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| author |   Avi Kivity <avi@redhat.com> | 2012-04-18 15:03:04 +0300 |
|---|---|---|
| committer |   Marcelo Tosatti <mtosatti@redhat.com> | 2012-04-18 23:42:27 -0300 |
| commit | 2225fd56049643c1a7d645c0ce9d499d43c7974e (patch) | |
| tree | 968ee8ee689d619c663d49ad5f7cc150d38daab5 /virt/kvm/iommu.c | |
| parent | KVM: unmap pages from the iommu when slots are removed (diff) | |
| download | linux-dev-2225fd56049643c1a7d645c0ce9d499d43c7974e.tar.xz linux-dev-2225fd56049643c1a7d645c0ce9d499d43c7974e.zip | |
KVM: VMX: Fix kvm_set_shared_msr() called in preemptible context
kvm_set_shared_msr() may not be called in preemptible context,
but vmx_set_msr() does so:
BUG: using smp_processor_id() in preemptible [00000000] code: qemu-kvm/22713
caller is kvm_set_shared_msr+0x32/0xa0 [kvm]
Pid: 22713, comm: qemu-kvm Not tainted 3.4.0-rc3+ #39
Call Trace:
[<ffffffff8131fa82>] debug_smp_processor_id+0xe2/0x100
[<ffffffffa0328ae2>] kvm_set_shared_msr+0x32/0xa0 [kvm]
[<ffffffffa03a103b>] vmx_set_msr+0x28b/0x2d0 [kvm_intel]
...
Making kvm_set_shared_msr() work in preemptible is cleaner, but
it's used in the fast path. Making two variants is overkill, so
this patch just disables preemption around the call.
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt/kvm/iommu.c')
0 files changed, 0 insertions, 0 deletions