From patchwork Mon Jul 31 13:09:13 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Hogan X-Patchwork-Id: 795764 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xLfxr6ddjz9s8J for ; Mon, 31 Jul 2017 23:12:29 +1000 (AEST) Received: from localhost ([::1]:59509 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dcAUk-0005MS-Aj for incoming@patchwork.ozlabs.org; Mon, 31 Jul 2017 09:12:26 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39299) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dcASE-0003yy-4a for qemu-devel@nongnu.org; Mon, 31 Jul 2017 09:09:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dcASA-0002t4-4U for qemu-devel@nongnu.org; Mon, 31 Jul 2017 09:09:50 -0400 Received: from mailapp01.imgtec.com ([195.59.15.196]:35762) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dcAS9-0002qe-Rl for qemu-devel@nongnu.org; Mon, 31 Jul 2017 09:09:46 -0400 Received: from HHMAIL01.hh.imgtec.org (unknown [10.100.10.19]) by Forcepoint Email with ESMTPS id 4CA84E5885F8F; Mon, 31 Jul 2017 14:09:38 +0100 (IST) Received: from jhogan-linux.le.imgtec.org (192.168.154.110) by HHMAIL01.hh.imgtec.org (10.100.10.21) with Microsoft SMTP Server (TLS) id 14.3.294.0; Mon, 31 Jul 2017 14:09:41 +0100 From: James Hogan To: Date: Mon, 31 Jul 2017 14:09:13 +0100 Message-ID: X-Mailer: git-send-email 2.13.2 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [192.168.154.110] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 195.59.15.196 Subject: [Qemu-devel] [PATCH 2/2] mips: Add KVM T&E segment support for TCG X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yongbok Kim , Paolo Bonzini , James Hogan , kvm@vger.kernel.org, Aurelien Jarno Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" MIPS KVM trap & emulate guest kernels have a different segment layout compared with traditional MIPS kernels, to allow both the user and kernel code to run from the user address segment without repeatedly trapping to KVM. QEMU currently supports this layout only for KVM, but its sometimes useful to be able to run these kernels in QEMU on a PC, so enable it for TCG too. This also paves the way for MIPS KVM VZ support (which uses the normal virtual memory layout) by abstracting whether user mode kernel segments are in use. Suggested-by: Paolo Bonzini Signed-off-by: James Hogan Cc: Yongbok Kim Cc: Aurelien Jarno Cc: Paolo Bonzini Cc: kvm@vger.kernel.org Reviewed-by: Richard Henderson --- hw/mips/addr.c | 12 ++++++++++++ hw/mips/mips_malta.c | 17 +++++++---------- include/hw/mips/cpudevs.h | 5 +++-- target/mips/helper.c | 4 ++-- target/mips/translate.c | 4 ++-- 5 files changed, 26 insertions(+), 16 deletions(-) diff --git a/hw/mips/addr.c b/hw/mips/addr.c index e4e86b4a7548..e552dfca843e 100644 --- a/hw/mips/addr.c +++ b/hw/mips/addr.c @@ -24,6 +24,8 @@ #include "hw/hw.h" #include "hw/mips/cpudevs.h" +static int mips_um_ksegs; + uint64_t cpu_mips_kseg0_to_phys(void *opaque, uint64_t addr) { return addr & 0x1fffffffll; @@ -38,3 +40,13 @@ uint64_t cpu_mips_kvm_um_phys_to_kseg0(void *opaque, uint64_t addr) { return addr | 0x40000000ll; } + +int mips_um_ksegs_enabled(void) +{ + return mips_um_ksegs; +} + +void mips_um_ksegs_enable(void) +{ + mips_um_ksegs = 1; +} diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c index 3487d16f61eb..f3354362890a 100644 --- a/hw/mips/mips_malta.c +++ b/hw/mips/mips_malta.c @@ -816,23 +816,20 @@ static int64_t load_kernel (void) exit(1); } - /* Sanity check where the kernel has been linked */ - if (kvm_enabled()) { - if (kernel_entry & 0x80000000ll) { + /* Check where the kernel has been linked */ + if (kernel_entry & 0x80000000ll) { + if (kvm_enabled()) { error_report("KVM guest kernels must be linked in useg. " "Did you forget to enable CONFIG_KVM_GUEST?"); exit(1); } - xlate_to_kseg0 = cpu_mips_kvm_um_phys_to_kseg0; + xlate_to_kseg0 = cpu_mips_phys_to_kseg0; } else { - if (!(kernel_entry & 0x80000000ll)) { - error_report("KVM guest kernels aren't supported with TCG. " - "Did you unintentionally enable CONFIG_KVM_GUEST?"); - exit(1); - } + /* if kernel entry is in useg it is probably a KVM T&E kernel */ + mips_um_ksegs_enable(); - xlate_to_kseg0 = cpu_mips_phys_to_kseg0; + xlate_to_kseg0 = cpu_mips_kvm_um_phys_to_kseg0; } /* load initrd */ diff --git a/include/hw/mips/cpudevs.h b/include/hw/mips/cpudevs.h index 698339b83ec7..0c114f486edb 100644 --- a/include/hw/mips/cpudevs.h +++ b/include/hw/mips/cpudevs.h @@ -5,11 +5,12 @@ /* Definitions for MIPS CPU internal devices. */ -/* mips_addr.c */ +/* addr.c */ uint64_t cpu_mips_kseg0_to_phys(void *opaque, uint64_t addr); uint64_t cpu_mips_phys_to_kseg0(void *opaque, uint64_t addr); uint64_t cpu_mips_kvm_um_phys_to_kseg0(void *opaque, uint64_t addr); - +int mips_um_ksegs_enabled(void); +void mips_um_ksegs_enable(void); /* mips_int.c */ void cpu_mips_irq_init_cpu(MIPSCPU *cpu); diff --git a/target/mips/helper.c b/target/mips/helper.c index 05883b9f4251..ca39aca08a64 100644 --- a/target/mips/helper.c +++ b/target/mips/helper.c @@ -19,10 +19,10 @@ #include "qemu/osdep.h" #include "cpu.h" -#include "sysemu/kvm.h" #include "exec/exec-all.h" #include "exec/cpu_ldst.h" #include "exec/log.h" +#include "hw/mips/cpudevs.h" enum { TLBRET_XI = -6, @@ -225,7 +225,7 @@ static int get_physical_address (CPUMIPSState *env, hwaddr *physical, #define KVM_KSEG0_BASE ((target_ulong)(int32_t)0x40000000UL) #define KVM_KSEG2_BASE ((target_ulong)(int32_t)0x60000000UL) - if (kvm_enabled()) { + if (mips_um_ksegs_enabled()) { /* KVM T&E adds guest kernel segments in useg */ if (real_address >= KVM_KSEG0_BASE) { if (real_address < KVM_KSEG2_BASE) { diff --git a/target/mips/translate.c b/target/mips/translate.c index 51626aead32c..4635012d6436 100644 --- a/target/mips/translate.c +++ b/target/mips/translate.c @@ -27,10 +27,10 @@ #include "exec/exec-all.h" #include "tcg-op.h" #include "exec/cpu_ldst.h" +#include "hw/mips/cpudevs.h" #include "exec/helper-proto.h" #include "exec/helper-gen.h" -#include "sysemu/kvm.h" #include "exec/semihost.h" #include "target/mips/trace.h" @@ -20639,7 +20639,7 @@ void cpu_state_reset(CPUMIPSState *env) env->CP0_Wired = 0; env->CP0_GlobalNumber = (cs->cpu_index & 0xFF) << CP0GN_VPId; env->CP0_EBase = (cs->cpu_index & 0x3FF); - if (kvm_enabled()) { + if (mips_um_ksegs_enabled()) { env->CP0_EBase |= 0x40000000; } else { env->CP0_EBase |= (int32_t)0x80000000;