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kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks

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kvm_hc_kick_cpu allows the calling vcpu to kick another vcpu out of halt state.
the presence of these hypercalls is indicated to guest via
kvm_feature_pv_unhalt.

Fold pv_unhalt flag into GET_MP_STATE ioctl to aid migration
During migration, any vcpu that got kicked but did not become runnable
(still in halted state) should be runnable after migration.

Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Suzuki Poulose <suzuki@in.ibm.com>
[Raghu: Apic related changes, folding pvunhalted into vcpu_runnable
 Added flags for future use (suggested by Gleb)]
[ Raghu: fold pv_unhalt flag as suggested by Eric Northup]
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Srivatsa Vaddagiri
2013-08-26 14:18:34 +05:30
committed by Gleb Natapov
parent 4b0a867085
commit 6aef266c6e
3 changed files with 50 additions and 2 deletions
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5
arch/x86/include/asm/kvm_host.h
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@@ -516,6 +516,11 @@ struct kvm_vcpu_arch {
/* set at EPT violation at this point */
unsigned long exit_qualification;
/* pv related host specific info */
struct {
bool pv_unhalted;
} pv;
};
struct kvm_lpage_info {