Commit 70923603 authored by Simon Guo's avatar Simon Guo Committed by Paul Mackerras
Browse files

KVM: PPC: Reimplement non-SIMD LOAD/STORE instruction mmio emulation with analyse_instr() input 



This patch reimplements non-SIMD LOAD/STORE instruction MMIO emulation
with analyse_instr() input. It utilizes the BYTEREV/UPDATE/SIGNEXT
properties exported by analyse_instr() and invokes
kvmppc_handle_load(s)/kvmppc_handle_store() accordingly.

It also moves CACHEOP type handling into the skeleton.

instruction_type within kvm_ppc.h is renamed to avoid conflict with
sstep.h.

Suggested-by: default avatarPaul Mackerras <paulus@ozlabs.org>
Signed-off-by: default avatarSimon Guo <wei.guo.simon@gmail.com>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent 94dd7fa1

arch/powerpc/include/asm/kvm_ppc.h

+3 −3
Original line number Diff line number Diff line
@@ -52,7 +52,7 @@ enum emulation_result { 
	EMULATE_EXIT_USER,    /* emulation requires exit to user-space */

};



enum instruction_type {

enum instruction_fetch_type {

	INST_GENERIC,

	INST_SC,		/* system call */

};
@@ -93,7 +93,7 @@ extern int kvmppc_handle_vsx_store(struct kvm_run *run, struct kvm_vcpu *vcpu, 
				int is_default_endian);



extern int kvmppc_load_last_inst(struct kvm_vcpu *vcpu,

				 enum instruction_type type, u32 *inst);

				 enum instruction_fetch_type type, u32 *inst);



extern int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,

		     bool data);
@@ -330,7 +330,7 @@ extern struct kvmppc_ops *kvmppc_hv_ops; 
extern struct kvmppc_ops *kvmppc_pr_ops;



static inline int kvmppc_get_last_inst(struct kvm_vcpu *vcpu,

					enum instruction_type type, u32 *inst)

				enum instruction_fetch_type type, u32 *inst)

{

	int ret = EMULATE_DONE;

	u32 fetched_inst;

arch/powerpc/kvm/book3s.c

+2 −2
Original line number Diff line number Diff line
@@ -450,8 +450,8 @@ int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, enum xlate_instdata xlid, 
	return r;

}



int kvmppc_load_last_inst(struct kvm_vcpu *vcpu, enum instruction_type type,

					 u32 *inst)

int kvmppc_load_last_inst(struct kvm_vcpu *vcpu,

		enum instruction_fetch_type type, u32 *inst)

{

	ulong pc = kvmppc_get_pc(vcpu);

	int r;

arch/powerpc/kvm/e500_mmu_host.c

+4 −4
Original line number Diff line number Diff line
@@ -625,8 +625,8 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr, 
}



#ifdef CONFIG_KVM_BOOKE_HV

int kvmppc_load_last_inst(struct kvm_vcpu *vcpu, enum instruction_type type,

			  u32 *instr)

int kvmppc_load_last_inst(struct kvm_vcpu *vcpu,

		enum instruction_fetch_type type, u32 *instr)

{

	gva_t geaddr;

	hpa_t addr;
@@ -715,8 +715,8 @@ int kvmppc_load_last_inst(struct kvm_vcpu *vcpu, enum instruction_type type, 
	return EMULATE_DONE;

}

#else

int kvmppc_load_last_inst(struct kvm_vcpu *vcpu, enum instruction_type type,

			  u32 *instr)

int kvmppc_load_last_inst(struct kvm_vcpu *vcpu,

		enum instruction_fetch_type type, u32 *instr)

{

	return EMULATE_AGAIN;

}

arch/powerpc/kvm/emulate_loadstore.c

+42 −229
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <asm/kvm_ppc.h>

#include <asm/disassemble.h>

#include <asm/ppc-opcode.h>

#include <asm/sstep.h>

#include "timing.h"

#include "trace.h"
@@ -84,8 +85,9 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu) 
	struct kvm_run *run = vcpu->run;

	u32 inst;

	int ra, rs, rt;

	enum emulation_result emulated;

	enum emulation_result emulated = EMULATE_FAIL;

	int advance = 1;

	struct instruction_op op;



	/* this default type might be overwritten by subcategories */

	kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
@@ -113,144 +115,61 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu) 
	vcpu->arch.mmio_vmx_copy_nums = 0;

	vcpu->arch.mmio_host_swabbed = 0;



	switch (get_op(inst)) {

	case 31:

		switch (get_xop(inst)) {

		case OP_31_XOP_LWZX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);

			break;



		case OP_31_XOP_LWZUX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;



		case OP_31_XOP_LBZX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);

			break;



		case OP_31_XOP_LBZUX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;



		case OP_31_XOP_STDX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 8, 1);

			break;



		case OP_31_XOP_STDUX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 8, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;



		case OP_31_XOP_STWX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 4, 1);

			break;



		case OP_31_XOP_STWUX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 4, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;



		case OP_31_XOP_STBX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 1, 1);

			break;



		case OP_31_XOP_STBUX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 1, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;

	emulated = EMULATE_FAIL;

	vcpu->arch.regs.msr = vcpu->arch.shared->msr;

	vcpu->arch.regs.ccr = vcpu->arch.cr;

	if (analyse_instr(&op, &vcpu->arch.regs, inst) == 0) {

		int type = op.type & INSTR_TYPE_MASK;

		int size = GETSIZE(op.type);



		case OP_31_XOP_LHAX:

			emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);

			break;

		switch (type) {

		case LOAD:  {

			int instr_byte_swap = op.type & BYTEREV;



		case OP_31_XOP_LHAUX:

			emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;

			if (op.type & SIGNEXT)

				emulated = kvmppc_handle_loads(run, vcpu,

						op.reg, size, !instr_byte_swap);

			else

				emulated = kvmppc_handle_load(run, vcpu,

						op.reg, size, !instr_byte_swap);



		case OP_31_XOP_LHZX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);

			break;

			if ((op.type & UPDATE) && (emulated != EMULATE_FAIL))

				kvmppc_set_gpr(vcpu, op.update_reg, op.ea);



		case OP_31_XOP_LHZUX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;

		}

		case STORE:

			/* if need byte reverse, op.val has been reversed by

			 * analyse_instr().

