From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F31DE2D24BC for ; Fri, 2 Jan 2026 09:59:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767347949; cv=none; b=CscYmYQoIyHCAbGoOrkTgcBW7cO95TqlGwZ2BDDJTU27nTeHVrfOXlc0QrTI0QTmpb7TadlSHAjPhWRfOHu5XAcwKZL0HQXdx+QwiN/CfEyRTCLj2mPZezHhtN8BXZTRruuGtPUtI/2vR/GOpYWdUxouwq4ZSB4ukPseXLq7j1w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767347949; c=relaxed/simple; bh=xwN5SJgpKv5d/dw9zKfPpCMUcx2M/mX4rbiBa7U8+Ns=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=ruPeKQwblpTy2Wr52b+ze2L+bOm462Ojxll4proE9hn6vmkpd37qHPxtq0LFOmOhRO5oSvTebsoPBJ0qP+h+3chisuvJq08F+rqWVN7up/aH+7ap2uXjFuRgMjvNdW+7w/U36d6eaI86SGhmc1dsx0Z2WO8WZRZCfbY0UaZDRsM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=GMloNzx3; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=lLEsGTuY; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GMloNzx3"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="lLEsGTuY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1767347944; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=PUxS4f8mPvClX+DwiPHnFyp+SWqUM3DkFf5Rfhn2JeY=; b=GMloNzx32+ACrjXAQVORfp1FqDyJ5mMWA47oRD0PI60h44XBYZA1JEE12hDY9UsdBKm5lA mAydsRgtLOjWem6VBMU1fxugdLUEu5IWh8/J4WmYtnaTkXyG/NzLqImLO4Ti/9oNW87Ymg JuXSkzvS5doZI1YNs/CJRFz9i20bTnk= Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-50-gVlYDGR_PkGsV8q2XBGwOg-1; Fri, 02 Jan 2026 04:59:03 -0500 X-MC-Unique: gVlYDGR_PkGsV8q2XBGwOg-1 X-Mimecast-MFC-AGG-ID: gVlYDGR_PkGsV8q2XBGwOg_1767347942 Received: by mail-wr1-f71.google.com with SMTP id ffacd0b85a97d-430f5dcd4d3so6496496f8f.1 for ; Fri, 02 Jan 2026 01:59:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1767347942; x=1767952742; darn=vger.kernel.org; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=PUxS4f8mPvClX+DwiPHnFyp+SWqUM3DkFf5Rfhn2JeY=; b=lLEsGTuY8U/CWI/26HlcDFTaNpeLJUNCGkYyXSlhQ8hbSDR3vKmqoQCIu3wIF0/cDq 2xZfnRLBFQsrAdcm8Z8SpWCuIGUwB2qIfmZ5FG+/xQVVtQT0YTKbj2wjrkhYC6H0TFIv s0yV+cmoB3IzlobwMb3hX5QiTzD3rVqTMaGDo/77LWodWmieepLR5pE7pQ95EeX9EVCZ e1AXxGhayydsfZDfFRPGwvKj8OwaI0KxULEMh0nfPJtxA4paQusEOkiSqOy46QGoNkDY 2UH3U5ACx80VsEx4OBAIgS+60ILP7RUO0vF6cS2QD3Z6w3CBJ3B42canI77tC1aKK7A7 CNEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767347942; x=1767952742; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=PUxS4f8mPvClX+DwiPHnFyp+SWqUM3DkFf5Rfhn2JeY=; b=IJOz57KqfHPH9RFefmQupMDtW+1RVQMPfTRqGYb85+4P4llmgo6NrkZxf69HKpHXkx w2z82MXFEOYmfiuP1iiGf6GEpBcg2+/VTz3ApvNIG2AxOsJkRBjJgoAnORiWrCuy/z8E aRYxbqW4tIC8R53uXY7yS27xwz63IJAoxhLeBfDbCd5H7xuXwZiX9MIadKTecCukomOb bkLfkkdmtkZ+HUTCyhdlrR6cSXtPdrguxY5did/bvx0jfApEW378oCw55ESF5J0nGX83 kgPX8UhoA/fXuFqaBJ3GeLJ6DBpDc+9cQNvBmerD1+iwS895Mis4xxITUdqYh3WQCt/o lanA== X-Forwarded-Encrypted: i=1; AJvYcCVicBwexzlTY0q0ReJzfLhOLYmRyjaBM2xPecZJAtL6/0mBGxix8mvT1d6mmFLGE5ZsSjqI2gJm5NOtNK8=@vger.kernel.org X-Gm-Message-State: AOJu0YwW7Lr8aD/BEuvfz6vQBiKhX8+MTp1aCdxFtDj6l7pL576QYYQq SMZRV5SenCSMB/ht8wDr6dqxgOaqHgeVT/3RQN/HTec2aO/UOD7OzXvgK1Cp+tgCE2SuOoYRAEi