From nobody Sat Feb 7 04:47:30 2026 Received: from mail-dy1-f169.google.com (mail-dy1-f169.google.com [74.125.82.169]) (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 E13BB3806CC for ; Mon, 2 Feb 2026 17:20:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.169 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770052823; cv=none; b=LDxp8Uwf73KXd04a3qmmIgduWxehtZsPcxrUdKCdINYco2Y0/eKro7nvdixbOqaGFJPUAlHr3k8Z9ZtESaKnj+JjEuGD3iOxClLi9ifN5pvmVimWY4yqahXLsF1sSoOTwK+Q5B+2xnavafM/J28hyDKyVChqJaBAzN4Jf+mDfa0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770052823; c=relaxed/simple; bh=1A+7tULqyyuiHljT+c6eaLEjHCUXMB1XgPtJL7QmNVs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oPYfwGVxv7Cnmqt8rshSFxPdFVsP6CszhbykPkaK9exbM0k05KPgx13f/fYvcIkQCQoJPq7zQTanzLJFBUHGx7PQBiMuj62C0/jV2J1zn37t5Z/aLqdp140tIOAkKX+EMdUBGf7iyBVEHf+gTcXSw/efQZPgqcnxGZDeLYMYqc0= 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=HMiRyZEh; arc=none smtp.client-ip=74.125.82.169 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="HMiRyZEh" Received: by mail-dy1-f169.google.com with SMTP id 5a478bee46e88-2b81ebac5d6so397445eec.1 for ; Mon, 02 Feb 2026 09:20:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770052820; x=1770657620; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=L6Dakk1p+cxLUZDPwt425oyyrOrpg/tog8dKsiFMjKg=; b=HMiRyZEhJjDWqgGlEwTzXDOqg5hcjMGmuSNQJPy73vQqPuNtlNYEsBoNtUGRmNVD7I TLwbGwDgOQ/LOsIke2urPzTf6elAEAAQxU26LRlJ3WBJsuc3YQ8kxEeX7/1cVDLKDBXs +V/aumYUwe+Li47F/ISHQFMhOxBoDa98hmDNA/bZkE0qDSD+pUAOybgTRw7Gjx774IUl xn4avkDwyRA2oUnRe1ln7/oc4TJFrxXaa4XE91beft895xLgrW9r37KdSNqJo7mB2zSs AyxvavBEt0un3VZhSPh+8B25ags895aUT0pvBBeOknKbnQpY9q6G3cJOeaqZmRS47/2C Qh6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770052820; x=1770657620; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=L6Dakk1p+cxLUZDPwt425oyyrOrpg/tog8dKsiFMjKg=; b=UZEf6nw0qDIsrM8NzLjHMiIKW6RXzrC1LONbwXZuJn2VIAY826QnlFGfdgoRa1iyFH ItS5KJfPMUFvHOfVDEPmb7sUgMn7SBQxuuuVRBlIgX716beE8j4koyrserMFXxBQbbmU z3LffhmpNS8WzeLf3xEC21ol87fzoANvJClugv1rWyFqVnoPKTZSWLNP4DWSmvob5m2k AxlUyd20yB/bDFBEShJz64MbYnev6ZROZZ52aQmuLEIDJwT/kfiYThFcoC7V33I0WoaM QgQIcib2c8QbyW22+lUBO0DI1a5HdxLVzoRFTkW+Qlm9uTF7V7DounI8TN3B5qRDT6Hk NtDw== X-Gm-Message-State: AOJu0Yz+vL8t8RJe25oLYFWXvNM86G7Ti6+48yr9hYWXPOivD6hHxBaK YdYB0jOqpg91JVw1qIIWMcC16aIfEgwkjRdYKLUlX2/6/y01v1fFzwWdD8MW0A== X-Gm-Gg: AZuq6aKX+Qekgd9vsUhFY9qZ5uwldgobl3qb/myxryxo51I4AF3q5vFuqHkfR1r7Zj4 YtVFi9mbk7B83YfEtc1gWt7cD+1x8o+kNq1ZP/w3iBX+8A2oJ+OkISCymzHJOcuLvRtkHg85QDE nw2P+HlKllkQ8+11J01r1M4HAi/hrAQ1V5+80J7iGyKb6lxvs0/4bYKugWl40h229FeR5nZlLOa KEUVibxanxyyeOp+7EVc/z+RTtDHq/c5oEWTAdvAAYWvhfEy+ztekzrO3WtWi3QqXVw2YyRQvcM iABiXBcUQKAsrD0pXyzFZRlnmCTGeLSrPGNSDw+sxHWr1vvowejyuvAysm9nZneqecmbJ6OjsSS jECRAh3M8hYndau45QiG9J8qTxMRDPm55Bdjr38kF/1vcJm3zzuKSXiyMHfyO+aYV/i64LFQdvt sekDlpeUrsxzWOW93UYPqBDmx1Wbmnql8sXek9Bl+4Ldhz0TLv2uyOCs/l+KY= X-Received: by 2002:a05:693c:6094:b0:2b7:ee1e:75f4 with SMTP id 5a478bee46e88-2b7ee1e7aefmr2433754eec.42.1770052820338; Mon, 02 Feb 2026 09:20:20 -0800 (PST) Received: from fedora (104-57-70-139.lightspeed.sntcca.sbcglobal.net. [104.57.70.139]) by smtp.googlemail.com with ESMTPSA id 5a478bee46e88-2b7a1adef97sm20129902eec.29.2026.02.02.09.20.