			 */

			emulated = kvmppc_handle_store(run, vcpu, op.val,

					size, 1);



		case OP_31_XOP_STHX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 2, 1);

			break;

			if ((op.type & UPDATE) && (emulated != EMULATE_FAIL))

				kvmppc_set_gpr(vcpu, op.update_reg, op.ea);



		case OP_31_XOP_STHUX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 2, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;



		case OP_31_XOP_DCBST:

		case OP_31_XOP_DCBF:

		case OP_31_XOP_DCBI:

		case CACHEOP:

			/* Do nothing. The guest is performing dcbi because

			 * hardware DMA is not snooped by the dcache, but

			 * emulated DMA either goes through the dcache as

			 * normal writes, or the host kernel has handled dcache

			 * coherence. */

			break;



		case OP_31_XOP_LWBRX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);

			break;



		case OP_31_XOP_STWBRX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 4, 0);

			break;



		case OP_31_XOP_LHBRX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);

			break;



		case OP_31_XOP_STHBRX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 2, 0);

			break;



		case OP_31_XOP_LDBRX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 8, 0);

			break;



		case OP_31_XOP_STDBRX:

			emulated = kvmppc_handle_store(run, vcpu,

					kvmppc_get_gpr(vcpu, rs), 8, 0);

			break;



		case OP_31_XOP_LDX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);

			 * coherence.

			 */

			emulated = EMULATE_DONE;

			break;



		case OP_31_XOP_LDUX:

			emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		default:

			break;

		}

	}



		case OP_31_XOP_LWAX:

			emulated = kvmppc_handle_loads(run, vcpu, rt, 4, 1);

			break;



		case OP_31_XOP_LWAUX:

			emulated = kvmppc_handle_loads(run, vcpu, rt, 4, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;

	if ((emulated == EMULATE_DONE) || (emulated == EMULATE_DO_MMIO))

		goto out;



	switch (get_op(inst)) {

	case 31:

		switch (get_xop(inst)) {

#ifdef CONFIG_PPC_FPU

		case OP_31_XOP_LFSX:

			if (kvmppc_check_fp_disabled(vcpu))
@@ -502,10 +421,6 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu) 
		}

		break;



	case OP_LWZ:

		emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);

		break;



#ifdef CONFIG_PPC_FPU

	case OP_STFS:

		if (kvmppc_check_fp_disabled(vcpu))
@@ -542,110 +457,7 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu) 
	                               8, 1);

		kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		break;

#endif



	case OP_LD:

		rt = get_rt(inst);

		switch (inst & 3) {

		case 0:	/* ld */

			emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);

			break;

		case 1: /* ldu */

			emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;

		case 2:	/* lwa */

			emulated = kvmppc_handle_loads(run, vcpu, rt, 4, 1);

			break;

		default:

			emulated = EMULATE_FAIL;

		}

		break;



	case OP_LWZU:

		emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);

		kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		break;



	case OP_LBZ:

		emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);

		break;



	case OP_LBZU:

		emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);

		kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		break;



	case OP_STW:

		emulated = kvmppc_handle_store(run, vcpu,

					       kvmppc_get_gpr(vcpu, rs),

		                               4, 1);

		break;



	case OP_STD:

		rs = get_rs(inst);

		switch (inst & 3) {

		case 0:	/* std */

			emulated = kvmppc_handle_store(run, vcpu,

				kvmppc_get_gpr(vcpu, rs), 8, 1);

			break;

		case 1: /* stdu */

			emulated = kvmppc_handle_store(run, vcpu,

				kvmppc_get_gpr(vcpu, rs), 8, 1);

			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

			break;

		default:

			emulated = EMULATE_FAIL;

		}

		break;



	case OP_STWU:

		emulated = kvmppc_handle_store(run, vcpu,

				kvmppc_get_gpr(vcpu, rs), 4, 1);

		kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		break;



	case OP_STB:

		emulated = kvmppc_handle_store(run, vcpu,

				kvmppc_get_gpr(vcpu, rs), 1, 1);

		break;



	case OP_STBU:

		emulated = kvmppc_handle_store(run, vcpu,

				kvmppc_get_gpr(vcpu, rs), 1, 1);

		kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		break;



	case OP_LHZ:

		emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);

		break;



	case OP_LHZU:

		emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);

		kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		break;



	case OP_LHA:

		emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);

		break;



	case OP_LHAU:

		emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);

		kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		break;



	case OP_STH:

		emulated = kvmppc_handle_store(run, vcpu,

				kvmppc_get_gpr(vcpu, rs), 2, 1);

		break;



	case OP_STHU:

		emulated = kvmppc_handle_store(run, vcpu,

				kvmppc_get_gpr(vcpu, rs), 2, 1);

		kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);

		break;



#ifdef CONFIG_PPC_FPU

	case OP_LFS:

		if (kvmppc_check_fp_disabled(vcpu))

			return EMULATE_DONE;
@@ -684,6 +496,7 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu) 
		break;

	}



out:

	if (emulated == EMULATE_FAIL) {

		advance = 0;

		kvmppc_core_queue_program(vcpu, 0);

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