kvm: x86: Add support for x86 INIT and STARTUP handling

This changeset adds support for INIT and STARTUP IPI handling. We
currently handle both of these interrupts in gem5 and transfer the
state to KVM. Since we do not have a BIOS loaded, we pretend that the
INIT interrupt suspends the CPU after reset.

--HG--
extra : rebase_source : 7f3b25f3801d68f668b6cd91eaf50d6f48ee2a6a

1 files changed, 6 insertions, 0 deletions

diff --git a/src/cpu/kvm/base.cc b/src/cpu/kvm/base.cc
index 26ffe37a5..1149a3704 100644
--- a/src/cpu/kvm/base.cc
+++ b/src/cpu/kvm/base.cc
@@ -543,6 +543,12 @@ BaseKvmCPU::tick()
               delay = kvmRun(ticksToExecute);
           }
 
+          // The CPU might have been suspended before entering into
+          // KVM. Assume that the CPU was suspended /before/ entering
+          // into KVM and skip the exit handling.
+          if (_status == Idle)
+              break;
+
           // Entering into KVM implies that we'll have to reload the thread
           // context from KVM if we want to access it. Flag the KVM state as
           // dirty with respect to the cached thread context.