linux-kernel - [RFC PATCH 3/6] x86/kvm: Add CONFIG_KVM_VIRT_SUSPEND

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Date:   Mon, 26 Apr 2021 18:06:42 +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>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        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 3/6] x86/kvm: Add CONFIG_KVM_VIRT_SUSPEND_TIMING

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

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

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

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index a788d5120d4d..6cb6795726a2 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -119,4 +119,17 @@ config KVM_MMU_AUDIT
 	 This option adds a R/W kVM module parameter 'mmu_audit', which allows
 	 auditing of KVM MMU events at runtime.
 
+config KVM_VIRT_SUSPEND_TIMING
+	bool "Virtual suspend time injection"
+	depends on KVM=y
+	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.
+
 endif # VIRTUALIZATION
-- 
2.31.1.498.g6c1eba8ee3d-goog