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Feb 2026 09:20:19 -0800 (PST) From: "Vishal Moola (Oracle)" To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, "Mike Rapoport (Microsoft)" Cc: akpm@linux-foundation.org, "Matthew Wilcox (Oracle)" , Dave Hansen , Andy Lutomirski , Peter Zijlstra , "Vishal Moola (Oracle)" Subject: [PATCH v3 1/3] x86/mm/pat: Convert pte code to use ptdescs Date: Mon, 2 Feb 2026 09:20:03 -0800 Message-ID: <20260202172005.683870-2-vishal.moola@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260202172005.683870-1-vishal.moola@gmail.com> References: <20260202172005.683870-1-vishal.moola@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In order to separately allocate ptdescs from pages, we need all allocation and free sites to use the appropriate functions. Convert these pte allocation/free sites to use ptdescs. Signed-off-by: Vishal Moola (Oracle) Acked-by: Mike Rapoport (Microsoft) --- arch/x86/mm/pat/set_memory.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 6c6eb486f7a6..f9f9d4ca8e71 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1408,7 +1408,7 @@ static bool try_to_free_pte_page(pte_t *pte) if (!pte_none(pte[i])) return false; =20 - free_page((unsigned long)pte); + pagetable_free(virt_to_ptdesc((void *)pte)); return true; } =20 @@ -1537,12 +1537,15 @@ static void unmap_pud_range(p4d_t *p4d, unsigned lo= ng start, unsigned long end) */ } =20 -static int alloc_pte_page(pmd_t *pmd) +static int alloc_pte_ptdesc(pmd_t *pmd) { - pte_t *pte =3D (pte_t *)get_zeroed_page(GFP_KERNEL); - if (!pte) + pte_t *pte; + struct ptdesc *ptdesc =3D pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0); + + if (!ptdesc) return -1; =20 + pte =3D (pte_t *) ptdesc_address(ptdesc); set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE)); return 0; } @@ -1600,7 +1603,7 @@ static long populate_pmd(struct cpa_data *cpa, */ pmd =3D pmd_offset(pud, start); if (pmd_none(*pmd)) - if (alloc_pte_page(pmd)) + if (alloc_pte_ptdesc(pmd)) return -1; =20 populate_pte(cpa, start, pre_end, cur_pages, pmd, pgprot); @@ -1641,7 +1644,7 @@ static long populate_pmd(struct cpa_data *cpa, if (start < end) { pmd =3D pmd_offset(pud, start); if (pmd_none(*pmd)) - if (alloc_pte_page(pmd)) + if (alloc_pte_ptdesc(pmd)) return -1; =20 populate_pte(cpa, start, end, num_pages - cur_pages, --=20 2.52.0 From nobody Sat Feb 7 04:47:30 2026 Received: from mail-dy1-f178.google.com (mail-dy1-f178.google.com [74.125.82.178]) (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 E999329ACDB for ; Mon, 2 Feb 2026 17:20:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.178 