Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751250Ab2HaFSw (ORCPT ); Fri, 31 Aug 2012 01:18:52 -0400 Received: from mga02.intel.com ([134.134.136.20]:33405 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750929Ab2HaFSu (ORCPT ); Fri, 31 Aug 2012 01:18:50 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,345,1344236400"; d="p7s'?scan'208";a="187452425" From: "Wei, Gang" To: "Zhang, Xiaoyan" , "linux-kernel@vger.kernel.org" CC: "Cihula, Joseph" , "hpa@zytor.com" , "tglx@linutronix.de" , "mingo@redhat.com" , "Wei, Gang" Subject: RE: [PATCH] x86/kernel: remove tboot 1:1 page table creation code Thread-Topic: [PATCH] x86/kernel: remove tboot 1:1 page table creation code Thread-Index: AQHNhnOFPY6M5//ZPkWrUVKMaEssSpdzYoSA Date: Fri, 31 Aug 2012 05:18:45 +0000 Message-ID: References: <1377870567-1528-1-git-send-email-xiaoyan.zhang@intel.com> In-Reply-To: <1377870567-1528-1-git-send-email-xiaoyan.zhang@intel.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.239.127.40] Content-Type: multipart/signed; micalg=SHA1; protocol="application/x-pkcs7-signature"; boundary="----=_NextPart_000_013A_01CD877B.2659F810" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 15916 Lines: 298 ------=_NextPart_000_013A_01CD877B.2659F810 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Acked-by: Gang Wei > From: Xiaoyan Zhang > > For TXT boot, while Linux kernel trys to shutdown/S3/S4/reboot, it need to > jump back to tboot code and do TXT teardown work. Previously kernel zapped > all mem page identity mapping (va=pa) after booting, so tboot code mem > address > was mapped again with identity mapping. Now kernel didn't zap the identity > mapping page table, so tboot related code can remove the remapping code > before > trapping back now. > > Signed-off-by: Xiaoyan Zhang > --- > arch/x86/kernel/tboot.c | 78 +++-------------------------------------------- > 1 files changed, 5 insertions(+), 73 deletions(-) > > diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c > index f84fe00..d4f460f 100644 > --- a/arch/x86/kernel/tboot.c > +++ b/arch/x86/kernel/tboot.c > @@ -103,71 +103,13 @@ void __init tboot_probe(void) > pr_debug("tboot_size: 0x%x\n", tboot->tboot_size); > } > > -static pgd_t *tboot_pg_dir; > -static struct mm_struct tboot_mm = { > - .mm_rb = RB_ROOT, > - .pgd = swapper_pg_dir, > - .mm_users = ATOMIC_INIT(2), > - .mm_count = ATOMIC_INIT(1), > - .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem), > - .page_table_lock = > __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), > - .mmlist = LIST_HEAD_INIT(init_mm.mmlist), > -}; > - > static inline void switch_to_tboot_pt(void) > { > - write_cr3(virt_to_phys(tboot_pg_dir)); > -} > - > -static int map_tboot_page(unsigned long vaddr, unsigned long pfn, > - pgprot_t prot) > -{ > - pgd_t *pgd; > - pud_t *pud; > - pmd_t *pmd; > - pte_t *pte; > - > - pgd = pgd_offset(&tboot_mm, vaddr); > - pud = pud_alloc(&tboot_mm, pgd, vaddr); > - if (!pud) > - return -1; > - pmd = pmd_alloc(&tboot_mm, pud, vaddr); > - if (!pmd) > - return -1; > - pte = pte_alloc_map(&tboot_mm, NULL, pmd, vaddr); > - if (!pte) > - return -1; > - set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot)); > - pte_unmap(pte); > - return 0; > -} > - > -static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn, > - unsigned long nr) > -{ > - /* Reuse the original kernel mapping */ > - tboot_pg_dir = pgd_alloc(&tboot_mm); > - if (!tboot_pg_dir) > - return -1; > - > - for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) { > - if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC)) > - return -1; > - } > - > - return 0; > -} > - > -static void tboot_create_trampoline(void) > -{ > - u32 map_base, map_size; > - > - /* Create identity map for tboot shutdown code. */ > - map_base = PFN_DOWN(tboot->tboot_base); > - map_size = PFN_UP(tboot->tboot_size); > - if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size)) > - panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n", > - map_base, map_size); > +#ifdef CONFIG_X86_32 > + load_cr3(initial_page_table); > +#else > + write_cr3(real_mode_header->trampoline_pgd); > +#endif > } > > #ifdef CONFIG_ACPI_SLEEP > @@ -225,14 +167,6 @@ void tboot_shutdown(u32 shutdown_type) > if (!tboot_enabled()) > return; > > - /* > - * if we're being called before the 1:1 mapping is set up then just > - * return and let the normal shutdown happen; this should only be > - * due to very early panic() > - */ > - if (!tboot_pg_dir) > - return; > - > /* if this is S3 then set regions to MAC */ > if (shutdown_type == TB_SHUTDOWN_S3) > if (tboot_setup_sleep()) > @@ -343,8 +277,6 @@ static __init int tboot_late_init(void) > if (!tboot_enabled()) > return 0; > > - tboot_create_trampoline(); > - > atomic_set(&ap_wfs_count, 0); > register_hotcpu_notifier(&tboot_cpu_notifier); > > -- > 1.7.7.6 ------=_NextPart_000_013A_01CD877B.2659F810 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIdxjCCAyAw ggKJoAMCAQICBDXe9M8wDQYJKoZIhvcNAQEFBQAwTjELMAkGA1UEBhMCVVMxEDAOBgNVBAoTB0Vx dWlmYXgxLTArBgNVBAsTJEVxdWlmYXggU2VjdXJlIENlcnRpZmljYXRlIEF1dGhvcml0eTAeFw05 ODA4MjIxNjQxNTFaFw0xODA4MjIxNjQxNTFaME4xCzAJBgNVBAYTAlVTMRAwDgYDVQQKEwdFcXVp ZmF4MS0wKwYDVQQLEyRFcXVpZmF4IFNlY3VyZSBDZXJ0aWZpY2F0ZSBBdXRob3JpdHkwgZ8wDQYJ KoZIhvcNAQEBBQADgY0AMIGJAoGBAMFdsVhnCGLuoJotHwhtkRRomAoe/toEbxOEYiHD0XzOnwXg uAHwTjTs4oqVBGSs8WtTXwWzy2eAv0ICjv7dAQns4QAUT/z78AzdQ7pbK+EfgHCZFVeTFvEPl2q3 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