From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f198.google.com (mail-wr0-f198.google.com [209.85.128.198]) by kanga.kvack.org (Postfix) with ESMTP id D5FFD6B0253 for ; Mon, 5 Mar 2018 05:27:35 -0500 (EST) Received: by mail-wr0-f198.google.com with SMTP id x97so11086301wrb.3 for ; Mon, 05 Mar 2018 02:27:35 -0800 (PST) Received: from theia.8bytes.org (8bytes.org. [81.169.241.247]) by mx.google.com with ESMTPS id j10si3806510edj.1.2018.03.05.02.26.13 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 05 Mar 2018 02:26:13 -0800 (PST) From: Joerg Roedel Subject: [PATCH 10/34] x86/entry/32: Introduce SAVE_ALL_NMI and RESTORE_ALL_NMI Date: Mon, 5 Mar 2018 11:25:39 +0100 Message-Id: <1520245563-8444-11-git-send-email-joro@8bytes.org> In-Reply-To: <1520245563-8444-1-git-send-email-joro@8bytes.org> References: <1520245563-8444-1-git-send-email-joro@8bytes.org> Sender: owner-linux-mm@kvack.org List-ID: To: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds , Andy Lutomirski , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , aliguori@amazon.com, daniel.gruss@iaik.tugraz.at, hughd@google.com, keescook@google.com, Andrea Arcangeli , Waiman Long , Pavel Machek , jroedel@suse.de, joro@8bytes.org From: Joerg Roedel These macros will be used in the NMI handler code and replace plain SAVE_ALL and RESTORE_REGS there. We will add the NMI-specific CR3-switch to these macros later. Signed-off-by: Joerg Roedel --- arch/x86/entry/entry_32.S | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index 1b5656d..bb0bd896 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -167,6 +167,9 @@ .endm +.macro SAVE_ALL_NMI + SAVE_ALL +.endm /* * This is a sneaky trick to help the unwinder find pt_regs on the stack. The * frame pointer is replaced with an encoded pointer to pt_regs. The encoding @@ -224,6 +227,18 @@ RESTORE_SKIP_SEGMENTS \pop .endm +.macro RESTORE_ALL_NMI pop=0 + /* + * Restore segments - might cause exceptions when loading + * user-space segments + */ + RESTORE_SEGMENTS + + /* Restore integer registers and unwind stack to iret frame */ + RESTORE_INT_REGS + RESTORE_SKIP_SEGMENTS \pop +.endm + .macro CHECK_AND_APPLY_ESPFIX #ifdef CONFIG_X86_ESPFIX32 #define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8) @@ -1148,7 +1163,7 @@ ENTRY(nmi) #endif pushl %eax # pt_regs->orig_ax - SAVE_ALL + SAVE_ALL_NMI ENCODE_FRAME_POINTER xorl %edx, %edx # zero error code movl %esp, %eax # pt_regs pointer @@ -1176,7 +1191,7 @@ ENTRY(nmi) .Lnmi_return: CHECK_AND_APPLY_ESPFIX - RESTORE_REGS 4 + RESTORE_ALL_NMI pop=4 jmp .Lirq_return #ifdef CONFIG_X86_ESPFIX32 @@ -1192,12 +1207,12 @@ ENTRY(nmi) pushl 16(%esp) .endr pushl %eax - SAVE_ALL + SAVE_ALL_NMI ENCODE_FRAME_POINTER FIXUP_ESPFIX_STACK # %eax == %esp xorl %edx, %edx # zero error code call do_nmi - RESTORE_REGS + RESTORE_ALL_NMI lss 12+4(%esp), %esp # back to espfix stack jmp .Lirq_return #endif -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org