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Message-Id: <20120323080723.14568.23068.sendpatchset@codeblue>
Date: Fri, 23 Mar 2012 13:37:26 +0530
From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To: Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>
Cc: X86 <x86@...nel.org>, Avi Kivity <avi@...hat.com>,
Marcelo Tosatti <mtosatti@...hat.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Greg Kroah-Hartman <gregkh@...e.de>,
Alexander Graf <agraf@...e.de>,
Stefano Stabellini <stefano.stabellini@...citrix.com>,
Gleb Natapov <gleb@...hat.com>,
Randy Dunlap <rdunlap@...otime.net>, linux-doc@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>,
Virtualization <virtualization@...ts.linux-foundation.org>,
Xen <xen-devel@...ts.xensource.com>,
Sasha Levin <levinsasha928@...il.com>,
Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: [PATCH RFC V5 3/6] kvm : Add unhalt msr to aid (live) migration
From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Currently guest does not need to know pv_unhalt state and intended to be
used via GET/SET_MSR ioctls during migration.
Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
---
diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 9234f13..46f9751 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -40,6 +40,7 @@
#define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
#define MSR_KVM_ASYNC_PF_EN 0x4b564d02
#define MSR_KVM_STEAL_TIME 0x4b564d03
+#define MSR_KVM_PV_UNHALT 0x4b564d04
struct kvm_steal_time {
__u64 steal;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bd5ef91..38e6c47 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -784,12 +784,13 @@ EXPORT_SYMBOL_GPL(kvm_rdpmc);
* kvm-specific. Those are put in the beginning of the list.
*/
-#define KVM_SAVE_MSRS_BEGIN 9
+#define KVM_SAVE_MSRS_BEGIN 10
static u32 msrs_to_save[] = {
MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
+ MSR_KVM_PV_UNHALT,
MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
MSR_STAR,
#ifdef CONFIG_X86_64
@@ -1606,7 +1607,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
break;
-
+ case MSR_KVM_PV_UNHALT:
+ vcpu->pv_unhalted = (u32) data;
+ break;
case MSR_IA32_MCG_CTL:
case MSR_IA32_MCG_STATUS:
case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
@@ -1917,6 +1920,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
case MSR_KVM_STEAL_TIME:
data = vcpu->arch.st.msr_val;
break;
+ case MSR_KVM_PV_UNHALT:
+ data = (u64)vcpu->pv_unhalted;
+ break;
case MSR_IA32_P5_MC_ADDR:
case MSR_IA32_P5_MC_TYPE:
case MSR_IA32_MCG_CAP:
--
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