From 258f3a2ea93ff7e322006c716cedc4fa3d861453 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Wed, 15 Jun 2016 19:29:47 +0100 Subject: [PATCH] MIPS: KVM: Convert emulation to use asm/inst.h MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Convert various MIPS KVM guest instruction emulation functions to decode instructions (and encode translations) using the union mips_instruction and related enumerations in asm/inst.h rather than #defines and hardcoded values. Signed-off-by: James Hogan Acked-by: Ralf Baechle Cc: Paolo Bonzini Cc: Radim Krčmář Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini --- arch/mips/include/asm/kvm_host.h | 22 +++--- arch/mips/include/uapi/asm/inst.h | 35 +++++++++- arch/mips/kvm/dyntrans.c | 74 ++++++++++---------- arch/mips/kvm/emulate.c | 109 ++++++++++++------------------ 4 files changed, 126 insertions(+), 114 deletions(-) diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index b8cb74270746..1e002136f514 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -19,6 +19,7 @@ #include #include +#include #include /* MIPS KVM register ids */ @@ -733,21 +734,21 @@ enum emulation_result kvm_mips_check_privilege(u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu); -enum emulation_result kvm_mips_emulate_cache(u32 inst, +enum emulation_result kvm_mips_emulate_cache(union mips_instruction inst, u32 *opc, u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu); -enum emulation_result kvm_mips_emulate_CP0(u32 inst, +enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst, u32 *opc, u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu); -enum emulation_result kvm_mips_emulate_store(u32 inst, +enum emulation_result kvm_mips_emulate_store(union mips_instruction inst, u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu); -enum emulation_result kvm_mips_emulate_load(u32 inst, +enum emulation_result kvm_mips_emulate_load(union mips_instruction inst, u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu); @@ -758,11 +759,14 @@ unsigned int kvm_mips_config4_wrmask(struct kvm_vcpu *vcpu); unsigned int kvm_mips_config5_wrmask(struct kvm_vcpu *vcpu); /* Dynamic binary translation */ -extern int kvm_mips_trans_cache_index(u32 inst, u32 *opc, - struct kvm_vcpu *vcpu); -extern int kvm_mips_trans_cache_va(u32 inst, u32 *opc, struct kvm_vcpu *vcpu); -extern int kvm_mips_trans_mfc0(u32 inst, u32 *opc, struct kvm_vcpu *vcpu); -extern int kvm_mips_trans_mtc0(u32 inst, u32 *opc, struct kvm_vcpu *vcpu); +extern int kvm_mips_trans_cache_index(union mips_instruction inst, + u32 *opc, struct kvm_vcpu *vcpu); +extern int kvm_mips_trans_cache_va(union mips_instruction inst, u32 *opc, + struct kvm_vcpu *vcpu); +extern int kvm_mips_trans_mfc0(union mips_instruction inst, u32 *opc, + struct kvm_vcpu *vcpu); +extern int kvm_mips_trans_mtc0(union mips_instruction inst, u32 *opc, + struct kvm_vcpu *vcpu); /* Misc */ extern void kvm_mips_dump_stats(struct kvm_vcpu *vcpu); diff --git a/arch/mips/include/uapi/asm/inst.h b/arch/mips/include/uapi/asm/inst.h index 8051f9aa1379..a1ebf973725c 100644 --- a/arch/mips/include/uapi/asm/inst.h +++ b/arch/mips/include/uapi/asm/inst.h @@ -103,7 +103,7 @@ enum rt_op { bltzal_op, bgezal_op, bltzall_op, bgezall_op, rt_op_0x14, rt_op_0x15, rt_op_0x16, rt_op_0x17, rt_op_0x18, rt_op_0x19, rt_op_0x1a, rt_op_0x1b, - bposge32_op, rt_op_0x1d, rt_op_0x1e, rt_op_0x1f + bposge32_op, rt_op_0x1d, rt_op_0x1e, synci_op }; /* @@ -586,6 +586,36 @@ struct r_format { /* Register format */ ;)))))) }; +struct c0r_format { /* C0 register format */ + __BITFIELD_FIELD(unsigned int opcode : 6, + __BITFIELD_FIELD(unsigned int rs : 5, + __BITFIELD_FIELD(unsigned int rt : 5, + __BITFIELD_FIELD(unsigned int rd : 5, + __BITFIELD_FIELD(unsigned int z: 8, + __BITFIELD_FIELD(unsigned int sel : 3, + ;)))))) +}; + +struct mfmc0_format { /* MFMC0 register format */ + __BITFIELD_FIELD(unsigned int opcode : 6, + __BITFIELD_FIELD(unsigned int rs : 5, + __BITFIELD_FIELD(unsigned int rt : 5, + __BITFIELD_FIELD(unsigned int rd : 5, + __BITFIELD_FIELD(unsigned int re : 5, + __BITFIELD_FIELD(unsigned int sc : 1, + __BITFIELD_FIELD(unsigned int : 2, + __BITFIELD_FIELD(unsigned int sel : 3, + ;)))))))) +}; + +struct co_format { /* C0 CO format */ + __BITFIELD_FIELD(unsigned int opcode : 6, + __BITFIELD_FIELD(unsigned int co : 1, + __BITFIELD_FIELD(unsigned int code : 19, + __BITFIELD_FIELD(unsigned int func : 6, + ;)))) +}; + struct p_format { /* Performance counter format (R10000) */ __BITFIELD_FIELD(unsigned int opcode : 6, __BITFIELD_FIELD(unsigned int rs : 5, @@ -937,6 +967,9 @@ union mips_instruction { struct u_format u_format; struct c_format c_format; struct r_format r_format; + struct c0r_format c0r_format; + struct mfmc0_format mfmc0_format; + struct co_format co_format; struct p_format p_format; struct f_format f_format; struct ma_format ma_format; diff --git a/arch/mips/kvm/dyntrans.c b/arch/mips/kvm/dyntrans.c index eb6e0d17a668..a3031dae8d1b 100644 --- a/arch/mips/kvm/dyntrans.c +++ b/arch/mips/kvm/dyntrans.c @@ -20,21 +20,14 @@ #include "commpage.h" -#define SYNCI_TEMPLATE 0x041f0000 -#define SYNCI_BASE(x) (((x) >> 21) & 0x1f) -#define SYNCI_OFFSET ((x) & 0xffff) - -#define LW_TEMPLATE 0x8c000000 -#define CLEAR_TEMPLATE 0x00000020 -#define SW_TEMPLATE 0xac000000 - /** * kvm_mips_trans_replace() - Replace trapping instruction in guest memory. * @vcpu: Virtual CPU. * @opc: PC of instruction to replace. * @replace: Instruction to write */ -static int kvm_mips_trans_replace(struct kvm_vcpu *vcpu, u32 *opc, u32 replace) +static int kvm_mips_trans_replace(struct kvm_vcpu *vcpu, u32 *opc, + union mips_instruction replace) { unsigned long kseg0_opc, flags; @@ -58,63 +51,68 @@ static int kvm_mips_trans_replace(struct kvm_vcpu *vcpu, u32 *opc, u32 replace) return 0; } -int kvm_mips_trans_cache_index(u32 inst, u32 *opc, +int kvm_mips_trans_cache_index(union mips_instruction inst, u32 *opc, struct kvm_vcpu *vcpu) { + union mips_instruction nop_inst = { 0 }; + /* Replace the CACHE instruction, with a NOP */ - return kvm_mips_trans_replace(vcpu, opc, 0x00000000); + return kvm_mips_trans_replace(vcpu, opc, nop_inst); } /* * Address based CACHE instructions are transformed into synci(s). A little * heavy for just D-cache invalidates, but avoids an expensive trap */ -int kvm_mips_trans_cache_va(u32 inst, u32 *opc, +int kvm_mips_trans_cache_va(union