mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Disable KVM support if the kernel modules have broken memory slot handling

Browse Source 
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
This commit is contained in:
aliguori 2008-12-09 19:59:09 +00:00
parent f19412a2a6
commit d85dc283fa
2 changed files with 17 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
configure vendored
View File

@ -933,7 +933,8 @@ if test "$kvm" = "yes" ; then
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; }

15
kvm-all.c
View File

@ -283,6 +283,21 @@ int kvm_init(int smp_cpus)
goto err;
}
/* 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;