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[34.168.104.7]) by smtp.gmail.com with ESMTPSA id j3-20020a17090a318300b002296094b9cdsm3340526pjb.24.2023.01.19.09.57.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Jan 2023 09:57:49 -0800 (PST) Date: Thu, 19 Jan 2023 17:57:45 +0000 From: Sean Christopherson To: Yu Zhang Cc: Paolo Bonzini , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Michal Luczaj , David Woodhouse Subject: Re: [PATCH] KVM: x86: fix deadlock for KVM_XEN_EVTCHN_RESET Message-ID: References: <20221228110410.1682852-1-pbonzini@redhat.com> <20230119155800.fiypvvzoalnfavse@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230119155800.fiypvvzoalnfavse@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 19, 2023, Yu Zhang wrote: > Hi Paolo, > > > diff --git a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c > > index 721f6a693799..dae510c263b4 100644 > > --- a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c > > +++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c > > @@ -962,6 +962,12 @@ int main(int argc, char *argv[]) > > } > > > > done: > > + struct kvm_xen_hvm_attr evt_reset = { > > + .type = KVM_XEN_ATTR_TYPE_EVTCHN, > > + .u.evtchn.flags = KVM_XEN_EVTCHN_RESET, > > + }; > > + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &evt_reset); > > + > > alarm(0); > > clock_gettime(CLOCK_REALTIME, &max_ts); > > > > This change generates a build failure with error message: > "error: a label can only be part of a statement and a declaration is not a statement". And other flavors too, e.g. x86_64/xen_shinfo_test.c:965:2: error: expected expression struct kvm_xen_hvm_attr evt_reset = { ^ x86_64/xen_shinfo_test.c:969:38: error: use of undeclared identifier 'evt_reset' vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &evt_reset); ^ x86_64/xen_shinfo_test.c:969:38: error: use of undeclared identifier 'evt_reset' 3 errors generated. make: *** [../lib.mk:145: tools/testing/selftests/kvm/x86_64/xen_shinfo_test] Error 1 make: *** Waiting for unfinished jobs.... I'm surprised bots haven't complained about this, haven't seen any reports. > Moving the definition of evt_reset to the beginning of main() can fix it: I'll queue a patch, this is already in Linus' tree and I've collected a few other tiny fixes for v6.2-rcwhatever that I'll send to Paolo. Thanks!