KVM: x86 emulator: make emulator memory callbacks return full exception
This way, they can return #GP, not just #PF. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity
parent
da9cb575b1
commit
bcc55cba9f
@ -70,7 +70,8 @@ struct x86_emulate_ops {
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* @bytes: [IN ] Number of bytes to read from memory.
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*/
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int (*read_std)(unsigned long addr, void *val,
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unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error);
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unsigned int bytes, struct kvm_vcpu *vcpu,
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struct x86_exception *fault);
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/*
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* write_std: Write bytes of standard (non-emulated/special) memory.
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@ -80,7 +81,8 @@ struct x86_emulate_ops {
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* @bytes: [IN ] Number of bytes to write to memory.
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*/
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int (*write_std)(unsigned long addr, void *val,
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unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error);
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unsigned int bytes, struct kvm_vcpu *vcpu,
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struct x86_exception *fault);
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/*
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* fetch: Read bytes of standard (non-emulated/special) memory.
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* Used for instruction fetch.
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@ -89,7 +91,8 @@ struct x86_emulate_ops {
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* @bytes: [IN ] Number of bytes to read from memory.
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*/
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int (*fetch)(unsigned long addr, void *val,
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unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error);
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unsigned int bytes, struct kvm_vcpu *vcpu,
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struct x86_exception *fault);
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/*
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* read_emulated: Read bytes from emulated/special memory area.
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@ -100,7 +103,7 @@ struct x86_emulate_ops {
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int (*read_emulated)(unsigned long addr,
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void *val,
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unsigned int bytes,
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unsigned int *error,
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struct x86_exception *fault,
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struct kvm_vcpu *vcpu);
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/*
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@ -113,7 +116,7 @@ struct x86_emulate_ops {
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int (*write_emulated)(unsigned long addr,
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const void *val,
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unsigned int bytes,
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unsigned int *error,
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struct x86_exception *fault,
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struct kvm_vcpu *vcpu);
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/*
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@ -128,7 +131,7 @@ struct x86_emulate_ops {
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const void *old,
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const void *new,
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unsigned int bytes,
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unsigned int *error,
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struct x86_exception *fault,
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struct kvm_vcpu *vcpu);
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int (*pio_in_emulated)(int size, unsigned short port, void *val,
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@ -512,7 +512,7 @@ static int do_fetch_insn_byte(struct x86_emulate_ctxt *ctxt,
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cur_size = fc->end - fc->start;
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size = min(15UL - cur_size, PAGE_SIZE - offset_in_page(eip));
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rc = ops->fetch(ctxt->cs_base + eip, fc->data + cur_size,
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size, ctxt->vcpu, NULL);
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size, ctxt->vcpu, &ctxt->exception);
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if (rc != X86EMUL_CONTINUE)
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return rc;
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fc->end += size;
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@ -565,12 +565,12 @@ static int read_descriptor(struct x86_emulate_ctxt *ctxt,
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op_bytes = 3;
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*address = 0;
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rc = ops->read_std(linear(ctxt, addr), (unsigned long *)size, 2,
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ctxt->vcpu, NULL);
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ctxt->vcpu, &ctxt->exception);
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if (rc != X86EMUL_CONTINUE)
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return rc;
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addr.ea += 2;
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rc = ops->read_std(linear(ctxt, addr), address, op_bytes,
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ctxt->vcpu, NULL);
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ctxt->vcpu, &ctxt->exception);
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return rc;
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}
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@ -816,7 +816,6 @@ static int read_emulated(struct x86_emulate_ctxt *ctxt,
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{
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int rc;
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struct read_cache *mc = &ctxt->decode.mem_read;
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u32 err;
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while (size) {
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int n = min(size, 8u);
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@ -824,10 +823,8 @@ static int read_emulated(struct x86_emulate_ctxt *ctxt,
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if (mc->pos < mc->end)
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goto read_cached;
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rc = ops->read_emulated(addr, mc->data + mc->end, n, &err,
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ctxt->vcpu);
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if (rc == X86EMUL_PROPAGATE_FAULT)
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emulate_pf(ctxt);
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rc = ops->read_emulated(addr, mc->data + mc->end, n,
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&ctxt->exception, ctxt->vcpu);
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if (rc != X86EMUL_CONTINUE)
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return rc;
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mc->end += n;
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@ -902,7 +899,6 @@ static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
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struct desc_ptr dt;
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u16 index = selector >> 3;
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int ret;
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u32 err;
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ulong addr;
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get_descriptor_table_ptr(ctxt, ops, selector, &dt);
