From patchwork Tue Mar 14 10:15:14 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: James Hogan X-Patchwork-Id: 9622917 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CDA8060244 for ; Tue, 14 Mar 2017 10:19:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B3E162856B for ; Tue, 14 Mar 2017 10:19:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A83E028573; Tue, 14 Mar 2017 10:19:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4C2532856B for ; Tue, 14 Mar 2017 10:19:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751179AbdCNKTh (ORCPT ); Tue, 14 Mar 2017 06:19:37 -0400 Received: from mailapp01.imgtec.com ([195.59.15.196]:6489 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750969AbdCNKSL (ORCPT ); Tue, 14 Mar 2017 06:18:11 -0400 Received: from hhmail02.hh.imgtec.org (unknown [10.100.10.20]) by Forcepoint Email with ESMTPS id 6BE817599AD80; Tue, 14 Mar 2017 10:18:05 +0000 (GMT) Received: from jhogan-linux.le.imgtec.org (192.168.154.110) by hhmail02.hh.imgtec.org (10.100.10.21) with Microsoft SMTP Server (TLS) id 14.3.294.0; Tue, 14 Mar 2017 10:18:08 +0000 From: James Hogan To: , CC: James Hogan , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Ralf Baechle , Andreas Herrmann , David Daney , Jonathan Corbet , Subject: [PATCH v2 7/33] KVM: MIPS: Implement HYPCALL emulation Date: Tue, 14 Mar 2017 10:15:14 +0000 Message-ID: <2306dc3161f82c86ee00eb0e421f3c956e2b1140.1489485940.git-series.james.hogan@imgtec.com> X-Mailer: git-send-email 2.11.1 MIME-Version: 1.0 In-Reply-To: References: X-Originating-IP: [192.168.154.110] Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Emulate the HYPCALL instruction added in the VZ ASE and used by the MIPS paravirtualised guest support that is already merged. The new hypcall.c handles arguments and the return value. No actual hypercalls are yet supported, but this still allows us to safely step over hypercalls and set an error code in the return value for forward compatibility. Non-zero HYPCALL codes are not handled. We also document the hypercall ABI which asm/kvm_para.h uses. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: Andreas Herrmann Cc: David Daney Cc: Jonathan Corbet Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: linux-doc@vger.kernel.org --- Changes in v2: - Patch 1 of hypercall series incorporated into VZ series --- Documentation/virtual/kvm/hypercalls.txt | 5 ++- arch/mips/include/asm/kvm_host.h | 7 +++- arch/mips/include/uapi/asm/inst.h | 2 +- arch/mips/kvm/Makefile | 1 +- arch/mips/kvm/emulate.c | 3 +- arch/mips/kvm/hypcall.c | 53 +++++++++++++++++++++++++- arch/mips/kvm/trap_emul.c | 4 ++- 7 files changed, 74 insertions(+), 1 deletion(-) create mode 100644 arch/mips/kvm/hypcall.c diff --git a/Documentation/virtual/kvm/hypercalls.txt b/Documentation/virtual/kvm/hypercalls.txt index feaaa634f154..a890529c63ed 100644 --- a/Documentation/virtual/kvm/hypercalls.txt +++ b/Documentation/virtual/kvm/hypercalls.txt @@ -28,6 +28,11 @@ S390: property inside the device tree's /hypervisor node. For more information refer to Documentation/virtual/kvm/ppc-pv.txt +MIPS: + KVM hypercalls use the HYPCALL instruction with code 0 and the hypercall + number in $2 (v0). Up to four arguments may be placed in $4-$7 (a0-a3) and + the return value is placed in $2 (v0). + KVM Hypercalls Documentation =========================== The template for each hypercall is: diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 05e785fc061d..0d308d4f2429 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -229,6 +229,7 @@ enum emulation_result { EMULATE_WAIT, /* WAIT instruction */ EMULATE_PRIV_FAIL, EMULATE_EXCEPT, /* A guest exception has been generated */ + EMULATE_HYPERCALL, /* HYPCALL instruction */ }; #define mips3_paddr_to_tlbpfn(x) \ @@ -832,6 +833,12 @@ unsigned int kvm_mips_config3_wrmask(struct kvm_vcpu *vcpu); unsigned int kvm_mips_config4_wrmask(struct kvm_vcpu *vcpu); unsigned int kvm_mips_config5_wrmask(struct kvm_vcpu *vcpu); +/* Hypercalls (hypcall.c) */ + +enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu, + union mips_instruction inst); +int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu); + /* Dynamic binary translation */ extern int kvm_mips_trans_cache_index(union mips_instruction inst, u32 *opc, struct kvm_vcpu *vcpu); diff --git a/arch/mips/include/uapi/asm/inst.h b/arch/mips/include/uapi/asm/inst.h index 77429d1622b3..b5e46ae872d3 100644 --- a/arch/mips/include/uapi/asm/inst.h +++ b/arch/mips/include/uapi/asm/inst.h @@ -179,7 +179,7 @@ enum cop0_coi_func { tlbr_op = 0x01, tlbwi_op = 0x02, tlbwr_op = 0x06, tlbp_op = 0x08, rfe_op = 0x10, eret_op = 0x18, - wait_op = 0x20, + wait_op = 0x20, hypcall_op = 0x28 }; /* diff --git a/arch/mips/kvm/Makefile b/arch/mips/kvm/Makefile index 847429de780d..e56403c8a3f5 100644 --- a/arch/mips/kvm/Makefile +++ b/arch/mips/kvm/Makefile @@ -10,6 +10,7 @@ common-objs-$(CONFIG_CPU_HAS_MSA) += msa.o kvm-objs := $(common-objs-y) mips.o emulate.o entry.o \ interrupt.o stats.o commpage.o \ dyntrans.o trap_emul.o fpu.o +kvm-objs += hypcall.o kvm-objs += mmu.o obj-$(CONFIG_KVM) += kvm.o diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c index d40cfaad4529..637753ea0a00 100644 --- a/arch/mips/kvm/emulate.c +++ b/arch/mips/kvm/emulate.c @@ -1143,6 +1143,9 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst, case wait_op: er = kvm_mips_emul_wait(vcpu); break; + case hypcall_op: + er = kvm_mips_emul_hypcall(vcpu, inst); + break; } } else { rt = inst.c0r_format.rt; diff --git a/arch/mips/kvm/hypcall.c b/arch/mips/kvm/hypcall.c new file mode 100644 index 000000000000..83063435195f --- /dev/null +++ b/arch/mips/kvm/hypcall.c @@ -0,0 +1,53 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * KVM/MIPS: Hypercall handling. + * + * Copyright (C) 2015 Imagination Technologies Ltd. + */ + +#include +#include +#include + +#define MAX_HYPCALL_ARGS 4 + +enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu, + union mips_instruction inst) +{ + unsigned int code = (inst.co_format.code >> 5) & 0x3ff; + + kvm_debug("[%#lx] HYPCALL %#03x\n", vcpu->arch.pc, code); + + switch (code) { + case 0: + return EMULATE_HYPERCALL; + default: + return EMULATE_FAIL; + }; +} + +static int kvm_mips_hypercall(struct kvm_vcpu *vcpu, unsigned long num, + const unsigned long *args, unsigned long *hret) +{ + /* Report unimplemented hypercall to guest */ + *hret = -KVM_ENOSYS; + return RESUME_GUEST; +} + +int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu) +{ + unsigned long num, args[MAX_HYPCALL_ARGS]; + + /* read hypcall number and arguments */ + num = vcpu->arch.gprs[2]; /* v0 */ + args[0] = vcpu->arch.gprs[4]; /* a0 */ + args[1] = vcpu->arch.gprs[5]; /* a1 */ + args[2] = vcpu->arch.gprs[6]; /* a2 */ + args[3] = vcpu->arch.gprs[7]; /* a3 */ + + return kvm_mips_hypercall(vcpu, num, + args, &vcpu->arch.gprs[2] /* v0 */); +} diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index b1fa53b252ea..3a854bb9e606 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -82,6 +82,10 @@ static int kvm_trap_emul_handle_cop_unusable(struct kvm_vcpu *vcpu) ret = RESUME_HOST; break; + case EMULATE_HYPERCALL: + ret = kvm_mips_handle_hypcall(vcpu); + break; + default: BUG(); }