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Date: Tue, 10 Aug 2021 17:24:52 +0200 From: Thomas Gleixner <tglx@...utronix.de> To: Hikaru Nishida <hikalium@...omium.org>, linux-kernel@...r.kernel.org, dme@....org, mlevitsk@...hat.com 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>, Vitaly Kuznetsov <vkuznets@...hat.com>, Wanpeng Li <wanpengli@...cent.com>, kvm@...r.kernel.org, x86@...nel.org Subject: Re: [v2 PATCH 3/4] x86/kvm: Add host side support for virtual suspend time injection On Fri, Aug 06 2021 at 19:07, Hikaru Nishida wrote: > > +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING > +void kvm_arch_timekeeping_inject_sleeptime(const struct timespec64 *delta) > +{ > + struct kvm_vcpu *vcpu; > + u64 suspend_time_ns; > + struct kvm *kvm; > + s64 adj; > + int i; > + > + suspend_time_ns = timespec64_to_ns(delta); > + adj = tsc_khz * (suspend_time_ns / 1000000); > + /* > + * Adjust TSCs on all vcpus and kvmclock as if they are stopped > + * during host's suspension. > + * Also, cummulative suspend time is recorded in kvm structure and > + * the update will be notified via an interrupt for each vcpu. > + */ > + mutex_lock(&kvm_lock); This is invoked from with timekeeper_lock held with interrupts disabled. How is a mutex_lock() supposed to work here? Thanks, tglx
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