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@ -912,9 +908,8 @@ static int read_segment_descriptor(struct x86_emulate_ctxt *ctxt,
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return X86EMUL_PROPAGATE_FAULT;
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}
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addr = dt.address + index * 8;
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ret = ops->read_std(addr, desc, sizeof *desc, ctxt->vcpu, &err);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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emulate_pf(ctxt);
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ret = ops->read_std(addr, desc, sizeof *desc, ctxt->vcpu,
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&ctxt->exception);
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return ret;
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}
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@ -926,7 +921,6 @@ static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
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{
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struct desc_ptr dt;
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u16 index = selector >> 3;
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u32 err;
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ulong addr;
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int ret;
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@ -938,9 +932,8 @@ static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
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}
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addr = dt.address + index * 8;
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ret = ops->write_std(addr, desc, sizeof *desc, ctxt->vcpu, &err);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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emulate_pf(ctxt);
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ret = ops->write_std(addr, desc, sizeof *desc, ctxt->vcpu,
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&ctxt->exception);
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return ret;
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}
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@ -1087,7 +1080,6 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
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{
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int rc;
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struct decode_cache *c = &ctxt->decode;
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u32 err;
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switch (c->dst.type) {
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case OP_REG:
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@ -1100,17 +1092,15 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
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&c->dst.orig_val,
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&c->dst.val,
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c->dst.bytes,
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&err,
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&ctxt->exception,
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ctxt->vcpu);
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else
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rc = ops->write_emulated(
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linear(ctxt, c->dst.addr.mem),
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&c->dst.val,
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c->dst.bytes,
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&err,
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&ctxt->exception,
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ctxt->vcpu);
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if (rc == X86EMUL_PROPAGATE_FAULT)
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emulate_pf(ctxt);
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if (rc != X86EMUL_CONTINUE)
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return rc;
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break;
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@ -1283,7 +1273,6 @@ int emulate_int_real(struct x86_emulate_ctxt *ctxt,
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gva_t cs_addr;
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gva_t eip_addr;
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u16 cs, eip;
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u32 err;
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/* TODO: Add limit checks */
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c->src.val = ctxt->eflags;
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@ -1313,11 +1302,11 @@ int emulate_int_real(struct x86_emulate_ctxt *ctxt,
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eip_addr = dt.address + (irq << 2);
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cs_addr = dt.address + (irq << 2) + 2;
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rc = ops->read_std(cs_addr, &cs, 2, ctxt->vcpu, &err);
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rc = ops->read_std(cs_addr, &cs, 2, ctxt->vcpu, &ctxt->exception);
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if (rc != X86EMUL_CONTINUE)
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return rc;
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rc = ops->read_std(eip_addr, &eip, 2, ctxt->vcpu, &err);
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rc = ops->read_std(eip_addr, &eip, 2, ctxt->vcpu, &ctxt->exception);
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if (rc != X86EMUL_CONTINUE)
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return rc;
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@ -1930,33 +1919,27 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt,
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{
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struct tss_segment_16 tss_seg;
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int ret;
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u32 err, new_tss_base = get_desc_base(new_desc);
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u32 new_tss_base = get_desc_base(new_desc);
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ret = ops->read_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
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&err);
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if (ret == X86EMUL_PROPAGATE_FAULT) {
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&ctxt->exception);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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/* FIXME: need to provide precise fault address */
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emulate_pf(ctxt);
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return ret;
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}
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save_state_to_tss16(ctxt, ops, &tss_seg);
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ret = ops->write_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
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&err);
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if (ret == X86EMUL_PROPAGATE_FAULT) {
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&ctxt->exception);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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/* FIXME: need to provide precise fault address */
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emulate_pf(ctxt);
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return ret;
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}
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ret = ops->read_std(new_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
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&err);
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if (ret == X86EMUL_PROPAGATE_FAULT) {
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&ctxt->exception);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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/* FIXME: need to provide precise fault address */
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emulate_pf(ctxt);
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return ret;
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}
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if (old_tss_sel != 0xffff) {
