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kvm: Flush coalesced mmio buffer on IO window exits 

We must flush pending mmio writes if we leave kvm_cpu_exec for an IO
window. Otherwise we risk to loose those requests when migrating to a
different host during that window.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2011-01-21 21:48:19 +01:00 committed by Marcelo Tosatti
parent 110761987d
commit b0c883b5e0
1 changed files with 2 additions and 2 deletions
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4
kvm-all.c
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@ -918,6 +918,8 @@ int kvm_cpu_exec(CPUState *env)
cpu_single_env = env; cpu_single_env = env;
kvm_arch_post_run(env, run); kvm_arch_post_run(env, run);
kvm_flush_coalesced_mmio_buffer();
if (ret == -EINTR || ret == -EAGAIN) { if (ret == -EINTR || ret == -EAGAIN) {
cpu_exit(env); cpu_exit(env);
DPRINTF("io window exit\n"); DPRINTF("io window exit\n");
@ -930,8 +932,6 @@ int kvm_cpu_exec(CPUState *env)
abort(); abort();
} }
kvm_flush_coalesced_mmio_buffer();
ret = 0; /* exit loop */ ret = 0; /* exit loop */
switch (run->exit_reason) { switch (run->exit_reason) {
case KVM_EXIT_IO: case KVM_EXIT_IO: