linux-kernel - [PATCH 18/35] KVM: add basic paravirt support

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Date:	Thu,  3 Apr 2008 22:32:33 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com>
Subject: [PATCH 18/35] KVM: add basic paravirt support

From: Marcelo Tosatti <mtosatti@...hat.com>

Add basic KVM paravirt support. Avoid vm-exits on IO delays.

Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 arch/x86/kvm/x86.c         |    1 +
 include/asm-x86/kvm_para.h |    3 ++-
 include/linux/kvm.h        |    1 +
 3 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 621a8e3..1b9e695 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -820,6 +820,7 @@ int kvm_dev_ioctl_check_extension(long ext)
 	case KVM_CAP_EXT_CPUID:
 	case KVM_CAP_CLOCKSOURCE:
 	case KVM_CAP_PIT:
+	case KVM_CAP_NOP_IO_DELAY:
 		r = 1;
 		break;
 	case KVM_CAP_VAPIC:
diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h
index 5ab7d3d..ed5df3a 100644
--- a/include/asm-x86/kvm_para.h
+++ b/include/asm-x86/kvm_para.h
@@ -10,7 +10,8 @@
  * paravirtualization, the appropriate feature bit should be checked.
  */
 #define KVM_CPUID_FEATURES	0x40000001
-#define KVM_FEATURE_CLOCKSOURCE 0
+#define KVM_FEATURE_CLOCKSOURCE		0
+#define KVM_FEATURE_NOP_IO_DELAY	1
 
 #define MSR_KVM_WALL_CLOCK  0x11
 #define MSR_KVM_SYSTEM_TIME 0x12
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index a2f3274..76f0947 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -237,6 +237,7 @@ struct kvm_vapic_addr {
 #define KVM_CAP_NR_VCPUS 9       /* returns max vcpus per vm */
 #define KVM_CAP_NR_MEMSLOTS 10   /* returns max memory slots per vm */
 #define KVM_CAP_PIT 11
+#define KVM_CAP_NOP_IO_DELAY 12
 
 /*
  * ioctls for VM fds
-- 
1.5.4.5

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