From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) (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 23744230D1E for ; Fri, 4 Apr 2025 19:40:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743795657; cv=none; b=kf6aTq1exjzlO7ESebV0miiyycUi7+VvRWWv7E5aLCMyH1QrP7nrt126quIeJUUpbHU9hLD/golgg1T2PRbeAD73bq3rjv4OE8nmR8OfcR1/0617Bo8jh54bl1l47FpfnAOMr4AiuVbVd+er1wW4/rHHWtsr2Ktda6/X+CQnSGE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743795657; c=relaxed/simple; bh=rAx4qAmD55M9tfIGXl5YoCVA83RQWFiazrLX3izC4S0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Wtw/InzoAT0wZDmeS7S0GdOPXnqEKYynbWMMp6VC1aFoOif3QHcvL0HpU+OS3Y4k23sD3brzrERBcrQMTUnThoLG/ogYtkjJokHHUJMfEbEqg9phWlSmoZHR4a9Ch1T/1b5ATpOr3vscML1Zehr5fDbYw0wvFWqiFxIBvucSuVs= 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=aURX6CxW; arc=none smtp.client-ip=209.85.215.201 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="aURX6CxW" Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-af98c8021b5so2468764a12.2 for ; Fri, 04 Apr 2025 12:40:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1743795655; x=1744400455; 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=bZC+Ik33WL0W2RRbulovk+dibdQdMDMKKv8TRtkvhyw=; b=aURX6CxW0RW3hjpuEFh6zaLu/sYJ67tF8V1jD/rlhqHaOyYEn2jMJaPITeb/MV8H9l 4HcWlZ04h+sc4htL3CEk642BS+DGryp2Ca+oplMOlaiDTFhFudKvpEgcp+GTfo08rIj0 29bJ0yJfaEzlAka3972zWLrds1gG8NooRYltY4qB+VAB5BpgPCDcf7RXNOEL2HMIKo0O iAa0z+Mz9J8gbnaHV5Hv1m17QMS8j4JNWf1pWMpP0FFH9sRhl5CPuJmZ2kXk5hcQe4Lb whYQRBTJzZAk77lgysr6+P1bEmAm93jr4nvCfZN/v0qY7SKUB0EbQ3E4IQE+lAwQPl78 4axg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743795655; x=1744400455; 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=bZC+Ik33WL0W2RRbulovk+dibdQdMDMKKv8TRtkvhyw=; b=JvjkTbK6j0G6jEVkAbIPuvjE34jFW+3YOkEOVYbEnB6Qx4bVEPhFKiwVjtvxIQe57L 94wR+zS2iqBVX8iGGYnFIawD9UV3N4qb55T4tmRSeCSEKcCHzEdy9+pKAyXN84HuEtaX c5ERJPLOF/ZEXhbNPBDVbE168Sj4BgPwdURNzKWZK/H6hPH/OfefJuxhq+pcf1wbrLQy BEom+krggs8Hn+fnphafjuxUsiQXPQ8x8CvNNL99iJ5uFhf5DsNzwOWr0VgDrt5Ycru+ DTfqLYCeG+Gz/CUSao3KvZT4m2sqM4m4m15yFfSJvBkrfMJ+ejqTYYhKIcF5T75xemSp ysYA== X-Forwarded-Encrypted: i=1; AJvYcCXJHFmWaNVG8vt3bq7kW/5J7KVQan2cjVXIM+HPn18jFaClPpK9edJkChiAJpSJIKqLykffcg==@lists.linux.dev X-Gm-Message-State: AOJu0YwDx6sioqoREoqbrHpTeijczVMBeFEP6EjUALCaB8y1ei918jKo 3k0kyt+LT0jFLNejuw0xTQidyl8BG9pWveH1Lm6asM2eQAA2accbES2lu1ovprRK313nVPzfMDU NHA== X-Google-Smtp-Source: AGHT+IFQWL9LigLNP0a/K8uREP9gQEOYzG81Hr4sts6sxEYIr+yeo+mdbybE7LvF1mbotb2pbsREFg7UZT0= X-Received: from pgc1.prod.google.com ([2002:a05:6a02:2f81:b0:af9:553c:ea73]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:c78e:b0:1f5:7007:9ea5 with SMTP id adf61e73a8af0-20113c0964bmr1123119637.2.1743795655565; Fri, 04 Apr 2025 12:40:55 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 4 Apr 2025 12:38:55 -0700 In-Reply-To: <20250404193923.1413163-1-seanjc@google.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250404193923.1413163-1-seanjc@google.com> X-Mailer: git-send-email 2.49.0.504.g3bcea36a83-goog Message-ID: <20250404193923.1413163-41-seanjc@google.com> Subject: [PATCH 40/67] 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, Maxim Levitsky , Joao Martins , 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/x86.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 0d9bd8535f61..8325a908fa25 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -13602,6 +13602,9 @@ 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, new, vcpu, irq.vector); if (r) { -- 2.49.0.504.g3bcea36a83-goog