diff mbox series

[RFC,3/6] x86/kvm: Add CONFIG_KVM_VIRT_SUSPEND_TIMING

Message ID 20210426090644.2218834-4-hikalium@chromium.org (mailing list archive)
State New, archived
Headers show
Series x86/kvm: Virtual suspend time injection support | expand

Commit Message

Hikaru Nishida April 26, 2021, 9:06 a.m. UTC 
The config option can be used to enable virtual suspend time injection
support on kvm hosts.

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

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

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