0)
exit(-r);
setup_demand_paging(vm, &uffd_handler_threads[vcpu_id],
pipefds[vcpu_id * 2], p->uffd_delay,
&uffd_args[vcpu_id], vcpu_hva,
vcpu_mem_size);
}
}