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tss_seg.prev_task_link = old_tss_sel;
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@ -1964,12 +1947,10 @@ static int task_switch_16(struct x86_emulate_ctxt *ctxt,
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ret = ops->write_std(new_tss_base,
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&tss_seg.prev_task_link,
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sizeof tss_seg.prev_task_link,
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ctxt->vcpu, &err);
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if (ret == X86EMUL_PROPAGATE_FAULT) {
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ctxt->vcpu, &ctxt->exception);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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/* FIXME: need to provide precise fault address */
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emulate_pf(ctxt);
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return ret;
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}
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}
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return load_state_from_tss16(ctxt, ops, &tss_seg);
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@ -2072,33 +2053,27 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt,
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{
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struct tss_segment_32 tss_seg;
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int ret;
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u32 err, new_tss_base = get_desc_base(new_desc);
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u32 new_tss_base = get_desc_base(new_desc);
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ret = ops->read_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
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&err);
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if (ret == X86EMUL_PROPAGATE_FAULT) {
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&ctxt->exception);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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/* FIXME: need to provide precise fault address */
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emulate_pf(ctxt);
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return ret;
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}
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save_state_to_tss32(ctxt, ops, &tss_seg);
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ret = ops->write_std(old_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
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&err);
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if (ret == X86EMUL_PROPAGATE_FAULT) {
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&ctxt->exception);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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/* FIXME: need to provide precise fault address */
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emulate_pf(ctxt);
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return ret;
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}
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ret = ops->read_std(new_tss_base, &tss_seg, sizeof tss_seg, ctxt->vcpu,
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&err);
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if (ret == X86EMUL_PROPAGATE_FAULT) {
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&ctxt->exception);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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/* FIXME: need to provide precise fault address */
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emulate_pf(ctxt);
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return ret;
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}
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if (old_tss_sel != 0xffff) {
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tss_seg.prev_task_link = old_tss_sel;
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@ -2106,12 +2081,10 @@ static int task_switch_32(struct x86_emulate_ctxt *ctxt,
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ret = ops->write_std(new_tss_base,
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&tss_seg.prev_task_link,
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sizeof tss_seg.prev_task_link,
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ctxt->vcpu, &err);
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if (ret == X86EMUL_PROPAGATE_FAULT) {
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ctxt->vcpu, &ctxt->exception);
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if (ret == X86EMUL_PROPAGATE_FAULT)
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/* FIXME: need to provide precise fault address */
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emulate_pf(ctxt);
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return ret;
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}
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}
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return load_state_from_tss32(ctxt, ops, &tss_seg);
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@ -3642,24 +3642,31 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, u32 *error)
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return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, error);
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}
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static int make_page_fault(struct x86_exception *exception, u32 error)
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{
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exception->vector = PF_VECTOR;
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exception->error_code_valid = true;
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exception->error_code = error;
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return X86EMUL_PROPAGATE_FAULT;
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}
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static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
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struct kvm_vcpu *vcpu, u32 access,
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u32 *error)
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struct x86_exception *exception)
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{
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void *data = val;
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int r = X86EMUL_CONTINUE;
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u32 error;
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while (bytes) {
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gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
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error);
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&error);
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unsigned offset = addr & (PAGE_SIZE-1);
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unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
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int ret;
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if (gpa == UNMAPPED_GVA) {
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r = X86EMUL_PROPAGATE_FAULT;
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goto out;
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}
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if (gpa == UNMAPPED_GVA)
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return make_page_fault(exception, error);
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ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
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if (ret < 0) {
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r = X86EMUL_IO_NEEDED;
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@ -3676,47 +3683,50 @@ static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
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/* used for instruction fetching */
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static int kvm_fetch_guest_virt(gva_t addr, void *val, unsigned int bytes,
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struct kvm_vcpu *vcpu, u32 *error)
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struct kvm_vcpu *vcpu,
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struct x86_exception *exception)
