From nobody Sun Nov 24 19:49:32 2024 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 B15711A7265; Sat, 2 Nov 2024 11:50:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730548225; cv=none; b=HigZXkEQot3nfE1Xxjuxu7+KPC5e4YVABnaX6h1XPZ7gToxQvgzBqOTOY3WRX18RR1jEP/g99xA1Mcuz0wutw62LnxeBDIPrr1c4peBH1miHFlIvo3yrqQZeBrhtyE7qifnwyJLicZBbgZcsusjlHHVqAjEr6n7l7++1KRar/5I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730548225; c=relaxed/simple; bh=ZnHMB0aoDdEWc3fRJbh0Z06LlnDSxNBh/Orez1chdYQ=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=M05PGPfSBETeE/yIL5UkOsdJ514fsRe8J6tx4PuruTJPkwm157/H9Pl704gMOEjRcW+ECHP7V3x/EIrwmJpqLpJaKN4schza2mQVzfRgwqIlkZvY9XllkCfYOVTByess8JVr1z4aa5wPtERbYVc8CRmv4/8p3Gr1HcCkY6KvQ7Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=ix+65i+V; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=jMS5nLLt; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ix+65i+V"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="jMS5nLLt" Date: Sat, 02 Nov 2024 11:50:21 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1730548222; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GMQ0YkpvfR6D2evYvnDh+c382Ix7mXdpn5H2Ej8Oqz4=; b=ix+65i+V1sAA+/kbbF2P/BWMKx2oCvT8wqQVq4UscX+hFIc4Fce7Grb0JpuC9QOKEWcn4Z /+HO5xOyZt94D3Tw4mgDqKDV5W12wWDWT9+b9F5Oea6wTRtqdfGVW3OnUJoo0H/g5CWBYq 3vLpwBkdvV4la5jU9CucfbBwASyTdtImslLakhrc4HnHDd+qYdcu6VtanqRY4IuX3+rDp5 o8b259nq/HLjUgwlsEzmWLs2QZtqKffCGjSim1968Jtlc0I9K0mKmpRR0+7vbmN2dWNd+s 9DQx0Nvd1gn5i9ogOQlCSrSHPAoQ9S7qe7dWsIj7tSKO0izFXSX6Zpd1Es9W4A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1730548222; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GMQ0YkpvfR6D2evYvnDh+c382Ix7mXdpn5H2Ej8Oqz4=; b=jMS5nLLtY2AEOJGYegLqavzOuMiM54SugUxVYJmsU7doVmIDYluT5zC7k+i0j0HoM+Ojlo DeXy1sVE6Kt6tOAg== From: tip-bot2 for Thomas =?utf-8?q?Wei=C3=9Fschuh?= Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: timers/vdso] x86/vdso: Allocate vvar page from C code Cc: thomas.weissschuh@linutronix.de, Thomas Gleixner , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20241010-vdso-generic-base-v1-14-b64f0842d512@linutronix.de> References: <20241010-vdso-generic-base-v1-14-b64f0842d512@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <173054822161.3137.5085699094287181442.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the timers/vdso branch of tip: Commit-ID: 7175126a6d45fea82cb25f4d35b35a0999fd6dae Gitweb: https://git.kernel.org/tip/7175126a6d45fea82cb25f4d35b35a099= 9fd6dae Author: Thomas Wei=C3=9Fschuh AuthorDate: Thu, 10 Oct 2024 09:01:16 +02:00 Committer: Thomas Gleixner CommitterDate: Sat, 02 Nov 2024 12:37:34 +01:00 x86/vdso: Allocate vvar page from C code Allocate the vvar page through the standard union vdso_data_store and remove the custom linker script logic. Signed-off-by: Thomas Wei=C3=9Fschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-14-b64f0842= d512@linutronix.de --- arch/x86/entry/vdso/vma.c | 16 +++++----------- arch/x86/include/asm/vdso/vsyscall.h | 6 ++++-- arch/x86/kernel/vmlinux.lds.S | 23 ----------------------- arch/x86/tools/relocs.c | 1 - 4 files changed, 9 insertions(+), 37 deletions(-) diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c index 8437906..5731dc3 100644 --- a/arch/x86/entry/vdso/vma.c +++ b/arch/x86/entry/vdso/vma.c @@ -20,25 +20,19 @@ #include #include #include -#include #include #include #include #include #include =20 -#undef _ASM_X86_VVAR_H -#define EMIT_VVAR(name, offset) \ - const size_t name ## _offset =3D offset; -#include - struct vdso_data *arch_get_vdso_data(void *vvar_page) { - return (struct vdso_data *)(vvar_page + _vdso_data_offset); + return (struct vdso_data *)vvar_page; } -#undef EMIT_VVAR =20 -DEFINE_VVAR(struct vdso_data, _vdso_data); +static union vdso_data_store vdso_data_store __page_aligned_data; +struct vdso_data *vdso_data =3D vdso_data_store.data; =20 unsigned int vclocks_used __read_mostly; =20 @@ -153,7 +147,7 @@ static vm_fault_t vvar_fault(const struct vm_special_ma= pping *sm, if (sym_offset =3D=3D image->sym_vvar_page) { struct page *timens_page =3D find_timens_vvar_page(vma); =20 - pfn =3D __pa_symbol(&__vvar_page) >> PAGE_SHIFT; + pfn =3D __pa_symbol(vdso_data) >> PAGE_SHIFT; =20 /* * If a task belongs to a time namespace then a namespace @@ -200,7 +194,7 @@ static vm_fault_t vvar_fault(const struct vm_special_ma= pping *sm, if (!timens_page) return VM_FAULT_SIGBUS; =20 - pfn =3D __pa_symbol(&__vvar_page) >> PAGE_SHIFT; + pfn =3D __pa_symbol(vdso_data) >> PAGE_SHIFT; return vmf_insert_pfn(vma, vmf->address, pfn); } =20 diff --git a/arch/x86/include/asm/vdso/vsyscall.h b/arch/x86/include/asm/vd= so/vsyscall.h index ce8d5c8..aac7d2b 100644 --- a/arch/x86/include/asm/vdso/vsyscall.h +++ b/arch/x86/include/asm/vdso/vsyscall.h @@ -8,20 +8,22 @@ #include #include =20 +extern struct vdso_data *vdso_data; + /* * Update the vDSO data page to keep in sync with kernel timekeeping. */ static __always_inline struct vdso_data *__x86_get_k_vdso_data(void) { - return _vdso_data; + return vdso_data; } #define __arch_get_k_vdso_data __x86_get_k_vdso_data =20 static __always_inline struct vdso_rng_data *__x86_get_k_vdso_rng_data(void) { - return (void *)&__vvar_page + __VDSO_RND_DATA_OFFSET; + return (void *)vdso_data + __VDSO_RND_DATA_OFFSET; } #define __arch_get_k_vdso_rng_data __x86_get_k_vdso_rng_data =20 diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index 6726be8..e7e1984 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -193,29 +193,6 @@ SECTIONS =20 ORC_UNWIND_TABLE =20 - . =3D ALIGN(PAGE_SIZE); - __vvar_page =3D .; - - .vvar : AT(ADDR(.vvar) - LOAD_OFFSET) { - /* work around gold bug 13023 */ - __vvar_beginning_hack =3D .; - - /* Place all vvars at the offsets in asm/vvar.h. */ -#define EMIT_VVAR(name, offset) \ - . =3D __vvar_beginning_hack + offset; \ - *(.vvar_ ## name) -#include -#undef EMIT_VVAR - - /* - * Pad the rest of the page with zeros. Otherwise the loader - * can leave garbage here. - */ - . =3D __vvar_beginning_hack + PAGE_SIZE; - } :data - - . =3D ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE); - /* Init code and data - will be freed after init */ . =3D ALIGN(PAGE_SIZE); .init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) { diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c index c101bed..6afe2e5 100644 --- a/arch/x86/tools/relocs.c +++ b/arch/x86/tools/relocs.c @@ -89,7 +89,6 @@ static const char * const sym_regex_kernel[S_NSYMTYPES] = =3D { "init_per_cpu__.*|" "__end_rodata_hpage_align|" #endif - "__vvar_page|" "_end)$" }; =20