From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6323A377558 for ; Tue, 19 May 2026 19:54:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779220466; cv=none; b=Vj2R2L491g+lUFGJ5KTX+3k0RI65aJ5crS/eO+2EOb2xmOqIpueACRhEIhZaxMl/hb6CO54qVWy+iRX2wxd1eojU5MXxOnt1o+mnA7n5GTYbWHYPSNcMHB+vP2XWZpJapBMgjOUvoAGvgmBRz+QPmHaY4enYliG6Iuu+w6wf3g8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779220466; c=relaxed/simple; bh=6tfGb49ZRedzfCouA50bV3/0wXxsxoJ4fIw9A0Ifz4U=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=cXBQr9lVTdToNCwJyXSNkEZ/rLDzHOJeZA8xO/MZ3MEYBpGydj8db5bWFgB6Nt9IVwByRntR/OaSZ04Q+yVfBtF9oNcVdh+mgmK9qL6vFn/1eyaVHxo5GaUhEAxfcTcj+NKZSe2KOGwgR2KKCl//uK8F7WSLy2RxCZWAED64rTo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=ivKep9oo; arc=none smtp.client-ip=209.85.214.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ivKep9oo" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2babbeff9e4so42433305ad.0 for ; Tue, 19 May 2026 12:54:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1779220465; x=1779825265; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=qAVfvuPEzTQrhFN0ZRU1W9jX6cZgBZO1ZxbdghzeH5g=; b=ivKep9oo+fInZx3A0ifdL26qwEgErdKKTa40FI37QuDEMbwDZN+dOozCpEotRxO9uA jfKjGnMgN7mHGI+/PTcPkV4tssG0bDx5QNe9s+RqcUlIj6AcC/b6dXxXSZJOy6NAAEYr GncMEWFnTLICjb+FsZalDOIfplHq2T/XPxsnSr3N+aOMo4Ay7We1bZeSXx058++NUoqO /qmxEzHuQYcM0dq36IUdNthEPqJRJRv4D+PTZOCFKedoFb6UQ8ldb7yWsFl0htlNg4h9 gYaOU/buzppAeSzO4IKI/kVxDMVHUqzVN8+eEHr96izakEnXlUIL2FGmj4sBdLGg7Y8R LAag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779220465; x=1779825265; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=qAVfvuPEzTQrhFN0ZRU1W9jX6cZgBZO1ZxbdghzeH5g=; b=i5AMtPcTPpSbOYFDxyhZo6KdrfI8Eq2AyrdpJG+heGa82d7UvhwWo4y2PbDO3jaV+8 ZepfIhXSeqahl+u1nLmu5OtOppHGbi4DtKOp88VeSh05ixJX8caJS1JGKdMeKe+X+e03 oQqS3Hkf9Yh3SlnRsVVJMP3xyVXVlBu7WYW3RJ0c7M2oA9+VSdBGrx2v6AkPGVA0vxd3 IA+ahCuIsv1hGlPLiAPaK48lVJLWhpAGwtC88Mn/LNHBm1RpG8NaJebyNAaOMJpaI62s 72s/KmBlHZ6tBa6mSwgsAqg0nP9hHh4zR1ryfORy9ZyvhqgM4WupBfr9hi0ZX6ggwa4V fHqw== X-Forwarded-Encrypted: i=1; AFNElJ/lQqL7Olj1LCBf6hC5kFAcRY2mTuRMDFaOmQ1YVSzwA6geY+L+88yXTRmarBDiCF+ZJbBqbcgyLEMgzPt5M7M=@vger.kernel.org X-Gm-Message-State: AOJu0YwPYmSgJWYERVsSuOvw4ToC3Gw4uR5apIvPNPF4grJjGvQf0CPB 2XJgE+3VnXE5X2Ca0YoDY3ycmJNJ7jfEmzhbPmWxkTVjLI5N+kexpOKaV0I76VMd8/1HYWBaX+J SrzKFfQ== X-Received: from plgq11.prod.google.com ([2002:a17:902:eb8b:b0:2b0:6cdd:87e2]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:758b:b0:2ba:838b:bfae with SMTP id d9443c01a7336-2bd7e93d8b2mr127872135ad.18.1779220464419; Tue, 19 May 2026 12:54:24 -0700 (PDT) Date: Tue, 19 May 2026 12:54:23 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260518070943.2091287-1-ZongYao.Chen@linux.alibaba.com> <20260518070943.2091287-3-ZongYao.Chen@linux.alibaba.com> Message-ID: Subject: Re: [PATCH 2/2] KVM: selftests: Test guest_memfd binding overlap without GPA overlap From: Sean Christopherson To: Ackerley Tng Cc: ZongYao.Chen@linux.alibaba.com, Paolo Bonzini , kvm@vger.kernel.org, Shuah Khan , "Kirill A . Shutemov" , Chao Peng , Xiaoyao Li , Tianjia Zhang , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" On Tue, May 19, 2026, Ackerley Tng wrote: > Sean Christopherson writes: > > @@ -542,6 +542,26 @@ static void test_add_overlapping_private_memory_regions(void) > > TEST_ASSERT(r == -1 && errno == EEXIST, "%s", > > "Overlapping guest_memfd() bindings should fail with EEXIST"); > > > > + /* > > + * Repeat the overlap tests, but so that there is overlap in the > > + * guest_memfd bindings (i.e. in guest_memfd file offsets), but _not_ > > + * in the GPA space. Regardless of where there's overlap, KVM should > > + * return -EEXIST. > > + */ > > + r = __vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_GUEST_MEMFD, > > + MEM_REGION_GPA, > > + MEM_REGION_SIZE * 2, > > + 0, memfd, MEM_REGION_SIZE); > > + TEST_ASSERT(r == -1 && errno == EEXIST, "%s", > > + "Overlapping guest_memfd() bindings should fail with EEXIST"); > > + > > + /* And now the back half of the other slot's guest_memfd binding. */ > > + r = __vm_set_user_memory_region2(vm, MEM_REGION_SLOT, KVM_MEM_GUEST_MEMFD, > > + MEM_REGION_GPA, > > + MEM_REGION_SIZE * 2, > > + 0, memfd, MEM_REGION_SIZE * 3); > > + TEST_ASSERT(r == -1 && errno == EEXIST, "%s", > > + "Overlapping guest_memfd() bindings should fail with EEXIST"); > > I just noticed this is kind of odd, what is the purpose of "%s" and then > filling the string in with a hardcoded string? Purely oversight. I didn't even see it until you said something :-)