From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 E401228D8F1 for ; Mon, 23 Jun 2025 15:30:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750692610; cv=none; b=SKBK+wK3sQgTP0NlEYWjuETyFqfd0vszZrhBG4YiyTFCMGhAEeIkEfIFHwM0gSolLqsqwkC31cNvrVwQ/21vphrf7s4giu9VxMKxyI9yTK6EW3SwiDkJMlEL7P6Lgr5PhuszAUcwL889rZVACI4+CG/Fo2bj/6Xx+pQE0JNdSlc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750692610; c=relaxed/simple; bh=L/cfSGnSX28XY4cLKESl0PHduhleGIW8TtQJ6a7uSMg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=PKke9as3/eOlmffJ2KOs4XKO5NJoegsNhMc+l2Ms5cY+SmvTRG6s7qXLwFTUyvle4v534Ufytvo4N6PinqC0CMel+RH69dnT1JBoL9bA/VgRHUWqogHvEM/0cELFAqbLU3urH6Mo6fXxr1rPp9UhQbpoDdd8BGa3swdScKPe9uE= 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=1HXLUdgZ; arc=none smtp.client-ip=209.85.214.202 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="1HXLUdgZ" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-234f1acc707so39431045ad.3 for ; Mon, 23 Jun 2025 08:30:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1750692608; x=1751297408; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=KdWZjBOZrnoU5S/xxe3p4LyXR96yMFXC81nKL3+yk3w=; b=1HXLUdgZVdg9xeEiuy2UdlWq8CG+frtcwPIraHkPh1Z0IZR/XOszgOemOC9YPEEHUF q1KVailL+EelZxZFFnlv7upC65+yse/hTSHoBBz/ERawX5oR3desG7b0VTBS09vvZvFb 8elgoCsEbdSOBYsk0nRgVzeZ3y2YKMN08a3Fu3ARBfPlpjG5fk2Fso3ZR/vUyZ+b3Kpi nh1HcK1+BU5FSVb0R+UksyGgWza6Ynv4LCYKApBy2+Qd22nLHLUfwumkOmZO2DDzHYGT B4iMXs0XaG01QT//K7DBX0J7lZxPabgNl2ncelMKfh7w91fYGa8IBLRMJfz/XWX85lEr fR7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1750692608; x=1751297408; 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=KdWZjBOZrnoU5S/xxe3p4LyXR96yMFXC81nKL3+yk3w=; b=uax/wYHxVaa8sLxagRP2oL47j5kw0BNVZSVbwv9nxveYbj/FU+yFBHeIWA9xp8FMDd ayjjlGKvVhEaRdDIUC718G4OZt/3tmCOR8DIaWS2V2Pa2VgTFpYci1VMo56AiGndceuq 1l4fx6vP/MiZi3WRwaOuV50BRFWcFcGrIm0gtvj8zlxidPCMyWRvd069AR4oEktAwDEa xfbnwCAgFmIvdb3o91u6iCQOPfiOnhMDy3MM0EGJ5hp0BZEEWSXEwka+PY3XBmMY/VDu jWlTf6D20nsQ1r27qWhGxCXk1YPldSTl3NMkezeopycqdFEbByxmv3G2FFWkTzLUIERI NcrQ== X-Forwarded-Encrypted: i=1; AJvYcCUSqsHCIa6RZVpttQiT5SVT6i7rWGQtCchWwCSOo1fFm4UFw47NaSFu0P68zUzkzI/XVgjNi6Y=@lists.linux.dev X-Gm-Message-State: AOJu0YzoQV9dWEmr3nZYpMIhOaPERw6ZpryVqbUr+HXyovXptEV+l1n7 V4swjo+YoUDaAfYCAo4NBdDRJFZKmmlyNBE9wapQdRzmrLERCbjo052KjxKJDkz+8Xc8hXWPdCT jCNFL/g== X-Google-Smtp-Source: AGHT+IEMdoRNFqlp7zHt8uHjKfPleNVgWrvxFNisVXQLf3SXuV2EWfHq7AYIrMPraED+yf8roaT/XGVYptg= X-Received: from plhw5.prod.google.com ([2002:a17:903:2f45:b0:234:a456:85ba]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:da8c:b0:236:6e4f:d439 with SMTP id d9443c01a7336-237d9965716mr203757385ad.23.1750692608274; Mon, 23 Jun 2025 08:30:08 -0700 (PDT) Date: Mon, 23 Jun 2025 08:30:07 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250611224604.313496-2-seanjc@google.com> <20250611224604.313496-20-seanjc@google.com> Message-ID: Subject: Re: [PATCH v3 18/62] KVM: SVM: Disable (x2)AVIC IPI virtualization if CPU has erratum #1235 From: Sean Christopherson To: Naveen N Rao Cc: Marc Zyngier , Oliver Upton , Paolo Bonzini , Joerg Roedel , David Woodhouse , Lu Baolu , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Sairaj Kodilkar , Vasant Hegde , Maxim Levitsky , Joao Martins , Francesco Lavra , David Matlack Content-Type: text/plain; charset="us-ascii" On Mon, Jun 23, 2025, Naveen N Rao wrote: > On Wed, Jun 11, 2025 at 03:45:21PM -0700, Sean Christopherson wrote: > > diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c > > index 48c737e1200a..bf8b59556373 100644 > > --- a/arch/x86/kvm/svm/avic.c > > +++ b/arch/x86/kvm/svm/avic.c > > @@ -1187,6 +1187,14 @@ bool avic_hardware_setup(void) > > if (x2avic_enabled) > > pr_info("x2AVIC enabled\n"); > > > > + /* > > + * Disable IPI virtualization for AMD Family 17h CPUs (Zen1 and Zen2) > > + * due to erratum 1235, which results in missed GA log events and thus > ^^^^^^^^^^^^^ > Not sure I understand the reference to GA log events here -- those are > only for device interrupts and not IPIs. Doh, you're absolutely right. I'll fix to this when applying: /* * Disable IPI virtualization for AMD Family 17h CPUs (Zen1 and Zen2) * due to erratum 1235, which results in missed VM-Exits on the sender * and thus missed wake events for blocking vCPUs due to the CPU * failing to see a software update to clear IsRunning. */