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From: Srivatsa Vaddagiri on 26 Jul 2010 02:20
Add yield hypercall support in Qemu.

Signed-off-by: Srivatsa Vaddagiri <vatsa(a)linux.vnet.ibm.com>

---
kvm/include/linux/kvm.h | 1 +
kvm/include/x86/asm/kvm_para.h | 1 +
target-i386/kvm.c | 3 +++
3 files changed, 5 insertions(+)

Index: qemu-kvm/kvm/include/linux/kvm.h
===================================================================
--- qemu-kvm.orig/kvm/include/linux/kvm.h
+++ qemu-kvm/kvm/include/linux/kvm.h
@@ -499,6 +499,7 @@ struct kvm_ioeventfd {
#define KVM_CAP_PPC_SEGSTATE 43

#define KVM_CAP_PCI_SEGMENT 47
+#define KVM_CAP_YIELD_HYPERCALL 55

#ifdef KVM_CAP_IRQ_ROUTING

Index: qemu-kvm/kvm/include/x86/asm/kvm_para.h
===================================================================
--- qemu-kvm.orig/kvm/include/x86/asm/kvm_para.h
+++ qemu-kvm/kvm/include/x86/asm/kvm_para.h
@@ -15,6 +15,7 @@
#define KVM_FEATURE_CLOCKSOURCE 0
#define KVM_FEATURE_NOP_IO_DELAY 1
#define KVM_FEATURE_MMU_OP 2
+#define KVM_FEATURE_YIELD 4

#define MSR_KVM_WALL_CLOCK 0x11
#define MSR_KVM_SYSTEM_TIME 0x12
Index: qemu-kvm/target-i386/kvm.c
===================================================================
--- qemu-kvm.orig/target-i386/kvm.c
+++ qemu-kvm/target-i386/kvm.c
@@ -147,6 +147,9 @@ struct kvm_para_features {
#ifdef KVM_CAP_PV_MMU
{ KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
#endif
+#ifdef KVM_CAP_YIELD_HYPERCALL
+ { KVM_CAP_YIELD_HYPERCALL, KVM_FEATURE_YIELD },
+#endif
{ -1, -1 }
};

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Prev: [PATCH RFC 2/4] Add yield hypercall for KVM guests
Next: blkiocg async: Make page_cgroup independent from memory controller