From patchwork Tue Mar 23 01:02:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicholas Piggin X-Patchwork-Id: 1456898 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=Tq5Wk2ex; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4F4Cns55NCz9t1f for ; Tue, 23 Mar 2021 12:04:49 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231360AbhCWBER (ORCPT ); Mon, 22 Mar 2021 21:04:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231370AbhCWBD6 (ORCPT ); Mon, 22 Mar 2021 21:03:58 -0400 Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2601C061574 for ; Mon, 22 Mar 2021 18:03:58 -0700 (PDT) Received: by mail-pg1-x535.google.com with SMTP id r17so10054650pgi.0 for ; Mon, 22 Mar 2021 18:03:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=t5ugjnxxrU5adhryU7YI81Wpf98FTMZI345VcCUxwwI=; b=Tq5Wk2exl5ZVQQbafdg+G9/w76Z5e1XC0WxjmkgbfFZtPZO6Fv/B8IyIz1bW3PrRyD 13iHg6TWjOqXgkhfGPWxFsFH7UYXKhVXICg4/L9DGKwnubVB0d7hoekpzbVmU2WJdDic Jebsu+k+kXzs3ztmH6S6voJMWj9oipUkA+HOc6+jbRG+YAF9Omj2obmpYv/vL3/eELYl NHZnW7WjSvRhNVs0mnP733HCRSruD5SUG8XPDRIk549ZkdY1kAW7mHMAzSViswMvH+PI eP/ejADwvbaHb0B7I6o7SVRX4ZB+jFgtxKx6iMapKQRmwx3pJf/gymgwI7aJUXNthSsn 3W4A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=t5ugjnxxrU5adhryU7YI81Wpf98FTMZI345VcCUxwwI=; b=KC/SUMbqDOUvEOTo7KNzUMF5vj28uBqb7nq/LIvOcdjj+zt/pjLXYsy9zWPWNsuOJq 5/hkd0Fe+XbXudLxGfQaKuQQDVZng23+BbjixII2OHk9xEv900wDGvNiPRuTniyGOfjS jTaGt6Pv+UB1N5sx083BUNEnoW/WPVm3fpJV6FScVZ022pWtNBExQ9y3Vg4RjNxraSBK jJwUxv40jcpor8Jq4s0t8im9JqnlS6DEFleHRJEcZ+kofZeHXiwwYbuLLt/N1uNSpFoV Oih+bN0p7KmjiF2Ue3hrcmchOBmYJAqkS2wUgav/G/w7Csx1O4BJ1ns8C2TLHvwj0HoA 1Zzw== X-Gm-Message-State: AOAM533CkgG+W+mPCy/W+9FKYU177TPYWMH1wFsC11E+4KZx5qEEouPa PdLBMSa6/d9gBrSG1aolWtrM/5NYx2Q= X-Google-Smtp-Source: ABdhPJxNCvFCpE37jCXV4riqfJYDk8MjfWSVZkfaf9W7lbtFxKd8I0P7QDPmA+VOI/KLTL5ayhf8WQ== X-Received: by 2002:a63:f754:: with SMTP id f20mr1775926pgk.382.1616461438126; Mon, 22 Mar 2021 18:03:58 -0700 (PDT) Received: from bobo.ibm.com ([58.84.78.96]) by smtp.gmail.com with ESMTPSA id e7sm14491894pfc.88.2021.03.22.18.03.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Mar 2021 18:03:57 -0700 (PDT) From: Nicholas Piggin To: kvm-ppc@vger.kernel.org Cc: Nicholas Piggin , linuxppc-dev@lists.ozlabs.org, Daniel Axtens , Fabiano Rosas Subject: [PATCH v4 13/46] KVM: PPC: Book3S 64: Move GUEST_MODE_SKIP test into KVM Date: Tue, 23 Mar 2021 11:02:32 +1000 Message-Id: <20210323010305.1045293-14-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210323010305.1045293-1-npiggin@gmail.com> References: <20210323010305.1045293-1-npiggin@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org Move the GUEST_MODE_SKIP logic into KVM code. This is quite a KVM internal detail that has no real need to be in common handlers. Also add a comment explaining why this thing exists. Reviewed-by: Daniel Axtens