[PATCH V3 04/14] KVM: MIPS: Add EVENTFD support which is needed by VHOST

[Huacai Chen]

Add EVENTFD support for KVM/MIPS, which is needed by VHOST. Tested on
Loongson-3 platform.

Signed-off-by: Huacai Chen <address@hidden>
Co-developed-by: Jiaxun Yang <address@hidden>
---
 arch/mips/kvm/Kconfig     | 1 +
 arch/mips/kvm/Makefile    | 2 +-
 arch/mips/kvm/trap_emul.c | 3 +++
 arch/mips/kvm/vz.c        | 3 +++
 4 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig
index b91d145..d697752 100644
--- a/arch/mips/kvm/Kconfig
+++ b/arch/mips/kvm/Kconfig
@@ -22,6 +22,7 @@ config KVM
        select EXPORT_UASM
        select PREEMPT_NOTIFIERS
        select KVM_GENERIC_DIRTYLOG_READ_PROTECT
+       select HAVE_KVM_EVENTFD
        select HAVE_KVM_VCPU_ASYNC_IOCTL
        select KVM_MMIO
        select MMU_NOTIFIER
diff --git a/arch/mips/kvm/Makefile b/arch/mips/kvm/Makefile
index 01affc1..0a3cef6 100644
--- a/arch/mips/kvm/Makefile
+++ b/arch/mips/kvm/Makefile
@@ -2,7 +2,7 @@
 # Makefile for KVM support for MIPS
 #
 
-common-objs-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o)
+common-objs-y = $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o 
eventfd.o)
 
 EXTRA_CFLAGS += -Ivirt/kvm -Iarch/mips/kvm
 
diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
index 5a11e83..f464506b 100644
--- a/arch/mips/kvm/trap_emul.c
+++ b/arch/mips/kvm/trap_emul.c
@@ -529,6 +529,9 @@ static int kvm_trap_emul_check_extension(struct kvm *kvm, 
long ext)
        case KVM_CAP_MIPS_TE:
                r = 1;
                break;
+       case KVM_CAP_IOEVENTFD:
+               r = 1;
+               break;
        default:
                r = 0;
                break;
diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
index dde2088..17932ab 100644
--- a/arch/mips/kvm/vz.c
+++ b/arch/mips/kvm/vz.c
@@ -2927,6 +2927,9 @@ static int kvm_vz_check_extension(struct kvm *kvm, long 
ext)
                r = 2;
                break;
 #endif
+       case KVM_CAP_IOEVENTFD:
+               r = 1;
+               break;
        default:
                r = 0;
                break;
-- 
2.7.0