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Mon, 29 Jul 2019 11:57:17 +0000 From: Anup Patel To: Palmer Dabbelt , Paul Walmsley , Paolo Bonzini , Radim K CC: Daniel Lezcano , Thomas Gleixner , Atish Patra , Alistair Francis , Damien Le Moal , Christoph Hellwig , Anup Patel , "kvm@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Anup Patel Subject: [RFC PATCH 09/16] RISC-V: KVM: Handle WFI exits for VCPU Thread-Topic: [RFC PATCH 09/16] RISC-V: KVM: Handle WFI exits for VCPU Thread-Index: AQHVRgTELJpWYbc670q25LJ6UKFygQ== Date: Mon, 29 Jul 2019 11:57:17 +0000 Message-ID: <20190729115544.17895-10-anup.patel@wdc.com> References: <20190729115544.17895-1-anup.patel@wdc.com> In-Reply-To: <20190729115544.17895-1-anup.patel@wdc.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: PN1PR01CA0116.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c00::32) To MN2PR04MB6061.namprd04.prod.outlook.com (2603:10b6:208:d8::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Anup.Patel@wdc.com; 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x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: P1a/H6Nxfd4zCZqMFJq7IZRe/8F4yfC4WY68eLGMJufeSkqKPiPsRgeQ1s7WgKnJ1w22O+etvu90JH5+IaO7keH6TFgDWEKMlPu28bppizLnHgoPlEKXrXudz/pVSM303b0kmSL2FIQWOyflBEpDXeQieISeMR3Z4mh2mAR5Wt6ZgAdiRq+WWkgm/P2pmUlFi8wp5WNn8z1ev1jv0CQbSLS6S5k8yveY1lYhpx5w12RmpyhFLsqHnuxTiN2X+wQeptTINmz9VNBauyWDnQxXQYhtBIlVSiSqti5v9L0lbwgA6nRfbEGU63MWUHNzP4TxT4RyzR6x80vXbeqoi7NLZeCfninD49TbxULedhL+7uPMOBaBmPDJEIUChfrXfiYOAClSLU+tfRjxfujCxQ8XQHiBv1TOJjcIFZOek127uPI= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9f7472b8-62fe-49a5-75aa-08d7141be738 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Jul 2019 11:57:17.4352 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Anup.Patel@wdc.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB5952 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We get illegal instruction trap whenever Guest/VM executes WFI instruction. This patch handles WFI trap by blocking the trapped VCPU using kvm_vcpu_block() API. The blocked VCPU will be automatically resumed whenever a VCPU interrupt is injected from user-space or from in-kernel IRQCHIP emulation. Signed-off-by: Anup Patel --- arch/riscv/kvm/vcpu_exit.c | 86 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c index 4dafefa59338..2d09640c98b2 100644 --- a/arch/riscv/kvm/vcpu_exit.c +++ b/arch/riscv/kvm/vcpu_exit.c @@ -12,6 +12,9 @@ #include #include =20 +#define INSN_MASK_WFI 0xffffff00 +#define INSN_MATCH_WFI 0x10500000 + #define INSN_MATCH_LB 0x3 #define INSN_MASK_LB 0x707f #define INSN_MATCH_LH 0x1003 @@ -178,6 +181,85 @@ static ulong get_insn(struct kvm_vcpu *vcpu) return val; } =20 +typedef int (*illegal_insn_func)(struct kvm_vcpu *vcpu, + struct kvm_run *run, + ulong insn); + +static int truly_illegal_insn(struct kvm_vcpu *vcpu, + struct kvm_run *run, + ulong insn) +{ + /* TODO: Redirect trap to Guest VCPU */ + return -ENOTSUPP; +} + +static int system_opcode_insn(struct kvm_vcpu *vcpu, + struct kvm_run *run, + ulong insn) +{ + if ((insn & INSN_MASK_WFI) =3D=3D INSN_MATCH_WFI) { + vcpu->stat.wfi_exit_stat++; + if (!kvm_riscv_vcpu_has_interrupt(vcpu)) { + kvm_vcpu_block(vcpu); + kvm_clear_request(KVM_REQ_UNHALT, vcpu); + } + vcpu->arch.guest_context.sepc +=3D INSN_LEN(insn); + return 1; + } + + return truly_illegal_insn(vcpu, run, insn); +} + +static illegal_insn_func illegal_insn_table[32] =3D { + truly_illegal_insn, /* 0 */ + truly_illegal_insn, /* 1 */ + truly_illegal_insn, /* 2 */ + truly_illegal_insn, /* 3 */ + truly_illegal_insn, /* 4 */ + truly_illegal_insn, /* 5 */ + truly_illegal_insn, /* 6 */ + truly_illegal_insn, /* 7 */ + truly_illegal_insn, /* 8 */ + truly_illegal_insn, /* 9 */ + truly_illegal_insn, /* 10 */ + truly_illegal_insn, /* 11 */ + truly_illegal_insn, /* 12 */ + truly_illegal_insn, /* 13 */ + truly_illegal_insn, /* 14 */ + truly_illegal_insn, /* 15 */ + truly_illegal_insn, /* 16 */ + truly_illegal_insn, /* 17 */ + truly_illegal_insn, /* 18 */ + truly_illegal_insn, /* 19 */ + truly_illegal_insn, /* 20 */ + truly_illegal_insn, /* 21 */ + truly_illegal_insn, /* 22 */ + truly_illegal_insn, /* 23 */ + truly_illegal_insn, /* 24 */ + truly_illegal_insn, /* 25 */ + truly_illegal_insn, /* 26 */ + truly_illegal_insn, /* 27 */ + system_opcode_insn, /* 28 */ + truly_illegal_insn, /* 29 */ + truly_illegal_insn, /* 30 */ + truly_illegal_insn /* 31 */ +}; + +static int illegal_inst_fault(struct kvm_vcpu *vcpu, struct kvm_run *run, + unsigned long stval) +{ + ulong insn =3D stval; + + if (unlikely((insn & 3) !=3D 3)) { + if (insn =3D=3D 0) + insn =3D get_insn(vcpu); + if ((insn & 3) !=3D 3) + return truly_illegal_insn(vcpu, run, insn); + } + + return illegal_insn_table[(insn & 0x7c) >> 2](vcpu, run, insn); +} + static int emulate_load(struct kvm_vcpu *vcpu, struct kvm_run *run, unsigned long fault_addr) { @@ -438,6 +520,10 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct = kvm_run *run, ret =3D -EFAULT; run->exit_reason =3D KVM_EXIT_UNKNOWN; switch (scause) { + case EXC_INST_ILLEGAL: + if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV) + ret =3D illegal_inst_fault(vcpu, run, stval); + break; case EXC_INST_PAGE_FAULT: case EXC_LOAD_PAGE_FAULT: case EXC_STORE_PAGE_FAULT: --=20 2.17.1