From nobody Mon Feb 9 01:29:33 2026 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (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 2605A32C31A for ; Tue, 30 Dec 2025 21:14:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767129246; cv=none; b=fov0GCCbL88ud+ldYIvInssHYlxwHjqDyEOfHvU9ucjz0cVeywRWytdeccoyWXrkUtzo0I6nay0YnoeHxnDe92Epnpuz4hcU04TIp42oxLykqECLISfbj/cYE5vLHSBUVZOUWnAxzNNGZsba9Fz3tjPiD0XuiaMjzJ19y5vu9Es= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767129246; c=relaxed/simple; bh=HJ4XqLT0jDF3jn5B2II3Oe/iMA/CkcZuvDCcogN2UCI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=fVz0QP/plRoHf3cLX+B0H4oDykGZiVyXfK1ifMzZqHLq38OR65tOZ2VzaDQ59yKJ4ijkTUudBj/F9qacU22MzH/H98ZmsQHaCOZK6JiGHrzflBUgI6uOG2zu9R6C7KRw5J5B69gvajAMrczVBqxHZ1pbuvxltoK90llb6V6tWzQ= 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=nuzBUEO/; arc=none smtp.client-ip=209.85.214.201 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="nuzBUEO/" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2a0bae9acd4so94573205ad.3 for ; Tue, 30 Dec 2025 13:14:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1767129244; x=1767734044; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=XsseyC8LpXkejrQLUQtTZ6AiUdHm1+Ya+dND1b51e8M=; b=nuzBUEO/r7GNfZDfupqYZ1tqabW2Q3sRxZHV2hwQSt0HkBg027pqwpUWuC+OXkgA+3 xbwKr2l8MOEWq6OFQomB62a9cfsP1uTdOKUBs74wErRnXvD7xpX5/BHprBzNIqOQoYc/ LQT4f0h8lm0ajXgkESKJDCCqrX76GX7Xm7jiLpWJMfG9HrpUtEIAvnIikZJcNvOTc2xQ 1BiSK6rjohIo7a6WT4/yH3LunjfMSU6EH1jAXRgavOrPkZDPFXWb0u/yR0E3gskAWkMh TrKNzoXFhYYzfuctk5w1JsxTsTwvI/KHs/XmADj69kugbnTirVC7xwSWVoarpSyCdoT6 w46A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767129244; x=1767734044; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=XsseyC8LpXkejrQLUQtTZ6AiUdHm1+Ya+dND1b51e8M=; b=gusNSYH/iJybDztOwMoKp9czpaD5XbyXdu9GuVI08Sldxp0S0gXRRxXyjWw6RMWpKn /NIZONRgDVq39LFj92bC5ZFZv9sO5jwCymSC8oGEXy20OXn0hAM8wXbwy0vH0I+YruJC cxUZVIU7oGoNqTQzudt/35H9b07kjtrxAUFHo9AsQ7XygVFi3V9ugWlAlqIrZdItBH75 kawWoRHPbLoeR6ypfM2sNaU7rrWeTCsbDwBWihFbIS23DKdBygJGKZ3oP4UPaWcX0LuU wH0ZimVEABtpmeMCge236en2CZ1IFKfTJqFBWTyCTl8KWU2md6JIdq75XKkENyZEVvyk ts4w== X-Forwarded-Encrypted: i=1; AJvYcCWzCpiicd7wM+4jNdoUYks1VrP9OdE0510ByokHBa/PY/VCQbl7OM9xTdfDg20+5KwJ/dqySg17/Tx4kZ8=@vger.kernel.org X-Gm-Message-State: AOJu0Yzj2zLazkkXvSS6JEgkeNxi+Wu17EZM2hqDqJilDji8Lj1u0oFm iKAEoh1YiYnBAYNCLe6L3tSjRhTek4myg/I3uYZof0/5Qul/MaYFlP7oOHL+kkzof37Az9XhQeg aW3yoJA== X-Google-Smtp-Source: AGHT+IE//Ytz9zMUfHCR02XePiAuIy+TlWHCW2xgVPHTiRzkpHTVtEE56Y8+nZktCmfwELz3dGzt6UzrllU= X-Received: from pjbnk22.prod.google.com ([2002:a17:90b:1956:b0:34c:4c6d:ad4f]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:f708:b0:298:efa:511f with SMTP id d9443c01a7336-2a2f283680cmr312460165ad.39.1767129244235; Tue, 30 Dec 2025 13:14:04 -0800 (PST) Reply-To: Sean Christopherson Date: Tue, 30 Dec 2025 13:13:47 -0800 In-Reply-To: <20251230211347.4099600-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251230211347.4099600-1-seanjc@google.com> X-Mailer: git-send-email 2.52.0.351.gbe84eed79e-goog Message-ID: <20251230211347.4099600-9-seanjc@google.com> Subject: [PATCH v2 8/8] KVM: SVM: Assert that Hyper-V's HV_SVM_EXITCODE_ENL == SVM_EXIT_SW From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Vitaly Kuznetsov , "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 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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(struc= t kvm_vcpu *vcpu) { struct vcpu_svm *svm =3D to_svm(vcpu); =20 + /* + * 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 !=3D SVM_EXIT_SW); + svm->vmcb->control.exit_code =3D HV_SVM_EXITCODE_ENL; svm->vmcb->control.exit_info_1 =3D HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH; svm->vmcb->control.exit_info_2 =3D 0; --=20 2.52.0.351.gbe84eed79e-goog