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From: Hikaru Nishida <hikalium@chromium.org>
To: kvm@vger.kernel.org
Cc: suleiman@google.com, Hikaru Nishida <hikalium@chromium.org>,
	Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, x86@kernel.org
Subject: [RFC PATCH 5/6] x86/kvm: Add CONFIG_KVM_VIRT_SUSPEND_TIMING_GUEST
Date: Mon, 26 Apr 2021 18:06:44 +0900	[thread overview]
Message-ID: <20210426090644.2218834-6-hikalium@chromium.org> (raw)
In-Reply-To: <20210426090644.2218834-1-hikalium@chromium.org>

The config option can be used to enable virtual suspend time injection
support on kvm guests.

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

 arch/x86/Kconfig | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2792879d398e..fac06534c30a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -825,6 +825,19 @@ config KVM_GUEST
 	  underlying device model, the host provides the guest with
 	  timing infrastructure such as time of day, and system time
 
+config KVM_VIRT_SUSPEND_TIMING_GUEST
+	bool "Virtual suspend time injection (guest side)"
+	depends on KVM_GUEST
+	default n
+	help
+	 This option makes the host's suspension reflected on the guest's clocks.
+	 In other words, guest's CLOCK_MONOTONIC will stop and
+	 CLOCK_BOOTTIME keeps running during the host's suspension.
+	 This feature will only be effective when both guest and host enable
+	 this option.
+
+	 If unsure, say N.
+
 config ARCH_CPUIDLE_HALTPOLL
 	def_bool n
 	prompt "Disable host haltpoll when loading haltpoll driver"
-- 
2.31.1.498.g6c1eba8ee3d-goog


  parent reply	other threads:[~2021-04-26  9:09 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-26  9:06 [RFC PATCH 0/6] x86/kvm: Virtual suspend time injection support Hikaru Nishida
2021-04-26  9:06 ` [RFC PATCH 1/6] x86/kvm: Reserve KVM_FEATURE_HOST_SUSPEND_TIME and MSR_KVM_HOST_SUSPEND_TIME Hikaru Nishida
2021-04-27 15:12   ` David Edmondson
2021-04-26  9:06 ` [RFC PATCH 2/6] x86/kvm: Add a struct and constants for virtual suspend time injection Hikaru Nishida
2021-04-27 15:14   ` David Edmondson
2021-04-26  9:06 ` [RFC PATCH 3/6] x86/kvm: Add CONFIG_KVM_VIRT_SUSPEND_TIMING Hikaru Nishida
2021-04-26  9:06 ` [RFC PATCH 4/6] x86/kvm: Add a host side support for virtual suspend time injection Hikaru Nishida
2021-04-27 15:20   ` David Edmondson
2021-04-26  9:06 ` Hikaru Nishida [this message]
2021-04-26  9:06 ` [RFC PATCH 6/6] x86/kvm: Add a guest " Hikaru Nishida
2021-04-26 14:21   ` Thomas Gleixner
2021-04-26 13:15 ` [RFC PATCH 0/6] x86/kvm: Virtual suspend time injection support Maxim Levitsky

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