KVM: x86: WARN_ONCE if sending a PV IPI returns a fatal error

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commit de81c2f912 upstream.

KVM hypercalls return a negative value error code in case of a fatal
error, e.g. when the hypercall isn't supported or was made with invalid
parameters.  WARN_ONCE on fatal errors when sending PV IPIs as any such
error all but guarantees an SMP system will hang due to a missing IPI.

Fixes: aaffcfd1e8 ("KVM: X86: Implement PV IPIs in linux guest")
Cc: stable@vger.kernel.org
Cc: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Sean Christopherson 2019-01-23 09:22:40 -08:00 • committed by Greg Kroah-Hartman

parent 39493bce6a

commit 56b6631bd6

1 changed files with 5 additions and 2 deletions

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arch/x86/kernel/kvm.c

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