EMSDirIJ1SACJ9o9WUEwDrIaG6949kSE9fsJC+d4hSvLO+X7u88iPcCL+NywipdulXg== X-Gm-Gg: AY/fxX7/fCrnh+OGp4wqsOx/dHPSbOTVcS0jMj/3UYkqbtGprBEtKCkAWZHTbN9/zoG /WpVfDnJE78VWODkbJg9s50fw2WJqEPzn21DacZGeC9wsAykTfisTtL6+MLlGCGUcp+zKonduzU dZDGdg7wKdKH0gbnbK87D0NMVdijm7qHHxAPFE1b4QX22yPcxOyXLcecLuo9oQt5niUX637w6zl YXR4EWSnPg8BN5MuCZn2/5KYu4FMtO0LK8VGDPofArmJC4qyYI0aSjI3i9CBFUbxl2ssjS4X6pz WUmtv857k0xU7z8czUAbSHULbldkfdbOCSXfn+5UftpDAGgrgs8O0uIVN2Db95NBLco4r1mj23a 9cKu1AA== X-Received: by 2002:a05:6000:1052:b0:432:84f0:9683 with SMTP id ffacd0b85a97d-43284f0971dmr22484618f8f.24.1767347942190; Fri, 02 Jan 2026 01:59:02 -0800 (PST) X-Google-Smtp-Source: AGHT+IHXb22RGg1w4fy3z8I/bvF7q1MbAh1dJe/WDLMVTEQmMTtkYSsT5t/aZbCWXfL696OPjB6p8w== X-Received: by 2002:a05:6000:1052:b0:432:84f0:9683 with SMTP id ffacd0b85a97d-43284f0971dmr22484602f8f.24.1767347941743; Fri, 02 Jan 2026 01:59:01 -0800 (PST) Received: from fedora (g3.ign.cz. [91.219.240.17]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4324ea1b1b1sm83175299f8f.3.2026.01.02.01.59.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Jan 2026 01:59:01 -0800 (PST) From: Vitaly Kuznetsov To: Sean Christopherson , Paolo Bonzini , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li Cc: kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, Jim Mattson , Yosry Ahmed Subject: Re: [PATCH v2 8/8] KVM: SVM: Assert that Hyper-V's HV_SVM_EXITCODE_ENL == SVM_EXIT_SW In-Reply-To: <20251230211347.4099600-9-seanjc@google.com> References: <20251230211347.4099600-1-seanjc@google.com> <20251230211347.4099600-9-seanjc@google.com> Date: Fri, 02 Jan 2026 10:58:59 +0100 Message-ID: <87eco8bajg.fsf@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Sean Christopherson writes: > Add a build-time assertiont that Hyper-V's "enlightened" exit code is that, > same as the AMD-defined "Reserved for Host" exit code, mostly to help > readers connect the dots and understand why synthesizing a software-defined > exit code is safe/ok. > > Signed-off-by: Sean Christopherson > --- > arch/x86/kvm/svm/hyperv.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/x86/kvm/svm/hyperv.c b/arch/x86/kvm/svm/hyperv.c > index 3ec580d687f5..4f24dcb45116 100644 > --- a/arch/x86/kvm/svm/hyperv.c > +++ b/arch/x86/kvm/svm/hyperv.c > @@ -10,6 +10,12 @@ void svm_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu) > { > struct vcpu_svm *svm = to_svm(vcpu); > > + /* > + * The exit code used by Hyper-V for software-defined exits is reserved > + * by AMD specifically for such use cases. > + */ > + BUILD_BUG_ON(HV_SVM_EXITCODE_ENL != SVM_EXIT_SW); > + > svm->vmcb->control.exit_code = HV_SVM_EXITCODE_ENL; > svm->vmcb->control.exit_info_1 = HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH; > svm->vmcb->control.exit_info_2 = 0; Reviewed-by: Vitaly Kuznetsov Alternatively (or additionally?) to BUG_ON, I guess we could've #define HV_SVM_EXITCODE_ENL SVM_EXIT_SW unless including SVM's headers into include/hyperv/hvgdk.h is too big of a mess. -- Vitaly