From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (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 B0DDC3DC4D3 for ; Fri, 27 Mar 2026 09:50:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774605020; cv=none; b=BCGIquSJlJoiTGTl59GKXpKDfdKNIqlsOPetHNLrk55y5ZmRKiRjgsNHdgx4SeGcU+Lgg3eNh5cKofA5zymG0EMrEZb7SBEIz/4J8xM1JhbNRy2XKA5gbWm2H6I92rUHqZkqTA7sFLKUKzsvzSGBROpnSf2x1GEjkV00+xrFCbs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774605020; c=relaxed/simple; bh=1aRHN1HrhugAbrsj57xMZIQw+SuHFxSkMmOmPZurSyI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=nR4/mqU8OEfiaZlhKBIfI8oQ5zKiFV1T39W87U6LpbJ4+NdAvzQEoIQb4XzNJy1ODXSrQi/yewhA2N/5wok9gW5k17L3JjFGng98YYxvGDxj+xlvt3Bh2YhDktgx78lDFWpKLtVartDb67EdSy4VK81Z1rYT3WiuoGgkePdzJZw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=rBkVl5FX; arc=none smtp.client-ip=209.85.128.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="rBkVl5FX" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-486fb14227cso23505915e9.3 for ; Fri, 27 Mar 2026 02:50:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774605017; x=1775209817; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=0zqN6vtlGEDX03lb/OTEIHW6JMIqpybLFJy8KDMEuPE=; b=rBkVl5FXUkzDM6U3qEewoiOjpg6Lm9F/S4Iz+cMynolOcfIDlBub4WMKczr1mO0NGe nc9964HAZvmkuGwAdpL5yBkzRsVN0+gFErTIpdS19YO0uHrHB0WdAsLl2zBiYIuHq/t6 6PXGjkfF7f0GY5l0aWFwsDIDWHXJX9sd115xhXVgBimvLMBEqPSWg8dGgDWPr2lQzwnr Qc5wAUSRHVt9jlVlEX6iEj1pO9G8+tjILCO4DMpr9jZ5plJf26ntBfn4pz+i8YbJ4oAr EPCkLoQMHGw8iJ44q3S1JHmVgtw6ArX/UcHbmrrf0AYm+CnFtvaS9YqKdQSPEx9Lec9o pxRQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774605017; x=1775209817; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=0zqN6vtlGEDX03lb/OTEIHW6JMIqpybLFJy8KDMEuPE=; b=Cw3w+XIvTSPYcYJQEQ/tZNdO4E9KHYfXcTdovYaC41QZXwUNwRSYSDw2lfGOa2SrnH E82EYom4kPvu5OUa8+vCKX5KKPQYzE9ewqt1VvJ2b2LT1T7cSkj+QGZM8jx4BuqVzObV VJrW3Zv+jKdWDavQPawwY4dQv/0ATxIjszrTklp6xQmp0GonwC1oO9amiVfkcALgoEax REAnq4GX1a4oxkPTLncYY+Om7uIMSETfLs/ZCzfpktPe5lLOn6On9F/QAVMXCVWo7e2k xOAtBybUfAgGQSdxb6/FKSlOTO1uwEcaeYdOj+SVgYQDhVtGPe4fCcC9bPSgDG2W3LMP rNzw== X-Gm-Message-State: AOJu0YzUORyRT70F3SdFLG4ioEYSWZcgtGgfcTswAvGTa0lT2cDNrWOg gtj1TIXONHH6VGgikSQ7Tp+reCCudar45fgjLDtpRr6f4N13uoXDwlRoGEOaWq/QBpE= X-Gm-Gg: ATEYQzzmo6uZAfpzLEvFpW/CTYjjovlGA6vmzce8WV2h+35nfWSs3e4YYTXPGDDqsqg JSDtXXSoudco2pXX7StfTqOYLpr4WOGjK8PamyBa5E4VJ4hLda82vaH82/+F1oY/w/9/pq+EdlJ FfT5tI03HtXLCcwojgSk4+3Fvlz4PGRe7R1tnxDMfeWttzpsNmHRAlJoPBrvymcfrCV7mEjvIDc zfK/cao9faXvNwwalLVSKoWB5JuTwluq6KqOslkHbD74bfYmY9pU7zJhmFaqxCT0cxBrGfAuneX LDtP2BaQLWI3H/EMxvtf/pWE5vIUysp/Xbeu//ZrEHY/+g5G7GID8qZSFM7KoU3lnLo4mhMFJsq 2jFKhfoMiKfY9AkjTAJ1fz4fmqiyvtwt+JszqxLY8CKlRHxst7/G0qiha4QZGPdGE34WOJqKHXe +KrhfPhDot/DL20cO5MepFmey6GXBcN6E9rIyMuKdQGTA0XcUqjMw47/oK18w1v+VsvEadQfg6e bf+8N9ncqzMU0DoJ39QqrK+2qKIbyqkDP2SC5w8SqQW5J0= X-Received: by 2002:a05:600c:45c4:b0:486:fe45:483 with SMTP id 5b1f17b1804b1-48727efbed2mr30344245e9.22.1774605016643; Fri, 27 Mar 2026 02:50:16 -0700 (PDT) Received: from Techashi.lan ([197.185.139.66]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4872712b3d3sm13116965e9.20.2026.03.27.02.50.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Mar 2026 02:50:16 -0700 (PDT) From: Chrinovic M To: kvm@vger.kernel.org Cc: pbonzini@redhat.com, linux-kernel@vger.kernel.org, Chrinovic M Subject: [PATCH] KVM: Document next_segment() behavior Date: Fri, 27 Mar 2026 11:50:00 +0200 Message-Id: <20260327095000.134105-1-chrinovicmu@gmail.com> X-Mailer: git-send-email 2.39.5 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a brief comment describing how next_segment() computes the number of bytes available in the current page when handling guest memory accesses. No functional change. Signed-off-by: Chrinovic M --- virt/kvm/kvm_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 9093251beb39..03ddfafe005c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3176,6 +3176,7 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map) } EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_vcpu_unmap); +/* Compute bytes available in current page for the guest memory op */ static int next_segment(unsigned long len, int offset) { if (len > PAGE_SIZE - offset) -- 2.39.5