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Date: Tue, 2 Jan 2018 00:01:03 +0100 From: Paolo Bonzini <pbonzini@...hat.com> To: Wanpeng Li <kernellwp@...il.com> Cc: linux-kernel@...r.kernel.org, kvm <kvm@...r.kernel.org> Subject: Re: [PATCH 0/4] KVM: nVMX: prepare_vmcs02 optimizations On 01/01/2018 10:36, Paolo Bonzini wrote: > On 28/12/2017 09:39, Wanpeng Li wrote: >> 2017-12-27 22:28 GMT+08:00 Paolo Bonzini <pbonzini@...hat.com>: >>> On 25/12/2017 11:08, Wanpeng Li wrote: >>>>> I observe L1(latest kvm/queue) panic and L0(latest kvm/queue) >>>>> calltrace, I'm not sure whether it is caused by this patchset. >>>> It can be reproduced steadily by running kvm-unit-tests in L1. >>> >>> It works here, can you show the L0 call trace and/or bisect it? >> >> L0 call trace has already been posted here. >> https://lkml.org/lkml/2017/12/25/53 In addition, the splatting is >> still there after I revert the last 9 nVMX optimization patches in >> kvm/queue. So it is not caused by this patchset. :) > > Hmm, maybe you're using "-cpu host,+umip"? I'll check when I get back > to work tomorrow. Yeah, I think this could be it: diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 30e6115d4f09..6404e96179b4 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -10780,6 +10780,7 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | SECONDARY_EXEC_ENABLE_INVPCID | SECONDARY_EXEC_RDTSCP | + SECONDARY_EXEC_DESC | SECONDARY_EXEC_XSAVES | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | SECONDARY_EXEC_APIC_REGISTER_VIRT | Paolo
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