linux-kernel - [PATCH 1/3] include files for kvmclock

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Date:	Thu,  8 Nov 2007 20:39:21 -0200
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	jeremy@...p.org, avi@...ranet.com, aliguori@...ibm.com,
	kvm-devel@...ts.sourceforge.net, hollisb@...ibm.com,
	Glauber de Oliveira Costa <gcosta@...hat.com>
Subject: [PATCH 1/3] include files for kvmclock

This patch introduces the include files for kvm clock.
They'll be needed for both guest and host part.

Signed-off-by: Glauber de Oliveira Costa <gcosta@...hat.com>
---
 include/asm-x86/kvm_para.h |   25 +++++++++++++++++++++++++
 include/linux/kvm.h        |    1 +
 include/linux/kvm_para.h   |    2 ++
 3 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h
index c6f3fd8..0f6b813 100644
--- a/include/asm-x86/kvm_para.h
+++ b/include/asm-x86/kvm_para.h
@@ -10,15 +10,40 @@
  * paravirtualization, the appropriate feature bit should be checked.
  */
 #define KVM_CPUID_FEATURES	0x40000001
+#define KVM_FEATURE_CLOCKSOURCE 0
 
 #ifdef __KERNEL__
 #include <asm/processor.h>
+extern void kvmclock_init(void);
+
+/*
+ * Guest has page alignment and padding requirements. At the host, it will
+ * only lead to wasted space at the vcpu struct. For this reason, the struct
+ * is not anonymous
+ */
+union kvm_hv_clock {
+	struct kvm_hv_clock_s {
+		u64 tsc_mult;
+		u64 now_ns;
+		/* That's the wall clock, not the water closet */
+		u64 wc_sec;
+		u64 last_tsc;
+		/* At first, we could use the tsc value as a marker, but Jeremy
+		 * well noted that it will cause us locking problems in 32-bit
+		 * sys, so we have a special version field */
+		u32 version;
+	} fields;
+	char page_align[PAGE_SIZE];
+};
+
 
 /* This instruction is vmcall.  On non-VT architectures, it will generate a
  * trap that we will then rewrite to the appropriate instruction.
  */
 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
 
+#define KVM_HCALL_REGISTER_CLOCK	1
+
 /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
  * instruction.  The hypervisor may replace it with something else but only the
  * instructions are guaranteed to be supported.
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 71d33d6..9862241 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -359,6 +359,7 @@ struct kvm_signal_mask {
 #define KVM_CAP_MMU_SHADOW_CACHE_CONTROL 2
 #define KVM_CAP_USER_MEMORY 3
 #define KVM_CAP_SET_TSS_ADDR 4
+#define KVM_CAP_CLOCKSOURCE	  5
 
 /*
  * ioctls for VM fds
diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h
index e4db25f..094efc7 100644
--- a/include/linux/kvm_para.h
+++ b/include/linux/kvm_para.h
@@ -11,6 +11,8 @@
 
 /* Return values for hypercalls */
 #define KVM_ENOSYS		1000
+#define KVM_EINVAL		1019
+#define KVM_ENODEV		1022
 
 #ifdef __KERNEL__
 /*
-- 
1.5.0.6

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