mips_instruction inst, u32 *opc, struct kvm_vcpu *vcpu) { - u32 synci_inst = SYNCI_TEMPLATE, base, offset; + union mips_instruction synci_inst = { 0 }; - base = (inst >> 21) & 0x1f; - offset = inst & 0xffff; - synci_inst |= (base << 21); - synci_inst |= offset; + synci_inst.i_format.opcode = bcond_op; + synci_inst.i_format.rs = inst.i_format.rs; + synci_inst.i_format.rt = synci_op; + synci_inst.i_format.simmediate = inst.i_format.simmediate; return kvm_mips_trans_replace(vcpu, opc, synci_inst); } -int kvm_mips_trans_mfc0(u32 inst, u32 *opc, struct kvm_vcpu *vcpu) +int kvm_mips_trans_mfc0(union mips_instruction inst, u32 *opc, + struct kvm_vcpu *vcpu) { - u32 rt, rd, sel; - u32 mfc0_inst; + union mips_instruction mfc0_inst = { 0 }; + u32 rd, sel; - rt = (inst >> 16) & 0x1f; - rd = (inst >> 11) & 0x1f; - sel = inst & 0x7; + rd = inst.c0r_format.rd; + sel = inst.c0r_format.sel; - if ((rd == MIPS_CP0_ERRCTL) && (sel == 0)) { - mfc0_inst = CLEAR_TEMPLATE; - mfc0_inst |= ((rt & 0x1f) << 11); + if (rd == MIPS_CP0_ERRCTL && sel == 0) { + mfc0_inst.r_format.opcode = spec_op; + mfc0_inst.r_format.rd = inst.c0r_format.rt; + mfc0_inst.r_format.func = add_op; } else { - mfc0_inst = LW_TEMPLATE; - mfc0_inst |= ((rt & 0x1f) << 16); - mfc0_inst |= offsetof(struct kvm_mips_commpage, - cop0.reg[rd][sel]); + mfc0_inst.i_format.opcode = lw_op; + mfc0_inst.i_format.rt = inst.c0r_format.rt; + mfc0_inst.i_format.simmediate = + offsetof(struct kvm_mips_commpage, cop0.reg[rd][sel]); } return kvm_mips_trans_replace(vcpu, opc, mfc0_inst); } -int kvm_mips_trans_mtc0(u32 inst, u32 *opc, struct kvm_vcpu *vcpu) +int kvm_mips_trans_mtc0(union mips_instruction inst, u32 *opc, + struct kvm_vcpu *vcpu) { - u32 rt, rd, sel; - u32 mtc0_inst = SW_TEMPLATE; + union mips_instruction mtc0_inst = { 0 }; + u32 rd, sel; - rt = (inst >> 16) & 0x1f; - rd = (inst >> 11) & 0x1f; - sel = inst & 0x7; + rd = inst.c0r_format.rd; + sel = inst.c0r_format.sel; - mtc0_inst |= ((rt & 0x1f) << 16); - mtc0_inst |= offsetof(struct kvm_mips_commpage, cop0.reg[rd][sel]); + mtc0_inst.i_format.opcode = sw_op; + mtc0_inst.i_format.rt = inst.c0r_format.rt; + mtc0_inst.i_format.simmediate = + offsetof(struct kvm_mips_commpage, cop0.reg[rd][sel]); return kvm_mips_trans_replace(vcpu, opc, mtc0_inst); } diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c index ff4072c2b25e..80bb6212a067 100644 --- a/arch/mips/kvm/emulate.c +++ b/arch/mips/kvm/emulate.c @@ -972,13 +972,14 @@ unsigned int kvm_mips_config5_wrmask(struct kvm_vcpu *vcpu) return mask; } -enum emulation_result kvm_mips_emulate_CP0(u32 inst, u32 *opc, u32 cause, +enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst, + u32 *opc, u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu) { struct mips_coproc *cop0 = vcpu->arch.cop0; enum emulation_result er = EMULATE_DONE; - u32 rt, rd, copz, sel, co_bit, op; + u32 rt, rd, sel; unsigned long curr_pc; /* @@ -990,16 +991,8 @@ enum emulation_result kvm_mips_emulate_CP0(u32 inst, u32 *opc, u32 cause, if (er == EMULATE_FAIL) return er; - copz = (inst >> 21) & 0x1f; - rt = (inst >> 16) & 0x1f; - rd = (inst >> 11) & 0x1f; - sel = inst & 0x7; - co_bit = (inst >> 25) & 1; - - if (co_bit) { - op = (inst) & 