From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (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 A79BF2857F2 for ; Mon, 19 May 2025 15:53:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747670011; cv=none; b=mWW9gm/EzBN6ulXoFq8LmiWrwUAA8wfncJrTAEXREXlQuROmdvwFlSZ17B43hnu8dWRf4N0dC5k6J2CHzqJ7D/S/5L7wUvgy2K3ug5+UhDYdSv796evEjFHUjyIFVVsVokJKFwfz/5kteCCSFvnRnAnWxEpMmLKzd9O8FpG+Ae8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747670011; c=relaxed/simple; bh=f59pVrQSzamcQu31ILmhJttkN2VQd05tIodMXLoerNc=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=uqUtOo1lPFS/UFJwMX6geaMRqe4Yb7w4/QgOvXaDSYKk0l7iAzKquPjNDK1eTC5M+h8Wis8ymyInbBqVxyQoGuqBdlkDqJYZGeRh0TtoSN15m9w/u7M4LZJzlEK2nVJ9dm7B8cHnZ898M2/nruO0EsxNVuuTn1LuJNL9jZ1VYPU= 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=LREYk3vh; arc=none smtp.client-ip=209.85.216.74 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="LREYk3vh" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-30e78145dc4so4701821a91.2 for ; Mon, 19 May 2025 08:53:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1747670009; x=1748274809; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:from:to:cc:subject:date:message-id :reply-to; bh=f59pVrQSzamcQu31ILmhJttkN2VQd05tIodMXLoerNc=; b=LREYk3vh6UQi/QQ4Tb5cOwH8gfD06ERnziOt/UWsDjNM7UHzo4CDXzN7PSTIOzJ/zR xejpFKJ94ndQH+AJrRFqatP2jVbJ19bcTUOZQYThv3cyjTHiReZ2HtsvfOf/UgUz7mBb t75CE+poFHRmiaVKNfjPjODs9cs5+hIm76BPLUTIvk2uCw6S1hZOLC3ZL+nZvtSgovS7 5zw0atlefgrahONdeRKAtfz79FH+X4qUX5icNM2EbJMUl8C3FcaD/iDbqxYFX0han66Q 65epd5Mvyb2JEBmhlWEtvrOZKbW/TYxz+bjCKiWkA278mYXQyzerG+kFZC4EXFSHi2Te gYwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747670009; x=1748274809; h=content-transfer-encoding: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=f59pVrQSzamcQu31ILmhJttkN2VQd05tIodMXLoerNc=; b=Fj7QaKC19ppxl/5O2+HF8SZHEAdeQmR+0Gnm3963TOAZkkTvNNVC0geHdf5hbHAPdr J0wXwS9LclcjB59obVqS8QySkH9y7db9MVgXGk/CSUN7Mk8inY6GRKtFkJ9wcap9peeh TcXJ45PAyDCQweb3BpqN15I/8EHgtYqlHUWei+aDyReLuMoOEu+Ybdrkwz8FUkl9bkEa Ncaz0xn4uOk2uC4ENxH30XRZRJm4Wv1PDIptrOllS8CRnk3oUtUghHN75ybrE2bOYu6V 21+2m1T11rhhSc9V5pWZ9I1rPpf/qHicyoHCfIS+jbpHEauZ6iWlULx/M0ARD6PntjO7 drjQ== X-Forwarded-Encrypted: i=1; AJvYcCVxPvgb59cHSf+abRO2+M4CgVND6omzoElH2B5YKguNKG62x04mO3WjKLpCPA1twJIsCkYIUTw6L0lhEc8=@vger.kernel.org X-Gm-Message-State: AOJu0YwyaUqDBff/Tx2wN8sxXpU76OZrOKMbTebGtHhVZe2iYj4yNy68 r4M7WTX+CXg/anJFElijTsD2Ap1KJSFAOldClewCTeOk1AjIRL15uE0hCooFUXnKFHeNp9lCedl M1B70Ag== X-Google-Smtp-Source: AGHT+IFU/A3VDHWmL2TsR6ssZbZVaj/CD2h7APNk9scNpNaj+ntp365tmw5VsXzeWgj0D39p8KDKm8gRc0Y= X-Received: from pjbph13.prod.google.com ([2002:a17:90b:3bcd:b0:2ea:aa56:49c]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:394d:b0:2ee:d024:e4fc with SMTP id 98e67ed59e1d1-30e7d5bb433mr24391612a91.33.1747670008886; Mon, 19 May 2025 08:53:28 -0700 (PDT) Date: Mon, 19 May 2025 08:53:27 -0700 In-Reply-To: <34609df5b649ca9f53dfe6f5a134445f1c17279a.camel@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250519023613.30329-1-yan.y.zhao@intel.com> <20250519023737.30360-1-yan.y.zhao@intel.com> <8f9df54a-ada6-4887-9537-de2a51eff841@intel.com> <34609df5b649ca9f53dfe6f5a134445f1c17279a.camel@intel.com> Message-ID: Subject: Re: [PATCH 1/2] KVM: x86/mmu: Add RET_PF_RETRY_INVALID_SLOT for fault retry on invalid slot From: Sean Christopherson To: Rick P Edgecombe Cc: Reinette Chatre , Yan Y Zhao , "kvm@vger.kernel.org" , "pbonzini@redhat.com" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Mon, May 19, 2025, Rick P Edgecombe wrote: > On Mon, 2025-05-19 at 08:05 -0700, Reinette Chatre wrote: > > > Was this hit by a real VMM?=C2=A0 If so, why is a TDX VMM removing a = memslot > > > without kicking vCPUs out of KVM? > >=20 > > No, this was not hit by a real VMM. This was hit by a TDX MMU stress te= st > > (built on top of [1]) that is still under development. >=20 > Yea, the context is that this TDX MMU stress test has grown more and more > stressful. Mostly it has found TDX module issues. But recently it added t= his > case which turned out to be a general issue. The TDX specific MMU stress = test is > not ready yet, so Yan added the case to the general test and fixed it for= both > VM types. >=20 > For TDX, since it's an pretty edge case and nothing catastrophic happens,= I'd > prefer to not rush a fix into the TDX PR. Yeah, and I'd prefer not to bleed these details into userspace (or into KVM= in general), hence my question about whether or not a "real" VMM hit this. Thanks!