From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754222AbdBNTn3 (ORCPT ); Tue, 14 Feb 2017 14:43:29 -0500 Received: from mail-oi0-f45.google.com ([209.85.218.45]:35597 "EHLO mail-oi0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751644AbdBNTnK (ORCPT ); Tue, 14 Feb 2017 14:43:10 -0500 From: Thomas Garnier To: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Thomas Garnier , Kees Cook , Andy Lutomirski , Borislav Petkov , Paul Gortmaker , Andy Lutomirski , "Rafael J . Wysocki" , Len Brown , Pavel Machek , Jiri Kosina , Matt Fleming , Ard Biesheuvel , Boris Ostrovsky , Juergen Gross , Rusty Russell , Peter Zijlstra , Christian Borntraeger , "Luis R . Rodriguez" , He Chen , Brian Gerst , Stanislaw Gruszka , Arnd Bergmann , Adam Buchbinder , Dave Hansen , Vitaly Kuznetsov , Josh Poimboeuf , Tim Chen , Rik van Riel , Andi Kleen , Jiri Olsa , Michael Ellerman , Joerg Roedel , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Cc: x86@kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-pm@vger.kernel.org, linux-efi@vger.kernel.org, xen-devel@lists.xenproject.org, lguest@lists.ozlabs.org, kvm@vger.kernel.org, kernel-hardening@lists.openwall.com Subject: [PATCH v3 4/4] KVM: VMX: Simplify segment_base Date: Tue, 14 Feb 2017 11:42:59 -0800 Message-Id: <20170214194259.75960-4-thgarnie@google.com> X-Mailer: git-send-email 2.11.0.483.g087da7b7c-goog In-Reply-To: <20170214194259.75960-1-thgarnie@google.com> References: <20170214194259.75960-1-thgarnie@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The KVM segment_base function is confusing. This patch replaces integers with appropriate flags, simplify constructs and add comments. Signed-off-by: Thomas Garnier --- Based on next-20170213 --- arch/x86/kvm/vmx.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 99167f20bc34..edb8326108dd 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2062,25 +2062,35 @@ static unsigned long segment_base(u16 selector) struct desc_struct *d; unsigned long table_base; unsigned long v; + u32 high32; - if (!(selector & ~3)) + if (!(selector & ~SEGMENT_RPL_MASK)) return 0; - table_base = get_current_gdt_rw_vaddr(); - - if (selector & 4) { /* from ldt */ + /* LDT selector */ + if ((selector & SEGMENT_TI_MASK) == SEGMENT_LDT) { u16 ldt_selector = kvm_read_ldt(); - if (!(ldt_selector & ~3)) + if (!(ldt_selector & ~SEGMENT_RPL_MASK)) return 0; table_base = segment_base(ldt_selector); + } else { + table_base = get_current_gdt_rw_vaddr(); } - d = (struct desc_struct *)(table_base + (selector & ~7)); + + d = (struct desc_struct *)table_base + (selector >> 3); v = get_desc_base(d); #ifdef CONFIG_X86_64 - if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11)) - v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32; + /* + * Extend the virtual address if we have a system descriptor entry for + * LDT or TSS (available or busy). + */ + if (d->s == 0 && (d->type == DESC_LDT || d->type == DESC_TSS || + d->type == 11/*Busy TSS */)) { + high32 = ((struct ldttss_desc64 *)d)->base3; + v |= (u64)high32 << 32; + } #endif return v; } -- 2.11.0.483.g087da7b7c-goog