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770052826; cv=none; b=gHQAxfB34KyHenxJudu8tjnD2zR3w4miPar/su5g1jvD+BKmer4eH0ddLuB4GSm9bFV3RL2K52Y1wCb8N+JmM448cakBi2eUrg7somkHlesYlW9djMryEpz/V+flfxlQsz4wZseuLtrmEeg5uZyTgXwK7jNWVkQQLdQaw5PVnzw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770052826; c=relaxed/simple; bh=vWllybz7h3YZzb4GBg4RgrcaWeQLpDuF1jr/2fYUtJU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uH4nILVd2G0udXTVc/YCh9bCcnzai0Z7bqRce88o2qp1SYwhB388oal0HbuKT08KYZ9pY0uzbfHo1NGmIuHlCn8BVHd4uSKfcEOCqdDgRGwvwM9sdMbPTZcrLHw04w6qcvNPZj5dSUv2yP8vDLesi+aPTwPWJtA2lOK3zS+qweg= 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=lBw6Unxv; arc=none smtp.client-ip=74.125.82.178 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="lBw6Unxv" Received: by mail-dy1-f178.google.com with SMTP id 5a478bee46e88-2b740872a01so282670eec.1 for ; Mon, 02 Feb 2026 09:20:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770052823; x=1770657623; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=3sq16mep/iYQaFBvDSBoeA6lrsbFpK2J8G4JVLIYDXE=; b=lBw6UnxvTak8MPfwTLv/NlUjKlyfm25Vp2o/6OAWkgL9HBOuElUVQeuV7qzanzrjyh G0h8b1dxtkiBXEuavP0OioskZi6Juyrv1F+w93wBkZi/CiOvrRj6xB5g+SI2NRtA9Dc3 vzxRlRXxl6eW+WSPCPQjd+Jz1MTpD58LFDqyOjz6lx8AmA22URGJFUpxW3xYr/VMKVPA eK4W5UrBZ8VUODFVRxEvd0MmZ1r6thoY6oHUaZrjaCpC6F2jKS54+8k9A2/HC21iL3yp vcHXu1tCplTl+55ZdqD4zW4iLB38f0TcLFxieGbdOqXvcn118Iih5NrOBP9QYB/1op/2 f5ew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770052823; x=1770657623; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=3sq16mep/iYQaFBvDSBoeA6lrsbFpK2J8G4JVLIYDXE=; b=Oq9B627GH5kbcHzP3nU2F64506sXkiqBcIAOeDrpC3JHv1+Li9nmd4w0f7V19VTfWe 6EmSp0I3BIvepV6Uaj6/Katql14T2c2OnGU/Yxonz1yvG30Rrx+319O56dWk9XxSS0bS dCg+Jf9fhlGl5hAa31bpzD+piJ/gljuxGGUYpnw1R7zwrLpac75/QuPCf6zBB859UYt6 jDvyszOVuquzvJw9K5de0Y7KYdNg+MaKm+ED2gasX0Y63np+GG4+WAs6PFepYnIq3S4f iBb3vaIAu1TUz0D+cuessgVnb7nXnVC7QeIq8EKtePoUqSEzqOBzfBoBV+LXDSyRWYyW pLig== X-Gm-Message-State: AOJu0Yy9k4bM6jGLpK+CbrFqfLGm2zzYYiNMT1ofISlmkjIfzW2wtbPy 8RQINQeE/ZK0BwqaFszKR3InLCb/OHgSYcNOACYe57RmsRUd3rxzztifAK0pTg== X-Gm-Gg: AZuq6aKmX4mgdl4TcYPOGi19fhkYKLER6saoxErn1KUlz483+ZoGgx28lB1hScKzmzA LRoUhnwMsA3SLqz/l4noJdyzmqtYIw6/WiyO67RXq19ZaX3CfJL6bSHigtKdYgAGnpTqDLmL1KJ G0gg9Ln513XPqrfLonNEQhx6ZgyrG6fx7uxQGh3MuAP5JoEYbXjgqvXAscn2rTJUwwN4AiGecjU f2cE2fZTX5HrLDy/qx2AfG2vmiX6dCVC7XO00gIcael8Z0Li3Eyh4R1AOs4ORx6cGdMM49NUVGJ qdJvUrwYPIuKJN5atQ2IKAlwtVvcjRjJjiVvQM4j1YCsxdA2rsHHXloYDd8LxcppS88PuWWaUM7 fMNuwJ5Bo7q9I3eZHC3GvOPV+J68m05gWozoDCzFBu0BuyTZd6smFZbGUJmjrgBBK+0mzN9IdrV QeD2shzBADV2jy7LXxyefNQY6wjjvTRjiePVpzcxK8irS+Dm1L9jeXz86KLKQ= X-Received: by 2002:a05:7301:1f0b:b0:2b7:17c4:be22 with SMTP id 5a478bee46e88-2b7c8632fd9mr5191644eec.1.1770052821832; Mon, 02 Feb 2026 09:20:21 -0800 (PST) Received: from fedora (104-57-70-139.lightspeed.sntcca.sbcglobal.net. [104.57.70.139]) by smtp.googlemail.com with ESMTPSA id 5a478bee46e88-2b7a1adef97sm20129902eec.29.2026.02.02.09.20.