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 7B823288517 for ; Fri, 23 May 2025 01:01:06 +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=1747962069; cv=none; b=AKBv9MtJnK+1fJlaNAeY9l+MjoQrFyOjZujCy8DhHh2sMu2M+4Jbgyp5KfKgDYPdnrRQL0urxk3F5yw44Z1K5u+iToVzXCqx3I/nFoorcx5UR8l5tdk4Tl7zGB0VcgCLx9g2w8SSymvby2I26HhlRM2GsBN/cW8R2wRIoGrpqrs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747962069; c=relaxed/simple; bh=D8FN8kkLx7L8tVrUTR+61zNHHfC5qjIkeg2WDBKUnVA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=KH8aRmDFhFK4TR1Yp4e9TdjqT6ecCJIjuPUaeO0ueC6H426R76Ny4qboHwtGZaPeV1PCx93N/R/0eoKnTTHwY0IisKgJLKDkHhKMMkN4BcaX4uJAkOOpP9BfDsNGih3mGNZT0J03t+ayWlQ/Y6p2l8Jcg6fCGQZRLkDDDyMAH3w= 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=OC31/hYC; 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="OC31/hYC" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-30e9e81d4b0so8246672a91.3 for ; Thu, 22 May 2025 18:01:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1747962066; x=1748566866; darn=lists.linux.dev; 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=a8iEK4WECydE0ey1yGfRxrlymXScvl+S1HRsDMKm8xs=; b=OC31/hYCdsd/WTEfh50jXxAi+ComkAXiGGhEj86SX+VSXooHVp+ScsdOXGBzsG/iZu DdFZWJfna6qhcRHBEYktvWbnK7WzUdK5/le7ufJgcQcKxO9ebr3rilkRjuTCzkjsarjN +Ne8SdXZLJpiJ9Q2MTYyxWiOs1cLBv4MaWGLLV0Vtv+q7bwt8vcBhGQcTHgef0glGvlk iY6xRX7joVQDJNXH1FviG/QGgdHQsToN7WEAxvgvZonrEPgADlXoOKLbrrAl0xqNqHZ/ tho+WVlQ5botF1oRAyZypwsqaFC7020jy/Z9ESLk+s2TfQbk0iM9xsyuXbzHTSJ8uEgf q20Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747962066; x=1748566866; 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=a8iEK4WECydE0ey1yGfRxrlymXScvl+S1HRsDMKm8xs=; b=WLfuq4Lp+DxYHmiXT3TYF9QSvzpvJ5RzHgH+2xVfDCp2JmYRKGucV8518XRq91UCCB XP8bLY3907/gJUfv6GgtkEht8xrdwNIRO5cDFM8q6uwYn0CBXk/XaTJFkWilh7Sv/1dw kE0vxCbG/jODIbSzd3g+4kdeGD/5R03j1/BBArFfBXJwzbfKim3036r34imKUI/6ehn6 CVdv1JF0hAd4iNO//4cf4WNfeEdL2l936u7MVG09joT7AJyqD1B15YEHqAMsQzHYqwme G4PtXU58lQNAaTweaioIhiPlwHG3rBDXPFxiKOyRUHgxPvhpXqId6SHI7wI930hv95Cw 7fPw== X-Forwarded-Encrypted: i=1; AJvYcCWquiBJiNS1LWwKWpr+rDnZutIaBYTDrVd9wzhglczRIIdo0U047H66dpBqTnHo6N2DDC3TjA==@lists.linux.dev X-Gm-Message-State: AOJu0YxRr8wFJMJJbbnBpbM7JpQWfyBo/VNxRAUnh9lPhR/aRpaBAut2 NFVjnF15I1awGabtVoaRZbnIQfJIvOReNF3BbhidT8M+iCFgSQJdJR3tO708epaS0Ii64Ti0FD/ tcGdDtw== X-Google-Smtp-Source: AGHT+IHwPMZGzfvW4HHKJ8l4pKBM2HZBGdDFPBOti30bJ3R5xYNqLd2qkSG+uTsnts5TsJg7XZvkaLmeguw= X-Received: from pjp15.prod.google.com ([2002:a17:90b:55cf:b0:2ea:5084:5297]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:3b8f:b0:2ff:6608:78cd with SMTP id 98e67ed59e1d1-30e830fbe31mr42654796a91.9.1747962065843; Thu, 22 May 2025 18:01:05 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 22 May 2025 17:59:38 -0700 In-Reply-To: <20250523010004.3240643-1-seanjc@google.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250523010004.3240643-1-seanjc@google.com> X-Mailer: git-send-email 2.49.0.1151.ga128411c76-goog Message-ID: <20250523010004.3240643-34-seanjc@google.com> Subject: [PATCH v2 33/59] KVM: x86: Skip IOMMU IRTE updates if there's no old or new vCPU being targeted From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Joerg Roedel , David Woodhouse , Lu Baolu Cc: 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="UTF-8" Don't "reconfigure" an IRTE into host controlled mode when it's already in the state, i.e. if KVM's GSI routing changes but the IRQ wasn't and still isn't being posted to a vCPU. Signed-off-by: Sean Christopherson --- arch/x86/kvm/irq.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c index 3a0f28e98429..67fc8901d15f 100644 --- a/arch/x86/kvm/irq.c +++ b/arch/x86/kvm/irq.c @@ -542,6 +542,9 @@ static int kvm_pi_update_irte(struct kvm_kernel_irqfd *irqfd, vcpu = NULL; } + if (!irqfd->irq_bypass_vcpu && !vcpu) + return 0; + r = kvm_x86_call(pi_update_irte)(irqfd, irqfd->kvm, host_irq, irqfd->gsi, vcpu, irq.vector); if (r) { -- 2.49.0.1151.ga128411c76-goog