From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793211209; b=1aT31w/K0IhRjN0EFurcsvontOSJAP6kFw+YNg4G3JP+3yz6DlGChlfo1vFXl/K8rwwp A3fnUU/EtuvL/rUnpdHp5CbbploM77FSPRAesUbWdFKyr4fRdtBqrm0HrxcXpyMTgSsff 8UBfGoZkvs4hyDJcqYdhUA/1uYvDGkKHjk+5vyVNpsP7dtC8x1i0r71zHMg6qHfCCeutm 2HhTTvbKATuZ00j4EdVdtPOQGU+4Dy+fHsEgXbMpjT6mWVux4swCgamcMEqtA5X8RIr5l T2cXCSdnvAWdtzeq/zbcT4Y6Arb4Z9mrEJpb2dwKk8qNMXi2Z48JrtOCSVnjpERgwJA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793211209; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=Q+jRH3x57p+rkcNIYpWLUxvFtXVtvmGrO1/Phg2WDmU=; b=0SAuCj/qR8cnvyyYrVugrbI01/j8GXrwFlwuhUfiAx9bgEmdnORoSO8N3aClmg1qfzH2 +uGtnHunuaOgLxRdkQ3W7mK36UCP60z5m+iZStKWMNju2u5fwHWBAAb+E1QYhAq4q5Gvv 5jKF2gysV9UEZi/01KSrEukHT0uZmZ9seXupbjBDwCQArHYKX9mGJe9LTTD0omCUG9OlL O6jyrkJJhSel0Yi+1Oc9xDVhAHlfFzvJEstkOSiCoBT+1UbCXBmQn2ObM1tXuEMrTau0o L50oa9mgC8o1AMOzkr6b5yk89oxtKdf8m+yjg7mcRal3LIa8PGKqJYohBBnl8oFgtBw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=KsnAOsVO; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B293C606A951; Wed, 28 Oct 2026 18:13:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=KsnAOsVO Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FA191F01825; Wed, 28 Oct 2026 18:13:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793211208; bh=Q+jRH3x57p+rkcNIYpWLUxvFtXVtvmGrO1/Phg2WDmU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=KsnAOsVOMWBJQcz5unFE0gXBXRQiszV0S9BXoqC55U2/AOvBWStDvNfcfHz+dA4v6 AgRX2S+rjdvSnFQw6MLhJL8vsFJN+BMJdNcoffPHKxnC398xkFMA29yYKRvOGXIBSo Vxy106NfB0Y60fL1/zrWwBC5hoWsr78wfWMAyaGg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mostafa Saleh , Sasha Levin Subject: [PATCH 5.15 297/571] KVM: arm64: Dont use the VMA to size stage-2 block mappings for VM_PFNMAP Date: Wed, 28 Oct 2026 17:57:24 +0100 Message-ID: <20261028170015.047191948@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170008.009143722@linuxfoundation.org> References: <20261028170008.009143722@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mostafa Saleh [ Upstream commit 71cc2c67fb8f8d5aa8154eb482e9846d2214f11b ] get_vma_page_shift() derives the stage-2 block size for VM_PFNMAP VMAs from the VMA layout alone, which does not necessarily match what stage-1 maps for that VMA. Upstream commit 71cc2c67fb8f ("KVM: arm64: Use stage-1 leaf size for VM_PFNMAP") drops that calculation and lets transparent_hugepage_adjust() derive the mapping size from the stage-1 leaf instead. The second part is not applicable here: in this kernel transparent_hugepage_adjust() takes a reference on the backing struct page, which is not safe for MMIO, and stage-1 has no huge PFNMAP before v6.12 anyway. Only drop the VMA-based calculation, so VM_PFNMAP VMAs are mapped at PAGE_SIZE. Fixes: 2aa53d68cee6 ("KVM: arm64: Try stage2 block mapping for host device MMIO") Cc: stable@vger.kernel.org Signed-off-by: Mostafa Saleh Signed-off-by: Sasha Levin --- arch/arm64/kvm/mmu.c | 25 ++----------------------- 1 file changed, 2 insertions(+), 23 deletions(-) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 7d04f96706447..c5697cbbfabea 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -904,32 +904,11 @@ transparent_hugepage_adjust(struct kvm *kvm, struct kvm_memory_slot *memslot, return PAGE_SIZE; } -static int get_vma_page_shift(struct vm_area_struct *vma, unsigned long hva) +static int get_vma_page_shift(struct vm_area_struct *vma) { - unsigned long pa; - if (is_vm_hugetlb_page(vma) && !(vma->vm_flags & VM_PFNMAP)) return huge_page_shift(hstate_vma(vma)); - if (!(vma->vm_flags & VM_PFNMAP)) - return PAGE_SHIFT; - - VM_BUG_ON(is_vm_hugetlb_page(vma)); - - pa = (vma->vm_pgoff << PAGE_SHIFT) + (hva - vma->vm_start); - -#ifndef __PAGETABLE_PMD_FOLDED - if ((hva & (PUD_SIZE - 1)) == (pa & (PUD_SIZE - 1)) && - ALIGN_DOWN(hva, PUD_SIZE) >= vma->vm_start && - ALIGN(hva, PUD_SIZE) <= vma->vm_end) - return PUD_SHIFT; -#endif - - if ((hva & (PMD_SIZE - 1)) == (pa & (PMD_SIZE - 1)) && - ALIGN_DOWN(hva, PMD_SIZE) >= vma->vm_start && - ALIGN(hva, PMD_SIZE) <= vma->vm_end) - return PMD_SHIFT; - return PAGE_SHIFT; } @@ -1038,7 +1017,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, force_pte = true; vma_shift = PAGE_SHIFT; } else { - vma_shift = get_vma_page_shift(vma, hva); + vma_shift = get_vma_page_shift(vma); } shared = (vma->vm_flags & VM_SHARED); -- 2.53.0