Re: [RESEND 2][PATCH 4/4] Modify KVM to update guest time accounting.

Ingo Molnar
2007-10-15T09:38:25Z

* Laurent Vivier <Laurent.Vivier@bull.net> wrote:

> [PATCH 4/4] Modify KVM to update guest time accounting.

FYI, KVM abstracted its guest-mode entry code recently so this did not
apply - find below the reworked patch.

Ingo

------------------->
Subject: sched: guest CPU accounting: maintain guest state in KVM
From: Laurent Vivier <Laurent.Vivier@bull.net>

Modify KVM to update guest time accounting.

[ mingo@elte.hu: ported to 2.6.24 KVM. ]

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Acked-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
drivers/kvm/kvm.h | 16 ++++++++++++++++
drivers/kvm/kvm_main.c | 2 ++
2 files changed, 18 insertions(+)

Index: linux/drivers/kvm/kvm.h
===================================================================
--- linux.orig/drivers/kvm/kvm.h
+++ linux/drivers/kvm/kvm.h
@@ -624,6 +624,22 @@ void kvm_mmu_unload(struct kvm_vcpu *vcp

int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);

+/*
+ * Compatibility define - PF_VCPU is only available in v2.6.24+ kernels:
+ */
+#ifndef PF_VCPU
+# define PF_VCPU 0
+#endif
+
+static inline void kvm_guest_enter(void)
+{
+ current->flags |= PF_VCPU;
+}
+
+static inline void kvm_guest_exit(void)
+{
+}
+
static inline int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
u32 error_code)
{
Index: linux/drivers/kvm/kvm_main.c
===================================================================
--- linux.orig/drivers/kvm/kvm_main.c
+++ linux/drivers/kvm/kvm_main.c
@@ -2046,6 +2046,7 @@ again:
kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);

vcpu->guest_mode = 1;
+ kvm_guest_enter();

if (vcpu->requests)
if (test_and_clear_bit(KVM_TLB_FLUSH, &vcpu->requests))
@@ -2053,6 +2054,7 @@ again:

kvm_x86_ops->run(vcpu, kvm_run);

+ kvm_guest_exit();
vcpu->guest_mode = 0;
local_irq_enable();