From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AAFF51F8907; Tue, 3 Dec 2024 15:34:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733240073; cv=none; b=ZYW7FH4s/8zQ3hos1AWa/Rb4ZGY02yPA9FVIs38QZqnMLKyHGs/nlS4M0jUGKyxTsBhUUV/wv5eS0QRX7RbxaTgj5NwXnuK1fInErr+hzbT4A6Vuu7ZmJwTtYjaswXlfkYIdOKRDPc7AvPl0eXsP+ZSOF2qO74scmbbguxaJ88Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733240073; c=relaxed/simple; bh=zhoKENNa80HehLkrK7GzHotJAW6fpZlWGL1DpoMFcVw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iQdFmUv/X92zNQ4T1M31/KN6JHKZzgmQQWmaCEnfT3AxKUKeG0Uq5fmRF8BZbfv+LL1mY28MClTukk4++hCwsoHWXfdYrKv7t1ilvA0GFm+huygtUKTBayfCFZTnAsj6xFpWdmom0PHQ72hAzKTo1fUwsBnpU9Un99Ip0B7Qr84= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=YdfRE8aO; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="YdfRE8aO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 314DCC4CECF; Tue, 3 Dec 2024 15:34:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733240073; bh=zhoKENNa80HehLkrK7GzHotJAW6fpZlWGL1DpoMFcVw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YdfRE8aOjlsJGN4Zj78W+dgP/kSl+ClC7to15dCcHHW7EMS7aHt3dFB00B5B1YDzn Jz4OB9t2yjQKOUO5Woqv5teIYIKsPgZbc8vbv2iGdi+IMw6IKdy6Dw6NqUEFufA/Qg a0KveJnFB/6Z3OSj3vsfIAbXdFNHJb7V+1PRvm7g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Daniel Borkmann , Alexander Gordeev , Heiko Carstens , Sasha Levin Subject: [PATCH 6.12 014/826] s390/pageattr: Implement missing kernel_page_present() Date: Tue, 3 Dec 2024 15:35:41 +0100 Message-ID: <20241203144744.011534438@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241203144743.428732212@linuxfoundation.org> References: <20241203144743.428732212@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Heiko Carstens [ Upstream commit 2835f8bf5530750c3381166005934f996a83ad05 ] kernel_page_present() was intentionally not implemented when adding ARCH_HAS_SET_DIRECT_MAP support, since it was only used for suspend/resume which is not supported anymore on s390. A new bpf use case led to a compile error specific to s390. Even though this specific use case went away implement kernel_page_present(), so that the API is complete and potential future users won't run into this problem. Reported-by: Daniel Borkmann Closes: https://lore.kernel.org/all/045de961-ac69-40cc-b141-ab70ec9377ec@iogearbox.net Fixes: 0490d6d7ba0a ("s390/mm: enable ARCH_HAS_SET_DIRECT_MAP") Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin --- arch/s390/include/asm/set_memory.h | 1 + arch/s390/mm/pageattr.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/arch/s390/include/asm/set_memory.h b/arch/s390/include/asm/set_memory.h index 06fbabe2f66c9..cb4cc0f59012f 100644 --- a/arch/s390/include/asm/set_memory.h +++ b/arch/s390/include/asm/set_memory.h @@ -62,5 +62,6 @@ __SET_MEMORY_FUNC(set_memory_4k, SET_MEMORY_4K) int set_direct_map_invalid_noflush(struct page *page); int set_direct_map_default_noflush(struct page *page); +bool kernel_page_present(struct page *page); #endif diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c index 5f805ad42d4c3..aec9eb16b6f7b 100644 --- a/arch/s390/mm/pageattr.c +++ b/arch/s390/mm/pageattr.c @@ -406,6 +406,21 @@ int set_direct_map_default_noflush(struct page *page) return __set_memory((unsigned long)page_to_virt(page), 1, SET_MEMORY_DEF); } +bool kernel_page_present(struct page *page) +{ + unsigned long addr; + unsigned int cc; + + addr = (unsigned long)page_address(page); + asm volatile( + " lra %[addr],0(%[addr])\n" + " ipm %[cc]\n" + : [cc] "=d" (cc), [addr] "+a" (addr) + : + : "cc"); + return (cc >> 28) == 0; +} + #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE) static void ipte_range(pte_t *pte, unsigned long address, int nr) -- 2.43.0