linux-kernel - [RFC PATCH 2/6] x86/kvm: Add a struct and constants for virtual suspend time injection

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Date:   Mon, 26 Apr 2021 18:06:41 +0900
From:   Hikaru Nishida <hikalium@...omium.org>
To:     kvm@...r.kernel.org
Cc:     suleiman@...gle.com, Hikaru Nishida <hikalium@...omium.org>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        John Stultz <john.stultz@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [RFC PATCH 2/6] x86/kvm: Add a struct and constants for virtual suspend time injection

This patch adds definitions that are needed by both host and guest
to implement virtual suspend time injection.
This patch also adds #include <linux/kvm_host.h> in
kernel/time/timekeeping.c to make necesarily functions which will be
introduced in later patches available.

Signed-off-by: Hikaru Nishida <hikalium@...omium.org>
---

 arch/x86/include/uapi/asm/kvm_para.h | 6 ++++++
 kernel/time/timekeeping.c            | 1 +
 2 files changed, 7 insertions(+)

diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h
index 950afebfba88..13788b01094f 100644
--- a/arch/x86/include/uapi/asm/kvm_para.h
+++ b/arch/x86/include/uapi/asm/kvm_para.h
@@ -33,6 +33,7 @@
 #define KVM_FEATURE_PV_SCHED_YIELD	13
 #define KVM_FEATURE_ASYNC_PF_INT	14
 #define KVM_FEATURE_MSI_EXT_DEST_ID	15
+#define KVM_FEATURE_HOST_SUSPEND_TIME	16
 
 #define KVM_HINTS_REALTIME      0
 
@@ -54,6 +55,7 @@
 #define MSR_KVM_POLL_CONTROL	0x4b564d05
 #define MSR_KVM_ASYNC_PF_INT	0x4b564d06
 #define MSR_KVM_ASYNC_PF_ACK	0x4b564d07
+#define MSR_KVM_HOST_SUSPEND_TIME      0x4b564d08
 
 struct kvm_steal_time {
 	__u64 steal;
@@ -64,6 +66,10 @@ struct kvm_steal_time {
 	__u32 pad[11];
 };
 
+struct kvm_host_suspend_time {
+	__u64   suspend_time_ns;
+};
+
 #define KVM_VCPU_PREEMPTED          (1 << 0)
 #define KVM_VCPU_FLUSH_TLB          (1 << 1)
 
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 6aee5768c86f..ff0304de7de9 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -22,6 +22,7 @@
 #include <linux/pvclock_gtod.h>
 #include <linux/compiler.h>
 #include <linux/audit.h>
+#include <linux/kvm_host.h>
 
 #include "tick-internal.h"
 #include "ntp_internal.h"
-- 
2.31.1.498.g6c1eba8ee3d-goog