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authorMarkus Armbruster <armbru@redhat.com>2013-07-04 15:09:20 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2013-07-09 13:38:58 -0500
commit36ad0e948e15d8d86c8dec1c17a8588d87b0107d (patch)
tree6e317533a5b27c566109539dc503dafd9367d6cc /kvm-all.c
parent7f9d6e540ec4f3bf4dc3501c4a1405998c2be4e7 (diff)
Fix -machine options accel, kernel_irqchip, kvm_shadow_mem
Multiple -machine options with the same ID are merged. All but the one without an ID are to be silently ignored. In most places, we query these options with a null ID. This is correct. In some places, we instead query whatever options come first in the list. This is wrong. When the -machine processed first happens to have an ID, options are taken from that ID, and the ones specified without ID are silently ignored. Example: $ upstream-qemu -nodefaults -S -display none -monitor stdio -machine id=foo -machine accel=kvm,usb=on $ upstream-qemu -nodefaults -S -display none -monitor stdio -machine id=foo,accel=kvm,usb=on -machine accel=xen $ upstream-qemu -nodefaults -S -display none -monitor stdio -machine accel=xen -machine id=foo,accel=kvm,usb=on $ qemu-system-x86_64 -nodefaults -S -display none -monitor stdio -machine accel=kvm,usb=on QEMU 1.5.50 monitor - type 'help' for more information (qemu) info kvm kvm support: enabled (qemu) info usb (qemu) q $ qemu-system-x86_64 -nodefaults -S -display none -monitor stdio -machine id=foo -machine accel=kvm,usb=on QEMU 1.5.50 monitor - type 'help' for more information (qemu) info kvm kvm support: disabled (qemu) info usb (qemu) q $ qemu-system-x86_64 -nodefaults -S -display none -monitor stdio -machine id=foo,accel=kvm,usb=on -machine accel=xen QEMU 1.5.50 monitor - type 'help' for more information (qemu) info kvm kvm support: enabled (qemu) info usb USB support not enabled (qemu) q $ qemu-system-x86_64 -nodefaults -S -display none -monitor stdio -machine accel=xen -machine id=foo,accel=kvm,usb=on xc: error: Could not obtain handle on privileged command interface (2 = No such file or directory): Internal error xen be core: can't open xen interface failed to initialize Xen: Operation not permitted Option usb is queried correctly, and the one without an ID wins, regardless of option order. Option accel is queried incorrectly, and which one wins depends on option order and ID. Affected options are accel (and its sugared forms -enable-kvm and -no-kvm), kernel_irqchip, kvm_shadow_mem. Additionally, option kernel_irqchip is normally on by default, except it's off when no -machine options are given. Bug can't bite, because kernel_irqchip is used only when KVM is enabled, KVM is off by default, and enabling always creates -machine options. Downstreams that enable KVM by default do get bitten, though. Use qemu_get_machine_opts() to fix these bugs. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-id: 1372943363-24081-5-git-send-email-armbru@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'kvm-all.c')
-rw-r--r--kvm-all.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/kvm-all.c b/kvm-all.c
index de658de98f..a5cd3d3340 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1288,12 +1288,9 @@ int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, int virq)
static int kvm_irqchip_create(KVMState *s)
{
- QemuOptsList *list = qemu_find_opts("machine");
int ret;
- if (QTAILQ_EMPTY(&list->head) ||
- !qemu_opt_get_bool(QTAILQ_FIRST(&list->head),
- "kernel_irqchip", true) ||
+ if (!qemu_opt_get_bool(qemu_get_machine_opts(), "kernel_irqchip", true) ||
!kvm_check_extension(s, KVM_CAP_IRQCHIP)) {
return 0;
}