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Feb 2026 09:20:21 -0800 (PST) From: "Vishal Moola (Oracle)" To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, "Mike Rapoport (Microsoft)" Cc: akpm@linux-foundation.org, "Matthew Wilcox (Oracle)" , Dave Hansen , Andy Lutomirski , Peter Zijlstra , "Vishal Moola (Oracle)" Subject: [PATCH v3 2/3] x86/mm/pat: Convert pmd code to use ptdescs Date: Mon, 2 Feb 2026 09:20:04 -0800 Message-ID: <20260202172005.683870-3-vishal.moola@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260202172005.683870-1-vishal.moola@gmail.com> References: <20260202172005.683870-1-vishal.moola@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In order to separately allocate ptdescs from pages, we need all allocation and free sites to use the appropriate functions. Convert these pmd allocation/free sites to use ptdescs. populate_pgd() also allocates pagetables that may later be freed by try_to_free_pmd_page(), so allocate ptdescs there as well. Signed-off-by: Vishal Moola (Oracle) Acked-by: Mike Rapoport (Microsoft) --- arch/x86/mm/pat/set_memory.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index f9f9d4ca8e71..9f531c87531b 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1420,7 +1420,7 @@ static bool try_to_free_pmd_page(pmd_t *pmd) if (!pmd_none(pmd[i])) return false; =20 - free_page((unsigned long)pmd); + pagetable_free(virt_to_ptdesc((void *)pmd)); return true; } =20 @@ -1550,12 +1550,15 @@ static int alloc_pte_ptdesc(pmd_t *pmd) return 0; } =20 -static int alloc_pmd_page(pud_t *pud) +static int alloc_pmd_ptdesc(pud_t *pud) { - pmd_t *pmd =3D (pmd_t *)get_zeroed_page(GFP_KERNEL); - if (!pmd) + pmd_t *pmd; + struct ptdesc *ptdesc =3D pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0); + + if (!ptdesc) return -1; =20 + pmd =3D (pmd_t *) ptdesc_address(ptdesc); set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); return 0; } @@ -1625,7 +1628,7 @@ static long populate_pmd(struct cpa_data *cpa, * We cannot use a 1G page so allocate a PMD page if needed. */ if (pud_none(*pud)) - if (alloc_pmd_page(pud)) + if (alloc_pmd_ptdesc(pud)) return -1; =20 pmd =3D pmd_offset(pud, start); @@ -1681,7 +1684,7 @@ static int populate_pud(struct cpa_data *cpa, unsigne= d long start, p4d_t *p4d, * Need a PMD page? */ if (pud_none(*pud)) - if (alloc_pmd_page(pud)) + if (alloc_pmd_ptdesc(pud)) return -1; =20 cur_pages =3D populate_pmd(cpa, start, pre_end, cur_pages, @@ -1718,7 +1721,7 @@ static int populate_pud(struct cpa_data *cpa, unsigne= d long start, p4d_t *p4d, =20 pud =3D pud_offset(p4d, start); if (pud_none(*pud)) - if (alloc_pmd_page(pud)) + if (alloc_pmd_ptdesc(pud)) return -1; =20 tmp =3D populate_pmd(cpa, start, end, cpa->numpages - cur_pages, @@ -1742,14 +1745,16 @@ static int populate_pgd(struct cpa_data *cpa, unsig= ned long addr) p4d_t *p4d; pgd_t *pgd_entry; long ret; + struct ptdesc *ptdesc; =20 pgd_entry =3D cpa->pgd + pgd_index(addr); =20 if (pgd_none(*pgd_entry)) { - p4d =3D (p4d_t *)get_zeroed_page(GFP_KERNEL); - if (!p4d) + ptdesc =3D pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0); + if (!ptdesc) return -1; =20 + p4d =3D (p4d_t *) ptdesc_address(ptdesc); set_pgd(pgd_entry, __pgd(__pa(p4d) | _KERNPG_TABLE)); } =20 @@ -1758,10 +1763,11 @@ static int populate_pgd(struct cpa_data *cpa, unsig= ned long addr) */ p4d =3D p4d_offset(pgd_entry, addr); if (p4d_none(*p4d)) { - pud =3D (pud_t *)get_zeroed_page(GFP_KERNEL); - if (!pud) + ptdesc =3D pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0); + if (!ptdesc) return -1; =20 + pud =3D (pud_t *) ptdesc_address(ptdesc); set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE)); } =20 --=20 2.52.0 From nobody Sat Feb 7 04:47:30 2026 Received: from mail-dy1-f176.google.com (mail-dy1-f176.google.com [74.125.82.176]) (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 C566738735A for ; Mon, 2 Feb 2026 17:20:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770052826; cv=none; b=cpXIBfs9GVjQ/Wing3HXSVUERT/bpc2mSq1lBv56cj4g0QGtU//bCp5MGpVK9EHCYvA4f3/jHSC4onMe+kwx/SI+OgdigA1xudNcr2aOZLMHNQGjr8c3grGpyjdMvRA/u/vIWqAtko7wQNPMsFBNEKGuFWHOh3pkyfWomUf50Sg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770052826; c=relaxed/simple; bh=yj6D6KhYgQFDZBA/1QdeOoy/5QkLW8fQ8DGw95rLnvk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Y53Bl1v5i40/X71rLM4y2Al5cK2sBWm6b1DMXzTOQLqC/pF5Yp82rVXb0jWIbWmQrVQkBl7yfEL6VnBxEbxPUqCJiNE3NwPhNffIXR5/qXh6ZtinQU8Js7GFT+5j+HAGTAtbFtYW98MpT8bOLJBW8V/2OQtBwg/mhq2kssehScw= 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=ibU8UGyy; arc=none smtp.client-ip=74.125.82.176 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="ibU8UGyy" Received: by mail-dy1-f176.google.com with SMTP id 5a478bee46e88-2b720bb90d0so4573413eec.0 for ; Mon, 02 Feb 2026 09:20:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770052823; x=1770657623; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=utHr5Hk4Pmw7AlX0/QS7v9ZBDUDXlcYDE/CS8IUJBFk=; b=ibU8UGyy8q8Cx4q9efTdbkNNMPoF9Pv5Pe13JhmrYavaRa+ZHtr4nqyoyLWKAD+Qsq BZ0LLQeDiVdB3jLHsDK70HtbXS7A/RJRxXYTIQI4a+o11BFaPv7lWQNJWBWwQYhkadqt FY/wKEDAz4SAPzmPqzaEcaETQkaNF6FXQKCMPJQrztoQpzQ1Y8RlJMuux7bW7AuGOW6g cHV5x0vUNm+GPhDCPuTd9PYmkIqgtIkO3WaZbR8MJd5HueH3se2MPxT4CgzrTU2lS5fY uA/qEhmP3v1lxNt7AxgPy/8Rtwf2MQPTSqQiXzs5pV5OWLZpA5AVM4MmsQl2SxQ/cRh1 TWig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770052823; x=1770657623; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=utHr5Hk4Pmw7AlX0/QS7v9ZBDUDXlcYDE/CS8IUJBFk=; b=X3cLXErkJKGec7YuoeknamtpL4GOx6kixTF5BUDD1SJZtUU/mHna4UbljLClZAfHrb 4lJilS+UQ02KqOoUO5k/84n84FriIfUTQto22gLVFaCwjjB8YSH28xjc+4QOBcttX2gL A3x1mYvlnLHduUAOSz0Oh75m11qhSSyJhL5Y1cEnNluBgmEiCHuGWxj8HHSE22kzfAYL 0mLvU8zsugy70+iy6hpg/8XL8971bEtxX05b9tA5JIGncRcmt9FZTERbZDOeyWqPPoNI BoBsUjsFHAW1h371ToZp+my3gI+NoqxxSD7fCiINs2WeDRz8tAWBB5KFpvRla7nNN8hx 1Prg== X-Gm-Message-State: AOJu0YwErpvFLsCOPCL3nRaUa1IBIrw2nNtvFf1SY3C72+2MLWrCoXwj hTvbO9bt45JUuY3kR4vwMry2JtBcuWpJ2Y9NWkLJ3IXnoCGIzctR00Zxnb/42A== X-Gm-Gg: AZuq6aIiw192MDwkz0Z1eXsfBOqfEmrn2aINwduQkruOA1pnrSAoGhwsfRfrz0iFuWt qnqSK1kx/VU+oWgGbL0yYJ7EHvWpq73lPVDVsVcADBYiRLv0r3XLfvtjhBqZ7R10UumlfhC6KrL