Prior to kvm-80, memory slot deletion was broken in the KVM kernel
modules. In kvm-81, a new capability is introduced to signify that this
problem has been fixed.
Since we rely on being able to delete memory slots, refuse to work with
any kernel module that does not have this capability present.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5960
c046a42c-6fe2-441c-8c8c-
71466251a162
KVM_API_VERSION < 12 || \
KVM_API_VERSION > 12 || \
!defined(KVM_CAP_USER_MEMORY) || \
KVM_API_VERSION < 12 || \
KVM_API_VERSION > 12 || \
!defined(KVM_CAP_USER_MEMORY) || \
- !defined(KVM_CAP_SET_TSS_ADDR)
+ !defined(KVM_CAP_SET_TSS_ADDR) || \
+ !defined(KVM_CAP_DESTROY_MEMORY_REGION_WORKS)
#error Invalid KVM version
#endif
int main(void) { return 0; }
#error Invalid KVM version
#endif
int main(void) { return 0; }
+ /* There was a nasty bug in < kvm-80 that prevents memory slots from being
+ * destroyed properly. Since we rely on this capability, refuse to work
+ * with any kernel without this capability. */
+ ret = kvm_ioctl(s, KVM_CHECK_EXTENSION,
+ KVM_CAP_DESTROY_MEMORY_REGION_WORKS);
+ if (ret <= 0) {
+ if (ret == 0)
+ ret = -EINVAL;
+
+ fprintf(stderr,
+ "KVM kernel module broken (DESTROY_MEMORY_REGION)\n"
+ "Please upgrade to at least kvm-81.\n");
+ goto err;
+ }
+
ret = kvm_arch_init(s, smp_cpus);
if (ret < 0)
goto err;
ret = kvm_arch_init(s, smp_cpus);
if (ret < 0)
goto err;