From patchwork Mon Apr 26 11:58:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12224193 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A3B05C433B4 for ; Mon, 26 Apr 2021 12:00:01 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E595D60232 for ; Mon, 26 Apr 2021 11:59:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E595D60232 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:39098 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lazu9-0006Xm-N7 for qemu-devel@archiver.kernel.org; Mon, 26 Apr 2021 07:59:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42242) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1laztK-0005gw-Kb for qemu-devel@nongnu.org; Mon, 26 Apr 2021 07:59:06 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:35808) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1laztJ-0005Je-32 for qemu-devel@nongnu.org; Mon, 26 Apr 2021 07:59:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619438344; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2xfjkPnQFPRjK9jBH/26YtD7u3pk0Xa3TCgZG3qQIhc=; b=Fe+2+Gl/NMo0Fc5BiRnKp1frHtA61IrztRLRdOuhDAyM1ne98NI4vM5Owj7U2pKbs0/MbR 99VHULW2S8Z651dIV4DS71FYL1TjUj7i0IrQ4bPdxkMu2QbupQSa5nIce9IrhQuLJgttt7 TKXEkdsoYRZaPV5yOZ4CwTNs/zltIBQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-234-ozEL8TJpNJ6EPfoL1Ru9mQ-1; Mon, 26 Apr 2021 07:59:02 -0400 X-MC-Unique: ozEL8TJpNJ6EPfoL1Ru9mQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 695596409F; Mon, 26 Apr 2021 11:59:01 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.192.73]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8FF9560855; Mon, 26 Apr 2021 11:58:58 +0000 (UTC) From: Maxim Levitsky To: qemu-devel@nongnu.org Subject: [PATCH v2 1/2] kvm: update kernel headers for KVM_{GET|SET}_SREGS2 Date: Mon, 26 Apr 2021 14:58:49 +0300 Message-Id: <20210426115850.1003501-2-mlevitsk@redhat.com> In-Reply-To: <20210426115850.1003501-1-mlevitsk@redhat.com> References: <20210426115850.1003501-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Received-SPF: pass client-ip=170.10.133.124; envelope-from=mlevitsk@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.219, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Cornelia Huck , Eduardo Habkost , kvm@vger.kernel.org, "Michael S. Tsirkin" , Marcelo Tosatti , Richard Henderson , Maxim Levitsky , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Maxim Levitsky --- linux-headers/asm-x86/kvm.h | 13 +++++++++++++ linux-headers/linux/kvm.h | 5 +++++ 2 files changed, 18 insertions(+) diff --git a/linux-headers/asm-x86/kvm.h b/linux-headers/asm-x86/kvm.h index 8e76d3701d..d61dc76e24 100644 --- a/linux-headers/asm-x86/kvm.h +++ b/linux-headers/asm-x86/kvm.h @@ -158,6 +158,19 @@ struct kvm_sregs { __u64 interrupt_bitmap[(KVM_NR_INTERRUPTS + 63) / 64]; }; +struct kvm_sregs2 { + /* out (KVM_GET_SREGS2) / in (KVM_SET_SREGS2) */ + struct kvm_segment cs, ds, es, fs, gs, ss; + struct kvm_segment tr, ldt; + struct kvm_dtable gdt, idt; + __u64 cr0, cr2, cr3, cr4, cr8; + __u64 efer; + __u64 apic_base; + __u64 flags; + __u64 pdptrs[4]; +}; +#define KVM_SREGS2_FLAGS_PDPTRS_VALID 1 + /* for KVM_GET_FPU and KVM_SET_FPU */ struct kvm_fpu { __u8 fpr[8][16]; diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h index 020b62a619..22ea29a243 100644 --- a/linux-headers/linux/kvm.h +++ b/linux-headers/linux/kvm.h @@ -1056,6 +1056,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_ENFORCE_PV_FEATURE_CPUID 190 #define KVM_CAP_SYS_HYPERV_CPUID 191 #define KVM_CAP_DIRTY_LOG_RING 192 +#define KVM_CAP_SREGS2 199 #ifdef KVM_CAP_IRQ_ROUTING @@ -1563,6 +1564,10 @@ struct kvm_pv_cmd { /* Available with KVM_CAP_DIRTY_LOG_RING */ #define KVM_RESET_DIRTY_RINGS _IO(KVMIO, 0xc7) + +#define KVM_GET_SREGS2 _IOR(KVMIO, 0xcc, struct kvm_sregs2) +#define KVM_SET_SREGS2 _IOW(KVMIO, 0xcd, struct kvm_sregs2) + /* Secure Encrypted Virtualization command */ enum sev_cmd_id { /* Guest initialization commands */ From patchwork Mon Apr 26 11:58:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12224195 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B949C433B4 for ; Mon, 26 Apr 2021 12:02:22 