wR3aQpbMVbONgNEVROxSPq6g2WFTgW2ejFMUTvnK0ofixm674jUqukS9GvDqGwaINp2qp7qan5W rSIVVSYpYs7ZXrfhrPQn3VxTXYTo+7GUhmuEdKSaDUNiVn7/Y9Rb8vlSKagPxdD7jGJqJrCWnXe OxCtfnoj8Jiu5QXuhX1SrzExgLoOBOvRtIpWNioUS9m8Ic7tvcR/LKu+JzUxPUyT4gxjZHTdQGJ d0QLn1VLqzWtE2ol16ZYK6YK7iw/SqM1TMr1Upn4YD+eS4a/y90wvR3zr2tcGOt8aCTAyw1t1ht 95zXrpkc+VhsMz3pwLoZTTjDd1ygoMZ48OeqwPD40q3C6siEWiwhjoMGigVIY= X-Received: by 2002:a05:7300:d51b:b0:2a4:3593:c7ca with SMTP id 5a478bee46e88-2b7c864e335mr4588938eec.10.1770052823241; Mon, 02 Feb 2026 09:20:23 -0800 (PST) Received: from fedora (104-57-70-139.lightspeed.sntcca.sbcglobal.net. [104.57.70.139]) by smtp.googlemail.com with ESMTPSA id 5a478bee46e88-2b7a1adef97sm20129902eec.29.2026.02.02.09.20.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Feb 2026 09:20:22 -0800 (PST) From: "Vishal Moola (Oracle)" To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, "Mike Rapoport (Microsoft)" Cc: akpm@linux-foundation.org, "Matthew Wilcox (Oracle)" , Dave Hansen , Andy Lutomirski , Peter Zijlstra , "Vishal Moola (Oracle)" Subject: [PATCH v3 3/3] x86/mm/pat: Convert split_large_page() to use ptdescs Date: Mon, 2 Feb 2026 09:20:05 -0800 Message-ID: <20260202172005.683870-4-vishal.moola@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260202172005.683870-1-vishal.moola@gmail.com> References: <20260202172005.683870-1-vishal.moola@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In order to separately allocate ptdescs from pages, we need all allocation and free sites to use the appropriate functions. split_large_page() allocates a page to be used as a page table. This should be allocating a ptdesc, so convert it. Signed-off-by: Vishal Moola (Oracle) Acked-by: Mike Rapoport (Microsoft) --- arch/x86/mm/pat/set_memory.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 9f531c87531b..52226679d079 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1119,9 +1119,10 @@ static void split_set_pte(struct cpa_data *cpa, pte_= t *pte, unsigned long pfn, =20 static int __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long addres= s, - struct page *base) + struct ptdesc *ptdesc) { unsigned long lpaddr, lpinc, ref_pfn, pfn, pfninc =3D 1; + struct page *base =3D ptdesc_page(ptdesc); pte_t *pbase =3D (pte_t *)page_address(base); unsigned int i, level; pgprot_t ref_prot; @@ -1226,18 +1227,18 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpt= e, unsigned long address, static int split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address) { - struct page *base; + struct ptdesc *ptdesc; =20 if (!debug_pagealloc_enabled()) spin_unlock(&cpa_lock); - base =3D alloc_pages(GFP_KERNEL, 0); + ptdesc =3D pagetable_alloc(GFP_KERNEL, 0); if (!debug_pagealloc_enabled()) spin_lock(&cpa_lock); - if (!base) + if (!ptdesc) return -ENOMEM; =20 - if (__split_large_page(cpa, kpte, address, base)) - __free_page(base); + if (__split_large_page(cpa, kpte, address, ptdesc)) + pagetable_free(ptdesc); =20 return 0; } --=20 2.52.0