From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (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 8CC2B472794 for ; Thu, 30 Apr 2026 17:50:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777571402; cv=none; b=agRKiqfCIGMsN+2MK6JJBCI1DOfsPw7GIXmWWhBnljQk0KARat7oNi2UsgMUq94Q1/5GG5xEL/5QxKzQ91Q7osL8fxlZ9CZIhwVaPOrziTVNC3e2K54RNDQYmqVUt+1Z6bzUFAP2t8zQDdce24pN56DJoFMIBrgvad4OLAjfufw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777571402; c=relaxed/simple; bh=bAo8v4msbUQnPcMyR7HVCpTLMFUCUyjlyaQuBRHlX14=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=tVl7KjNJ3VgDXtEUfq2bCnf8aPTiE/n2OE/X6jwpQ6dgIPHXMKCgpjr1L/QqW0O/JbiTj71r0DJYNL9KHZOj592iv/GkqNz9fIfMWX1pKeXeIKZaVHmFfwk9zrGYZdTa+ptR/tbTi+dh5zecArHuv3vg5IwUDKEA2IbCpv2xCHI= 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=EBaNlHRT; arc=none smtp.client-ip=209.85.216.73 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="EBaNlHRT" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-362d9dd9a49so1359694a91.0 for ; Thu, 30 Apr 2026 10:50:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777571401; x=1778176201; 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=W5etxh7iVspx/KsrA2k+irf74wVM21/2JymPeDe2+4s=; b=EBaNlHRTgy2fYzrT8JfKjoJrhT8JhQhlpcApXuc8xVz2/qbb2w4+eZS5d27+UiLEXA +DJUQSOZExJmPr55Tp+h9QYOoStBr6g4fa/DMje4kh+8l78tIEP9AmbbLbOLFb4k7Q4p 0cnByE+SMRVrcJLjMvRjqgfchZA+O+mK6m5+uD/z5tJqLlwOrf7I333quGXvL45+g986 FHSX9olmHABr4SJdwC90jVfHpK+j/OADFFZiJJHLt4QwtHYPkro2e4ccagpARxwlzMNc EDR7HuCo6J3s0phJhJ4KKyZptxjfBvR4KiEKeqFcwaIiRiDBSY4XJE+gPUjBXWGF15LG DV6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777571401; x=1778176201; 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=W5etxh7iVspx/KsrA2k+irf74wVM21/2JymPeDe2+4s=; b=LhukH4q3889eKnbuVrYDEhux6XtR+6sIouVoZw3sCe9O0H7qkrE/fe62bYeat/ZbFR eu2kAIfrR4SeXVhW+1JdFDhmot406MEPUfLkmdESmNFkt3clJwWRKrIf+Kv1+XRUMvU3 HjHSIYKRObGeXnSbTYu8Uzo0NKMLbHnv1dbqjdYE84V1/vzVgB7KanRdp4yWcrm6K/TO Z+JdxiBkImNimfolJT8K7F9UNpDj4YICB6a/2B9kSWa/fTPQwxug6+8+YW46ygs6F/tQ DszgYe3+mSkmyNliJoqH9ysU5Y5zMGpZ9N1zilpGPLwj7vOVzbBvLij6tIeK4P5M9hJo WyFA== X-Gm-Message-State: AOJu0YywX8TRKSXsRfEW4wUfoi1tSGJEiJglgoQ8KBKmwyZcD/sHDFA0 JfWRE3zb2Hagi5RXlp/fzbuxrj7UEQIXGHhPHKjWwVIeAkmXOev+pGQHW6Gx8giu/eSJ2q/a8Xh amfBh/w== X-Received: from pjom3.prod.google.com ([2002:a17:90a:9203:b0:35e:53dc:9197]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:3812:b0:35f:b5df:448 with SMTP id 98e67ed59e1d1-364c30ed945mr4048979a91.24.1777571400802; Thu, 30 Apr 2026 10:50:00 -0700 (PDT) Date: Thu, 30 Apr 2026 10:49:59 -0700 In-Reply-To: <20260429171550.srso-zen5-6.6.y@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260428214610.2138600-1-d-tatianin@yandex-team.ru> <20260429171550.srso-zen5-6.6.y@kernel.org> Message-ID: Subject: Re: [PATCH 6.6.y v1 0/6] SRSO handling for Zen5 CPUs From: Sean Christopherson To: Sasha Levin Cc: stable@vger.kernel.org, Daniil Tatianin , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Peter Zijlstra , Josh Poimboeuf , Pawan Gupta , Greg Kroah-Hartman , Tom Lendacky , "Xin Li (Intel)" , Daniel Sneddon , "Ahmed S. Darwish" , Nikunj A Dadhania Content-Type: text/plain; charset="us-ascii" On Wed, Apr 29, 2026, Sasha Levin wrote: > On Wed, Apr 29, 2026 at 12:46:04AM +0300, Daniil Tatianin wrote: > > This series backports a few SRSO handling features for Zen5 CPUs from the > > mainline kernel. The only important ones are > > "x86/bugs: KVM: Add support for SRSO_MSR_FIX" and > > "x86/bugs: Add SRSO_USER_KERNEL_NO support". The rest are added to avoid > > conflicts when applying the aforementioned patches. > > > > Changes since v0: > > - Add e3417ab75ab2 ("KVM: SVM: Set/clear SRSO's BP_SPEC_REDUCE on 0 <=> 1 VM count transitions") > > to fix a performance regression introduced by 8442df2b49ed ("x86/bugs: KVM: Add support for SRSO_MSR_FIX") > > (Suggested by Sean Christopherson) > > Sean, are you OK with this 6.6.y backport as it stands? Looks good from a KVM perspective, but someone that knows the x86/bugs side of things should take a look at the non-KVM changes.