0xff; - - switch (op) { + if (inst.co_format.co) { + switch (inst.co_format.func) { case tlbr_op: /* Read indexed TLB entry */ er = kvm_mips_emul_tlbr(vcpu); break; @@ -1018,13 +1011,16 @@ enum emulation_result kvm_mips_emulate_CP0(u32 inst, u32 *opc, u32 cause, case eret_op: er = kvm_mips_emul_eret(vcpu); goto dont_update_pc; - break; case wait_op: er = kvm_mips_emul_wait(vcpu); break; } } else { - switch (copz) { + rt = inst.c0r_format.rt; + rd = inst.c0r_format.rd; + sel = inst.c0r_format.sel; + + switch (inst.c0r_format.rs) { case mfc_op: #ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS cop0->stat[rd][sel]++; @@ -1258,7 +1254,7 @@ enum emulation_result kvm_mips_emulate_CP0(u32 inst, u32 *opc, u32 cause, vcpu->arch.gprs[rt] = kvm_read_c0_guest_status(cop0); /* EI */ - if (inst & 0x20) { + if (inst.mfmc0_format.sc) { kvm_debug("[%#lx] mfmc0_op: EI\n", vcpu->arch.pc); kvm_set_c0_guest_status(cop0, ST0_IE); @@ -1290,7 +1286,7 @@ enum emulation_result kvm_mips_emulate_CP0(u32 inst, u32 *opc, u32 cause, break; default: kvm_err("[%#lx]MachEmulateCP0: unsupported COP0, copz: 0x%x\n", - vcpu->arch.pc, copz); + vcpu->arch.pc, inst.c0r_format.rs); er = EMULATE_FAIL; break; } @@ -1311,13 +1307,13 @@ dont_update_pc: return er; } -enum emulation_result kvm_mips_emulate_store(u32 inst, u32 cause, +enum emulation_result kvm_mips_emulate_store(union mips_instruction inst, + u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DO_MMIO; - u32 op, base, rt; - s16 offset; + u32 rt; u32 bytes; void *data = run->mmio.data; unsigned long curr_pc; @@ -1331,12 +1327,9 @@ enum emulation_result kvm_mips_emulate_store(u32 inst, u32 cause, if (er == EMULATE_FAIL) return er; - rt = (inst >> 16) & 0x1f; - base = (inst >> 21) & 0x1f; - offset = (s16)inst; - op = (inst >> 26) & 0x3f; + rt = inst.i_format.rt; - switch (op) { + switch (inst.i_format.opcode) { case sb_op: bytes = 1; if (bytes > sizeof(run->mmio.data)) { @@ -1413,7 +1406,7 @@ enum emulation_result kvm_mips_emulate_store(u32 inst, u32 cause, default: kvm_err("Store not yet supported (inst=0x%08x)\n", - inst); + inst.word); er = EMULATE_FAIL; break; } @@ -1425,19 +1418,16 @@ enum emulation_result kvm_mips_emulate_store(u32 inst, u32 cause, return er; } -enum emulation_result kvm_mips_emulate_load(u32 inst, u32 cause, - struct kvm_run *run, +enum emulation_result kvm_mips_emulate_load(union mips_instruction inst, + u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DO_MMIO; - u32 op, base, rt; - s16 offset; + u32 op, rt; u32 bytes; - rt = (inst >> 16) & 0x1f; - base = (inst >> 21) & 0x1f; - offset = (s16)inst; - op = (inst >> 26) & 0x3f; + rt = inst.i_format.rt; + op = inst.i_format.opcode; vcpu->arch.pending_load_cause = cause; vcpu->arch.io_gpr = rt; @@ -1524,7 +1514,7 @@ enum emulation_result kvm_mips_emulate_load(u32 inst, u32 cause, default: kvm_err("Load not yet supported (inst=0x%08x)\n", - inst); + inst.word); er = EMULATE_FAIL; break; } @@ -1532,8 +1522,8 @@ enum emulation_result kvm_mips_emulate_load(u32 inst, u32 cause, return er; } -enum emulation_result kvm_mips_emulate_cache(u32 inst, u32 *opc, - u32 cause, +enum emulation_result kvm_mips_emulate_cache(union mips_instruction