From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 CD7993D9DDF for ; Tue, 28 Apr 2026 17:23:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777397007; cv=none; b=Qy47hOoq3bD5y4S/MPcsQXEeRZf63smQ2/QBExTkuUE5IPz7cjNj8SltDQBBJZjBVd0rPto80Kou6eWczomsi3Pvz5fkidRYb90Nw5+sGvxilL0jN/pGsDBvptw5ebJEMW8dP9XLlj9T3UekrKMv3bfS6HzKZJqvBIZaLM0ZAd4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777397007; c=relaxed/simple; bh=3aMdOtMpqlBTT24ejBqMq7bPGzf+z94awI41Ku254OQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=FC9wGfrg5UaOvOimJDn93MciLjL8lnVU2ACNzzuCqhClxUAvie7MGTsDypDZ0xFX7lFviCHfj1Q3vy5hqocYGziE3LQtGrgNXMcOYg4YHb0Iby6QteiNovDUgK7A/y8pbxZjn0akfPu3yZtTuFdp0eXoUCj4hCLy7UR80BzHMzI= 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=AmSvDPUw; arc=none smtp.client-ip=209.85.215.202 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="AmSvDPUw" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-c6e24ee93a6so33704a12.0 for ; Tue, 28 Apr 2026 10:23:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777397004; x=1778001804; 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=3aMdOtMpqlBTT24ejBqMq7bPGzf+z94awI41Ku254OQ=; b=AmSvDPUwzS5PV7ATUYNBXU/Tmg141K0FcFKNc09gLIya9Isd1DnyU5fsq/JWliYwx4 PiM9FJFTlDF6f7Xo2BGUrjkp0mMf/cSBFPg0LlS7gcQBIVRWaPSiaI/Ps5QGzPK96hkU +FgUiVpfh7nuIlLpHh9MKlRF94l9hgo4Iv58xtV+nxLoP/GWYdHXFgNaZG1DmKoFjfkf wdx+6fFMNyXTYMZJ6m1f6VVTFPKNrWUyWUk7QuZslWAHTj49FyqPnfMZesbHSGfHxPD0 sTDERulTcLDp/LWQ4kZa7rP7tvpmaQ+FvFtrDasG47clQbU3gKegCf6YcS9641LpHUpw PvDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777397004; x=1778001804; 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=3aMdOtMpqlBTT24ejBqMq7bPGzf+z94awI41Ku254OQ=; b=G8ddSii5mT0KcHHhNStbgFvidlfS9EyNB2IMbGrK713aU2YqknlH+/phK3OAfqyog6 pYig5zZxMhZyrpuezM89JGfhKgEPlfA8EDjHM572xHJftgrjpmkfj3SlpGUqdTpc4Zdf BRuZZGNm8Y9SEE0FuQ0WD/yAk2Ybv5Y0Ji43F0bWWjW+erCnLCvgvceYbpO/vxFTPmVS nv/uOO1YjtwIohOxJR4020nXwJRq3YNfdeqHfhUNvVfNKMjpeGFMdv53LdLWR7qwngMw VGua/Q6OPzMIaKveQwXfWWzQtene1nBhR18OrlP63xXy53eSOQZuK+XlmnUEcqa3iPy9 ww5Q== X-Gm-Message-State: AOJu0YwaB3z2Y+qPQJbd75wLjg6b3WPmhTLVgP20D4ex+bDuMxb5/BrI guMdVzW4X9lNBOQ9ulOp3zrl9sQLUsWSWUA0dytHi5Rl+1kMPzjyzNdoTYG5iHneWCRxI4LjPCJ DrO+poA== X-Received: from pfbmb8.prod.google.com ([2002:a05:6a00:7608:b0:82f:60a5:8a3d]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:32a0:b0:3a0:c285:e511 with SMTP id adf61e73a8af0-3a39c653fa5mr3681088637.24.1777397003609; Tue, 28 Apr 2026 10:23:23 -0700 (PDT) Date: Tue, 28 Apr 2026 10:23:22 -0700 In-Reply-To: <20260428120545.1970058-6-d-tatianin@yandex-team.ru> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260428120545.1970058-1-d-tatianin@yandex-team.ru> <20260428120545.1970058-6-d-tatianin@yandex-team.ru> Message-ID: Subject: Re: [PATCH 6.6.y 5/5] x86/bugs: KVM: Add support for SRSO_MSR_FIX From: Sean Christopherson To: Daniil Tatianin Cc: stable@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Peter Zijlstra , Josh Poimboeuf , Pawan Gupta , Greg Kroah-Hartman , Tom Lendacky , Sasha Levin , "Xin Li (Intel)" , Daniel Sneddon , "Ahmed S. Darwish" , Nikunj A Dadhania Content-Type: text/plain; charset="us-ascii" On Tue, Apr 28, 2026, Daniil Tatianin wrote: > [ Upstream commit 8442df2b49ed9bcd67833ad4f091d15ac91efd00 ] This shouldn't be backported without also grabbing upstream commit e3417ab75ab2 ("KVM: SVM: Set/clear SRSO's BP_SPEC_REDUCE on 0 <=> 1 VM count transitions"), otherwise non-KVM workloads will get hit with performance regressions without any benefit (to them).