From nobody Sun Dec 14 12:13:35 2025 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 B3CE12882B0 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=1747962068; cv=none; b=Ek1V9ABKbeTm+M2g1YxkSamCD0MkSzmA58POXwaI7Dxc91zJ4Dpbnx8twgEL5Oq3rRlBFT1ENj0HSeD0uur0xVuqL21hTr+ipZz6+moTDJ+U4GgIeH/eFWSuw0bk1jMqkmrg31gZ7Ek4Z83sK3jXuaUn++sbUXw9ZOJC1mqHqtU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747962068; c=relaxed/simple; bh=D8FN8kkLx7L8tVrUTR+61zNHHfC5qjIkeg2WDBKUnVA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=i5ljl89N1mgBsbUGmfPFgBbOsP1FeL9F1xbp8h0UVWzCOT3dFBrnp9OyPKMwXC4oBb08rgxfqYYMQwe5GlTKY6pYEIm1KqfdU8Opt5AWhXlsYWhL7uOtuwbizYEnyw1EbHQWxlfEmRXo0WknSqa/VdUJMNiwDk9cl19o/pUFjU4= 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=vabktCzN; 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="vabktCzN" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-30ed6bd1b4cso7454636a91.0 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=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=a8iEK4WECydE0ey1yGfRxrlymXScvl+S1HRsDMKm8xs=; b=vabktCzN5A6ODhh1oq1YbFw6Gz4vl3FRUoeLffbuMUUFEpeBenrJWDoKpea5npxFxN wsdxAfPTKwHTMs7xrxMlnhCzSG4Nb/upBYH+U6Cd352f0jrm3Xd/mTzi/ez7oTW0U7ZU ViMxN4c6+2RJSAi98MKDdb4lgXUV/HH3vQzOdP7iKM3706roULR4Rm+fUkxM2r4hnLKH yQJs5gboYmUZDTP9FZCxVwhZ5ZtLSYzJ3gNZUXbdKE+IvZEWmSafoMtgkfcQMzi0fBZY ZNoVMgcTn2jlCFO1ORgqhEijF0aSbKIvwCxajLZBFWFMqq4dLZ6haHyPvhjv/FY81IB1 rZcA== 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=rH1PxgQuY6ub5OQza9kqO7Cndufd2Jc4wijuGQ4gHSPQI33JL7CZSSRDuOK3ygOzHk eq/iEF0xUXzOTe0dlVx+ul7gyYbsn0UObU3nhG/pFZ73tkjWXZps02tFkZCHPwM+4PAK DtroxKkgCMSU5c0paN1X3bqTjMknqoVsjfD9xnVhFbYDWyoI03+qJT6PuBYdpurAHbph 0lUl4VGyygiEnnySLPSkLOFLqzB3690wYCsZwfSgCX881O30suDbdanMIc9HDmQ3sFB5 1PJlVI89XcYrWiOHkhEX1ww3QPRerMPEUJVolIxA4+1VDaxGWel8NtYzx4ZyyuyE5HWs Oumg== X-Forwarded-Encrypted: i=1; AJvYcCXlzHZJ3KCJ8XOaIB8QMR/feKdVNQFEfbh8kOavwiIzWw/czCysGHRDyBRkn6N6R37AIh4333pw2kvFBVQ=@vger.kernel.org X-Gm-Message-State: AOJu0YyLrYGNq1iqA3VPsOqWMjpwDroCKHPR/JL7qtslq4NXYPu49Xus Zw/NcdGvOkHPawnn2/qBpWPxCDnj8ROhov/VrRrKgeP4iGMExDec/1YqoNnpH5m25Uq8XS+Ud6U 7xOT1ag== 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: linux-kernel@vger.kernel.org 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-Transfer-Encoding: quoted-printable 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 =3D NULL; } =20 + if (!irqfd->irq_bypass_vcpu && !vcpu) + return 0; + r =3D kvm_x86_call(pi_update_irte)(irqfd, irqfd->kvm, host_irq, irqfd->gs= i, vcpu, irq.vector); if (r) { --=20 2.49.0.1151.ga128411c76-goog