inst, + u32 *opc, u32 cause, struct kvm_run *run, struct kvm_vcpu *vcpu) { @@ -1554,9 +1544,9 @@ enum emulation_result kvm_mips_emulate_cache(u32 inst, u32 *opc, if (er == EMULATE_FAIL) return er; - base = (inst >> 21) & 0x1f; - op_inst = (inst >> 16) & 0x1f; - offset = (s16)inst; + base = inst.i_format.rs; + op_inst = inst.i_format.rt; + offset = inst.i_format.simmediate; cache = op_inst & CacheOp_Cache; op = op_inst & CacheOp_Op; @@ -1693,16 +1683,16 @@ enum emulation_result kvm_mips_emulate_inst(u32 cause, u32 *opc, struct kvm_run *run, struct kvm_vcpu *vcpu) { + union mips_instruction inst; enum emulation_result er = EMULATE_DONE; - u32 inst; /* Fetch the instruction. */ if (cause & CAUSEF_BD) opc += 1; - inst = kvm_get_inst(opc, vcpu); + inst.word = kvm_get_inst(opc, vcpu); - switch (((union mips_instruction)inst).r_format.opcode) { + switch (inst.r_format.opcode) { case cop0_op: er = kvm_mips_emulate_CP0(inst, opc, cause, run, vcpu); break; @@ -1727,7 +1717,7 @@ enum emulation_result kvm_mips_emulate_inst(u32 cause, u32 *opc, default: kvm_err("Instruction emulation not supported (%p/%#x)\n", opc, - inst); + inst.word); kvm_arch_vcpu_dump_regs(vcpu); er = EMULATE_FAIL; break; @@ -2262,21 +2252,6 @@ enum emulation_result kvm_mips_emulate_msadis_exc(u32 cause, return er; } -/* ll/sc, rdhwr, sync emulation */ - -#define OPCODE 0xfc000000 -#define BASE 0x03e00000 -#define RT 0x001f0000 -#define OFFSET 0x0000ffff -#define LL 0xc0000000 -#define SC 0xe0000000 -#define SPEC0 0x00000000 -#define SPEC3 0x7c000000 -#define RD 0x0000f800 -#define FUNC 0x0000003f -#define SYNC 0x0000000f -#define RDHWR 0x0000003b - enum emulation_result kvm_mips_handle_ri(u32 cause, u32 *opc, struct kvm_run *run, struct kvm_vcpu *vcpu) @@ -2285,7 +2260,7 @@ enum emulation_result kvm_mips_handle_ri(u32 cause, u32 *opc, struct kvm_vcpu_arch *arch = &vcpu->arch; enum emulation_result er = EMULATE_DONE; unsigned long curr_pc; - u32 inst; + union mips_instruction inst; /* * Update PC and hold onto current PC in case there is @@ -2300,18 +2275,19 @@ enum emulation_result kvm_mips_handle_ri(u32 cause, u32 *opc, if (cause & CAUSEF_BD) opc += 1; - inst = kvm_get_inst(opc, vcpu); + inst.word = kvm_get_inst(opc, vcpu); - if (inst == KVM_INVALID_INST) { + if (inst.word == KVM_INVALID_INST) { kvm_err("%s: Cannot get inst @ %p\n", __func__, opc); return EMULATE_FAIL; } - if ((inst & OPCODE) == SPEC3 && (inst & FUNC) == RDHWR) { + if (inst.r_format.opcode == spec3_op && + inst.r_format.func == rdhwr_op) { int usermode = !KVM_GUEST_KERNEL_MODE(vcpu); - int rd = (inst & RD) >> 11; - int rt = (inst & RT) >> 16; - int sel = (inst >> 6) & 0x7; + int rd = inst.r_format.rd; + int rt = inst.r_format.rt; + int sel = inst.r_format.re & 0x7; /* If usermode, check RDHWR rd is allowed by guest HWREna */ if (usermode && !(kvm_read_c0_guest_hwrena(cop0) & BIT(rd))) { @@ -2352,7 +2328,8 @@ enum emulation_result kvm_mips_handle_ri(u32 cause, u32 *opc, trace_kvm_hwr(vcpu, KVM_TRACE_RDHWR, KVM_TRACE_HWR(rd, sel), vcpu->arch.gprs[rt]); } else { - kvm_debug("Emulate RI not supported @ %p: %#x\n", opc, inst); + kvm_debug("Emulate RI not supported @ %p: %#x\n", + opc, inst.word); goto emulate_ri; }