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{
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u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
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return kvm_read_guest_virt_helper(addr, val, bytes, vcpu,
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access | PFERR_FETCH_MASK, error);
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access | PFERR_FETCH_MASK,
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exception);
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}
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static int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
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struct kvm_vcpu *vcpu, u32 *error)
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struct kvm_vcpu *vcpu,
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struct x86_exception *exception)
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{
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u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
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return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
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error);
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exception);
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}
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static int kvm_read_guest_virt_system(gva_t addr, void *val, unsigned int bytes,
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struct kvm_vcpu *vcpu, u32 *error)
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struct kvm_vcpu *vcpu,
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struct x86_exception *exception)
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{
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return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, error);
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return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
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}
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static int kvm_write_guest_virt_system(gva_t addr, void *val,
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unsigned int bytes,
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struct kvm_vcpu *vcpu,
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u32 *error)
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struct x86_exception *exception)
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{
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void *data = val;
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int r = X86EMUL_CONTINUE;
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u32 error;
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while (bytes) {
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gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
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PFERR_WRITE_MASK,
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error);
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&error);
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unsigned offset = addr & (PAGE_SIZE-1);
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unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
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int ret;
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if (gpa == UNMAPPED_GVA) {
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r = X86EMUL_PROPAGATE_FAULT;
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goto out;
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}
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if (gpa == UNMAPPED_GVA)
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return make_page_fault(exception, error);
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ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
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if (ret < 0) {
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r = X86EMUL_IO_NEEDED;
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@ -3734,10 +3744,11 @@ static int kvm_write_guest_virt_system(gva_t addr, void *val,
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static int emulator_read_emulated(unsigned long addr,
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void *val,
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unsigned int bytes,
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unsigned int *error_code,
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struct x86_exception *exception,
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struct kvm_vcpu *vcpu)
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{
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gpa_t gpa;
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u32 error_code;
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if (vcpu->mmio_read_completed) {
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memcpy(val, vcpu->mmio_data, bytes);
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@ -3747,17 +3758,17 @@ static int emulator_read_emulated(unsigned long addr,
|
||||
return X86EMUL_CONTINUE;
|
||||
}
|
||||
|
||||
gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, error_code);
|
||||
gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, &error_code);
|
||||
|
||||
if (gpa == UNMAPPED_GVA)
|
||||
return X86EMUL_PROPAGATE_FAULT;
|
||||
return make_page_fault(exception, error_code);
|
||||
|
||||
/* For APIC access vmexit */
|
||||
if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
|
||||
goto mmio;
|
||||
|
||||
if (kvm_read_guest_virt(addr, val, bytes, vcpu, NULL)
|
||||
== X86EMUL_CONTINUE)
|
||||
if (kvm_read_guest_virt(addr, val, bytes, vcpu, exception)
|
||||
== X86EMUL_CONTINUE)
|
||||
return X86EMUL_CONTINUE;
|
||||
|
||||
mmio:
|
||||
@ -3781,7 +3792,7 @@ static int emulator_read_emulated(unsigned long addr,
|
||||
}
|
||||
|
||||
int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
|
||||
const void *val, int bytes)
|
||||
const void *val, int bytes)
|
||||
{
|
||||
int ret;
|
||||
|
||||
@ -3795,15 +3806,16 @@ int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
|
||||
static int emulator_write_emulated_onepage(unsigned long addr,
|
||||
const void *val,
|
||||
unsigned int bytes,
|
||||
unsigned int *error_code,
|
||||
struct x86_exception *exception,
|
||||
struct kvm_vcpu *vcpu)
|
||||
{
|
||||
gpa_t gpa;
|
||||
u32 error_code;
|
||||
|
||||
gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, error_code);
|
||||
gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, &error_code);
|
||||
|
||||
if (gpa == UNMAPPED_GVA)
|
||||
return X86EMUL_PROPAGATE_FAULT;
|
||||
return make_page_fault(exception, error_code);
|
||||
|
||||
/* For APIC access vmexit */
|
||||
if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
|
||||
@ -3833,7 +3845,7 @@ static int emulator_write_emulated_onepage(unsigned long addr,
|
||||
int emulator_write_emulated(unsigned long addr,
|
||||
const void *val,
|
||||
unsigned int bytes,
|
||||
unsigned int *error_code,
|
||||
struct x86_exception *exception,
|
||||
struct kvm_vcpu *vcpu)
|
||||
{
|
||||
/* Crossing a page boundary? */
|
||||
@ -3841,7 +3853,7 @@ int emulator_write_emulated(unsigned long addr,
|
||||
int rc, now;
|
||||
|
||||
now = -addr & ~PAGE_MASK;
|
||||
rc = emulator_write_emulated_onepage(addr, val, now, error_code,
|
||||
rc = emulator_write_emulated_onepage(addr, val, now, exception,
|
||||
vcpu);
|
||||
if (rc != X86EMUL_CONTINUE)
|
||||
return rc;
|
||||
@ -3849,7 +3861,7 @@ int emulator_write_emulated(unsigned long addr,
|
||||
val += now;
|
||||
bytes -= now;
|
||||
}
|
||||
return emulator_write_emulated_onepage(addr, val, bytes, error_code,
|
||||
return emulator_write_emulated_onepage(addr, val, bytes, exception,
|
||||
vcpu);
|
||||
}
|
||||
|
||||
@ -3867,7 +3879,7 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
|
||||
const void *old,
|
||||
const void *new,
|
||||
unsigned int bytes,
|
||||
unsigned int *error_code,
|
||||
struct x86_exception *exception,
|
||||
struct kvm_vcpu *vcpu)
|
||||
{
|
||||
gpa_t gpa;
|
||||
@ -3925,7 +3937,7 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
|
||||
emul_write:
|
||||
printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
|
||||
|
||||
return emulator_write_emulated(addr, new, bytes, error_code, vcpu);
|
||||
return emulator_write_emulated(addr, new, bytes, exception, vcpu);
|
||||
}
|
||||
|
||||
static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user