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 83A6061178 for ; Mon, 26 Apr 2021 12:02:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 83A6061178 Authentication-Results: mail.kernel.org; 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bh=TlZMOK34N8iPKlCme/mC0AoDzOKm03r6/1rUsiDOfQQ=; b=BxI0VmFFKVfggY39sBRMZhjgQ3fxyjElEYsTXmyXENUBWaRk3ijS8VFHw2t4rUzoZ9RDNE c6qpDAXBEpJ1oqFvLY7Trwz/6vFUlxz2f2qVV5zixvswu6/VkI/cZT5CQJPD7aZir59Z5J aYIjXZyU+oAZu+FhvteRL0ySeXUhlYY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-127-FbPqShkvNtm5Meg1Gg5EMg-1; Mon, 26 Apr 2021 07:59:05 -0400 X-MC-Unique: FbPqShkvNtm5Meg1Gg5EMg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D5506107ACCD; Mon, 26 Apr 2021 11:59:04 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.192.73]) by smtp.corp.redhat.com (Postfix) with ESMTP id 03E27687F8; Mon, 26 Apr 2021 11:59:01 +0000 (UTC) From: Maxim Levitsky To: qemu-devel@nongnu.org Subject: [PATCH v2 2/2] KVM: use KVM_{GET|SET}_SREGS2 when supported. Date: Mon, 26 Apr 2021 14:58:50 +0300 Message-Id: <20210426115850.1003501-3-mlevitsk@redhat.com> In-Reply-To: <20210426115850.1003501-1-mlevitsk@redhat.com> References: <20210426115850.1003501-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Received-SPF: pass client-ip=216.205.24.124; envelope-from=mlevitsk@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.219, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Cornelia Huck , Eduardo Habkost , kvm@vger.kernel.org, "Michael S. Tsirkin" , Marcelo Tosatti , Richard Henderson , Maxim Levitsky , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This allows to make PDPTRs part of the migration stream and thus not reload them after migration which is against X86 spec. Signed-off-by: Maxim Levitsky --- accel/kvm/kvm-all.c | 5 ++ include/sysemu/kvm.h | 4 ++ target/i386/cpu.h | 3 ++ target/i386/kvm/kvm.c | 107 +++++++++++++++++++++++++++++++++++++++++- target/i386/machine.c | 30 ++++++++++++ 5 files changed, 147 insertions(+), 2 deletions(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index b6d9f92f15..0397b3cb2b 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -142,6 +142,7 @@ bool kvm_msi_via_irqfd_allowed; bool kvm_gsi_routing_allowed; bool kvm_gsi_direct_mapping; bool kvm_allowed; +bool kvm_sregs2; bool kvm_readonly_mem_allowed; bool kvm_vm_attributes_allowed; bool kvm_direct_msi_allowed; @@ -2186,6 +2187,10 @@ static int kvm_init(MachineState *ms) kvm_ioeventfd_any_length_allowed = (kvm_check_extension(s, KVM_CAP_IOEVENTFD_ANY_LENGTH) > 0); + + kvm_sregs2 = + (kvm_check_extension(s, KVM_CAP_SREGS2) > 0); + kvm_state = s; ret = kvm_arch_init(ms, s); diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index a1ab1ee12d..b3d4538c55 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -32,6 +32,7 @@ #ifdef CONFIG_KVM_IS_POSSIBLE extern bool kvm_allowed; +extern bool kvm_sregs2; extern bool kvm_kernel_irqchip; extern bool kvm_split_irqchip; extern bool kvm_async_interrupts_allowed; @@ -139,6 +140,9 @@ extern bool kvm_msi_use_devid; */ #define kvm_gsi_direct_mapping() (kvm_gsi_direct_mapping) + +#define kvm_supports_sregs2() (kvm_sregs2) + /** * kvm_readonly_mem_enabled: * diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 570f916878..ac877097d4 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1422,6 +1422,9 @@ typedef struct CPUX86State { SegmentCache idt; /* only base and limit are used */ target_ulong cr[5]; /* NOTE: cr1 is unused */ + + bool pdptrs_valid; + uint64_t pdptrs[4]; int32_t a20_mask; BNDReg bnd_regs[4]; diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 7fe9f52710..93570706e1 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -2514,6 +2514,61 @@ static int kvm_put_sregs(X86CPU *cpu) return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_SREGS, &sregs); } +static int kvm_put_sregs2(X86CPU *cpu) +{ + CPUX86State *env = &cpu->env; + struct kvm_sregs2 sregs; + int i; + + sregs.flags = 0; + + if ((env->eflags & VM_MASK)) { + set_v8086_seg(&sregs.cs, &env->segs[R_CS]); + set_v8086_seg(&sregs.ds, &env->segs[R_DS]); + set_v8086_seg(&sregs.es, &env->segs[R_ES]); + set_v8086_seg(&sregs.fs, &env->segs[R_FS]); + set_v8086_seg(&sregs.gs, &env->segs[R_GS]); + set_v8086_seg(&sregs.ss, &env->segs[R_SS]); + } else { + set_seg(&sregs.cs, &env->segs[R_CS]); + set_seg(&sregs.ds, &env->segs[R_DS]); + set_seg(&sregs.es, &env->segs[R_ES]); + set_seg(&sregs.fs, &env->segs[R_FS]); + set_seg(&sregs.gs, &env->segs[R_GS]); + set_seg(&sregs.ss, &env->segs[R_SS]); + } + + set_seg(&sregs.tr, &env->tr); + set_seg(&sregs.ldt, &env->ldt); + + sregs.idt.limit = env->idt.limit; + sregs.idt.base = env->idt.base; + memset(sregs.idt.padding, 0, sizeof sregs.idt.padding); + sregs.gdt.limit = env->gdt.limit; + sregs.gdt.base = env->gdt.base; + memset(sregs.gdt.padding, 0, sizeof sregs.gdt.padding); + + sregs.cr0 = env->cr[0]; + sregs.cr2 = env->cr[2]; + sregs.cr3 = env->cr[3]; + sregs.cr4 = env->cr[4]; + + sregs.cr8 = cpu_get_apic_tpr(cpu->apic_state); + sregs.apic_base = cpu_get_apic_base(cpu->apic_state); + + sregs.efer = env->efer; + + if (env->pdptrs_valid) { + for (i = 0; i < 4; i++) { + sregs.pdptrs[i] = env->pdptrs[i]; + } + sregs.flags |= KVM_SREGS2_FLAGS_PDPTRS_VALID; + } + + return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_SREGS2, &sregs); +} + + static void kvm_msr_buf_reset(X86CPU *cpu) { memset(cpu->kvm_msr_buf, 0, MSR_BUF_SIZE); @@ -3175,6 +3230,53 @@ static int kvm_get_sregs(X86CPU *cpu) return 0; } +static int kvm_get_sregs2(X86CPU *cpu) +{ + CPUX86State *env = &cpu->env; + struct kvm_sregs2 sregs; + int i, ret; + + ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_SREGS2, &sregs); + if (ret < 0) { + return ret; + } + + get_seg(&env->segs[R_CS], &sregs.cs); + get_seg(&env->segs[R_DS], &sregs.ds); + get_seg(&env->segs[R_ES], &sregs.es); + get_seg(&env->segs[R_FS], &sregs.fs); + get_seg(&env->segs[R_GS], &sregs.gs); + get_seg(&env->segs[R_SS], &sregs.ss); + + get_seg(&env->tr, &sregs.tr); + get_seg(&env->ldt, &sregs.ldt); + + env->idt.limit = sregs.idt.limit; + env->idt.base = sregs.idt.base; + env->gdt.limit = sregs.gdt.limit; + env->gdt.base = sregs.gdt.base; + + env->cr[0] = sregs.cr0; + env->cr[2] = sregs.cr2; + env->cr[3] = sregs.cr3; + env->cr[4] = sregs.cr4; + + env->efer = sregs.efer; + + env->pdptrs_valid = sregs.flags & KVM_SREGS2_FLAGS_PDPTRS_VALID; + + if (env->pdptrs_valid) { + for (i = 0; i < 4; i++) { + env->pdptrs[i] = sregs.pdptrs[i]; + } + } + + /* changes to apic base and cr8/tpr are read back via kvm_arch_post_run */ + x86_update_hflags(env); + + return 0; +} + static int kvm_get_msrs(X86CPU *cpu) { CPUX86State *env = &cpu->env; @@ -4000,7 +4102,8 @@ int kvm_arch_put_registers(CPUState *cpu, int level) assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu)); /* must be before kvm_put_nested_state so that EFER.SVME is set */ - ret = kvm_put_sregs(x86_cpu); + ret = kvm_supports_sregs2() ? kvm_put_sregs2(x86_cpu) : + kvm_put_sregs(x86_cpu); if (ret < 0) { return ret; } @@ -4105,7 +4208,7 @@ int kvm_arch_get_registers(CPUState *cs) if (ret < 0) { goto out; } - ret = kvm_get_sregs(cpu); + ret = kvm_supports_sregs2() ? kvm_get_sregs2(cpu) : kvm_get_sregs(cpu); if (ret < 0) { goto out; } diff --git a/target/i386/machine.c b/target/i386/machine.c index 137604ddb8..ae0144cf34 100644 --- a/target/i386/machine.c +++ b/target/i386/machine.c @@ -1396,6 +1396,35 @@ static const VMStateDescription vmstate_msr_tsx_ctrl = { } }; +static bool pdptrs_needed(void *opaque) +{ + X86CPU *cpu = opaque; + CPUX86State *env = &cpu->env; + return env->pdptrs_valid; +} + +static int pdptrs_post_load(void *opaque, int version_id) +{ + X86CPU *cpu = opaque; + CPUX86State *env = &cpu->env; + env->pdptrs_valid = true; + return 0; +} + + +static const VMStateDescription vmstate_pdptrs = { + .name = "cpu/pdptrs", + .version_id = 1, + .minimum_version_id = 1, + .needed = pdptrs_needed, + .post_load = pdptrs_post_load, + .fields = (VMStateField[]) { + VMSTATE_UINT64_ARRAY(env.pdptrs, X86CPU, 4), + VMSTATE_END_OF_LIST() + } +}; + + VMStateDescription vmstate_x86_cpu = { .name = "cpu", .version_id = 12, @@ -1531,6 +1560,7 @@ VMStateDescription vmstate_x86_cpu = { &vmstate_nested_state, #endif &vmstate_msr_tsx_ctrl, + &vmstate_pdptrs, NULL } };