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AJvYcCVqrJGvwqdeHjrSXceMOVk5hZm0D6C8KyPqXOLNYc1Q/E4WeWGQlUwcZjU9mRcGngpep9u7sBwSHJ9ZTJ4=@vger.kernel.org X-Gm-Message-State: AOJu0YwSjrD9oSwDdK2RCKnGNXlTYgXVqozENMZ5Qu1CBL/5F/bG4Ni7 yoVg5f1J9uPpHyD9selFJDPBLTAydwfirGzkRho69DQLUj0Xk8GQv7UDsdw8gQAdK/6TWNxbdr9 At8urGA== X-Received: from pfcg3.prod.google.com ([2002:a05:6a00:23c3:b0:829:8b7d:2b76]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:2283:b0:82a:6461:6d15 with SMTP id d2e1a72fcca58-82f0c375d5cmr286204b3a.46.1775760509995; Thu, 09 Apr 2026 11:48:29 -0700 (PDT) Date: Thu, 9 Apr 2026 11:48:28 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260310234829.2608037-1-seanjc@google.com> <20260310234829.2608037-13-seanjc@google.com> Message-ID: Subject: Re: [PATCH 12/21] KVM: SEV: WARN on unhandled VM type when initializing VM From: Sean Christopherson To: Yan Zhao Cc: Paolo Bonzini , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Jethro Beekman , Alexander Potapenko , "Carlos =?utf-8?B?TMOzcGV6?=" Content-Type: text/plain; charset="us-ascii" On Thu, Apr 09, 2026, Yan Zhao wrote: > On Tue, Mar 10, 2026 at 04:48:20PM -0700, Sean Christopherson wrote: > > + default: > > + WARN_ONCE(1, "Unsupported VM type %lu", kvm->arch.vm_type); > After pulling the latest kvm-x86/next, I encountered this compilation warning: > "arch/x86/kvm/svm/sev.c:2954:30: error: format %lu expects argument of type long > unsigned int, but argument 2 has type int [-Werror=format=]", > > So, > > diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c > index 75d0c03d69bc..ca09c06d1e80 100644 > --- a/arch/x86/kvm/svm/sev.c > +++ b/arch/x86/kvm/svm/sev.c > @@ -2951,7 +2951,7 @@ void sev_vm_init(struct kvm *kvm) > to_kvm_sev_info(kvm)->need_init = true; > break; > default: > - WARN_ONCE(1, "Unsupported VM type %lu", kvm->arch.vm_type); > + WARN_ONCE(1, "Unsupported VM type %u", kvm->arch.vm_type); > break; > } > } I'll squash the above. How did you find this? E.g. did you cherry pick the commits into a different tree or something? AFAICT, thanks to commit 11bb4944f014 ("x86/bug: Implement WARN_ONCE()"), WARN() and WARN_ONCE() currently don't have any validation of the format. I posted a patch to address that gap[*], but it's driving me crazy that I can't reproduce the issue without explicitly removing the definition of HAVE_ARCH_BUG_FORMAT_ARGS. :-) [*] https://lore.kernel.org/all/20260409182941.1912856-1-seanjc@google.com