Reviewed-by: Fabiano Rosas Signed-off-by: Nicholas Piggin --- arch/powerpc/kernel/exceptions-64s.S | 60 ---------------------------- arch/powerpc/kvm/book3s_64_entry.S | 51 ++++++++++++++++++++++- 2 files changed, 50 insertions(+), 61 deletions(-) diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 162595af1ac7..16fbfde960e7 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -133,7 +133,6 @@ name: #define IBRANCH_TO_COMMON .L_IBRANCH_TO_COMMON_\name\() /* ENTRY branch to common */ #define IREALMODE_COMMON .L_IREALMODE_COMMON_\name\() /* Common runs in realmode */ #define IMASK .L_IMASK_\name\() /* IRQ soft-mask bit */ -#define IKVM_SKIP .L_IKVM_SKIP_\name\() /* Generate KVM skip handler */ #define IKVM_REAL .L_IKVM_REAL_\name\() /* Real entry tests KVM */ #define __IKVM_REAL(name) .L_IKVM_REAL_ ## name #define IKVM_VIRT .L_IKVM_VIRT_\name\() /* Virt entry tests KVM */ @@ -190,9 +189,6 @@ do_define_int n .ifndef IMASK IMASK=0 .endif - .ifndef IKVM_SKIP - IKVM_SKIP=0 - .endif .ifndef IKVM_REAL IKVM_REAL=0 .endif @@ -250,15 +246,10 @@ do_define_int n .balign IFETCH_ALIGN_BYTES \name\()_kvm: - .if IKVM_SKIP - cmpwi r10,KVM_GUEST_MODE_SKIP - beq 89f - .else BEGIN_FTR_SECTION ld r10,IAREA+EX_CFAR(r13) std r10,HSTATE_CFAR(r13) END_FTR_SECTION_IFSET(CPU_FTR_CFAR) - .endif ld r10,IAREA+EX_CTR(r13) mtctr r10 @@ -285,27 +276,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) ori r12,r12,(IVEC) .endif b kvmppc_interrupt - - .if IKVM_SKIP -89: mtocrf 0x80,r9 - ld r10,IAREA+EX_CTR(r13) - mtctr r10 - ld r9,IAREA+EX_R9(r13) - ld r10,IAREA+EX_R10(r13) - ld r11,IAREA+EX_R11(r13) - ld r12,IAREA+EX_R12(r13) - .if IHSRR_IF_HVMODE - BEGIN_FTR_SECTION - b kvmppc_skip_Hinterrupt - FTR_SECTION_ELSE - b kvmppc_skip_interrupt - ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) - .elseif IHSRR - b kvmppc_skip_Hinterrupt - .else - b kvmppc_skip_interrupt - .endif - .endif .endm #else @@ -1083,7 +1053,6 @@ INT_DEFINE_BEGIN(machine_check) ISET_RI=0 IDAR=1 IDSISR=1 - IKVM_SKIP=1 IKVM_REAL=1 INT_DEFINE_END(machine_check) @@ -1356,7 +1325,6 @@ INT_DEFINE_BEGIN(data_access) IVEC=0x300 IDAR=1 IDSISR=1 - IKVM_SKIP=1 IKVM_REAL=1 INT_DEFINE_END(data_access) @@ -1410,7 +1378,6 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) INT_DEFINE_BEGIN(data_access_slb) IVEC=0x380 IDAR=1 - IKVM_SKIP=1 IKVM_REAL=1 INT_DEFINE_END(data_access_slb) @@ -2080,7 +2047,6 @@ INT_DEFINE_BEGIN(h_data_storage) IHSRR=1 IDAR=1 IDSISR=1 - IKVM_SKIP=1 IKVM_REAL=1 IKVM_VIRT=1 INT_DEFINE_END(h_data_storage) @@ -3024,32 +2990,6 @@ EXPORT_SYMBOL(do_uaccess_flush) MASKED_INTERRUPT MASKED_INTERRUPT hsrr=1 -#ifdef CONFIG_KVM_BOOK3S_64_HANDLER -kvmppc_skip_interrupt: - /* - * Here all GPRs are unchanged from when the interrupt happened - * except for r13, which is saved in SPRG_SCRATCH0. - */ - mfspr r13, SPRN_SRR0 - addi r13, r13, 4 - mtspr SPRN_SRR0, r13 - GET_SCRATCH0(r13) - RFI_TO_KERNEL - b . - -kvmppc_skip_Hinterrupt: - /* - * Here all GPRs are unchanged from when the interrupt happened - * except for r13, which is saved in SPRG_SCRATCH0. - */ - mfspr r13, SPRN_HSRR0 - addi r13, r13, 4 - mtspr SPRN_HSRR0, r13 - GET_SCRATCH0(r13) - HRFI_TO_KERNEL - b . -#endif - /* * Relocation-on interrupts: A subset of the interrupts can be delivered * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering diff --git a/arch/powerpc/kvm/book3s_64_entry.S b/arch/powerpc/kvm/book3s_64_entry.S index 7a039ea78f15..a5412e24cc05 100644 --- a/arch/powerpc/kvm/book3s_64_entry.S +++ b/arch/powerpc/kvm/book3s_64_entry.S @@ -1,6 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0-only */ #include #include +#include #include #include #include @@ -20,9 +21,12 @@ kvmppc_interrupt: * guest R12 saved in shadow VCPU SCRATCH0 * guest R13 saved in SPRN_SCRATCH0 */ -#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE std r9,HSTATE_SCRATCH2(r13) lbz r9,HSTATE_IN_GUEST(r13) + cmpwi r9,KVM_GUEST_MODE_SKIP + beq- .Lmaybe_skip +.Lno_skip: +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE cmpwi r9,KVM_GUEST_MODE_HOST_HV beq kvmppc_bad_host_intr #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE @@ -34,3 +38,48 @@ kvmppc_interrupt: #else b kvmppc_interrupt_pr #endif + +/* + * KVM uses a trick where it is running in MSR[HV]=1 mode in real-mode with the + * guest MMU context loaded, and it sets KVM_GUEST_MODE_SKIP and enables + * MSR[DR]=1 while leaving MSR[IR]=0, so it continues to fetch HV instructions + * but loads and stores will access the guest context. This is used to load + * the faulting instruction without walking page tables. + * + * However the guest context may not be able to translate, or it may cause a + * machine check or other issue, which will result in a fault in the host + * (even with KVM-HV). + * + * These faults are caught here and if the fault was (or was likely) due to + * that load, then we just return with the PC advanced +4 and skip the load, + * which then goes to the slow path and walks the page tables. + */ +.Lmaybe_skip: + cmpwi r12,BOOK3S_INTERRUPT_MACHINE_CHECK + beq 1f + cmpwi r12,BOOK3S_INTERRUPT_DATA_STORAGE + beq 1f + cmpwi r12,BOOK3S_INTERRUPT_DATA_SEGMENT + beq 1f +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + /* HSRR interrupts have 2 added to trap vector */ + cmpwi r12,BOOK3S_INTERRUPT_H_DATA_STORAGE | 0x2 + beq 2f +#endif + b .Lno_skip +1: mfspr r9,SPRN_SRR0 + addi r9,r9,4 + mtspr SPRN_SRR0,r9 + ld r12,HSTATE_SCRATCH0(r13) + ld r9,HSTATE_SCRATCH2(r13) + GET_SCRATCH0(r13) + RFI_TO_KERNEL +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE +2: mfspr r9,SPRN_HSRR0 + addi r9,r9,4 + mtspr SPRN_HSRR0,r9 + ld r12,HSTATE_SCRATCH0(r13) + ld r9,HSTATE_SCRATCH2(r13) + GET_SCRATCH0(r13) + HRFI_TO_KERNEL +#endif