x86/HVM: don't uniformly report "MMIO" for various forms of failed emulation

This helps distingushing the call paths leading there.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -2033,7 +2033,7 @@ int hvm_emulate_one_mmio(unsigned long m
     switch ( rc )
     {
     case X86EMUL_UNHANDLEABLE:
-        hvm_dump_emulation_state(XENLOG_G_WARNING "MMCFG", &ctxt);
+        hvm_dump_emulation_state(XENLOG_G_WARNING, "MMCFG", &ctxt);
         break;
     case X86EMUL_EXCEPTION:
         if ( ctxt.ctxt.event_pending )
@@ -2092,7 +2092,7 @@ void hvm_emulate_one_vm_event(enum emul_
          */
         return;
     case X86EMUL_UNHANDLEABLE:
-        hvm_dump_emulation_state(XENLOG_G_DEBUG "Mem event", &ctx);
+        hvm_dump_emulation_state(XENLOG_G_DEBUG, "Mem event", &ctx);
         hvm_inject_hw_exception(trapnr, errcode);
         break;
     case X86EMUL_EXCEPTION:
@@ -2220,7 +2220,7 @@ static const char *guest_x86_mode_to_str
     }
 }
 
-void hvm_dump_emulation_state(const char *prefix,
+void hvm_dump_emulation_state(const char *loglvl, const char *prefix,
                               struct hvm_emulate_ctxt *hvmemul_ctxt)
 {
     struct vcpu *curr = current;
@@ -2228,8 +2228,8 @@ void hvm_dump_emulation_state(const char
     const struct segment_register *cs =
         hvmemul_get_seg_reg(x86_seg_cs, hvmemul_ctxt);
 
-    printk("%s emulation failed: %pv %s @ %04x:%08lx -> %*ph\n",
-           prefix, curr, mode_str, cs->sel, hvmemul_ctxt->insn_buf_eip,
+    printk("%s%s emulation failed: %pv %s @ %04x:%08lx -> %*ph\n",
+           loglvl, prefix, curr, mode_str, cs->sel, hvmemul_ctxt->insn_buf_eip,
            hvmemul_ctxt->insn_buf_bytes, hvmemul_ctxt->insn_buf);
 }
 
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -3633,7 +3633,7 @@ int hvm_descriptor_access_intercept(uint
         hvm_monitor_descriptor_access(exit_info, vmx_exit_qualification,
                                       descriptor, is_write);
     }
-    else if ( !hvm_emulate_one_insn(is_sysdesc_access) )
+    else if ( !hvm_emulate_one_insn(is_sysdesc_access, "sysdesc access") )
         domain_crash(currd);
 
     return X86EMUL_OKAY;
--- a/xen/arch/x86/hvm/io.c
+++ b/xen/arch/x86/hvm/io.c
@@ -77,7 +77,7 @@ void send_invalidate_req(void)
         gprintk(XENLOG_ERR, "Unsuccessful map-cache invalidate\n");
 }
 
-bool hvm_emulate_one_insn(hvm_emulate_validate_t *validate)
+bool hvm_emulate_one_insn(hvm_emulate_validate_t *validate, const char *descr)
 {
     struct hvm_emulate_ctxt ctxt;
     struct vcpu *curr = current;
@@ -96,7 +96,7 @@ bool hvm_emulate_one_insn(hvm_emulate_va
     switch ( rc )
     {
     case X86EMUL_UNHANDLEABLE:
-        hvm_dump_emulation_state(XENLOG_G_WARNING "MMIO", &ctxt);
+        hvm_dump_emulation_state(XENLOG_G_WARNING, descr, &ctxt);
         return false;
 
     case X86EMUL_EXCEPTION:
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -2678,7 +2678,7 @@ void svm_vmexit_handler(struct cpu_user_
             if ( handle_pio(port, bytes, dir) )
                 __update_guest_eip(regs, vmcb->exitinfo2 - vmcb->rip);
         }
-        else if ( !hvm_emulate_one_insn(x86_insn_is_portio) )
+        else if ( !hvm_emulate_one_insn(x86_insn_is_portio, "port I/O") )
             hvm_inject_hw_exception(TRAP_gp_fault, 0);
         break;
 
@@ -2686,7 +2686,7 @@ void svm_vmexit_handler(struct cpu_user_
     case VMEXIT_CR0_WRITE ... VMEXIT_CR15_WRITE:
         if ( cpu_has_svm_decode && (vmcb->exitinfo1 & (1ULL << 63)) )
             svm_vmexit_do_cr_access(vmcb, regs);
-        else if ( !hvm_emulate_one_insn(x86_insn_is_cr_access) )
+        else if ( !hvm_emulate_one_insn(x86_insn_is_cr_access, "CR access") )
             hvm_inject_hw_exception(TRAP_gp_fault, 0);
         break;
 
@@ -2696,7 +2696,7 @@ void svm_vmexit_handler(struct cpu_user_
             svm_invlpg_intercept(vmcb->exitinfo1);
             __update_guest_eip(regs, vmcb->nextrip - vmcb->rip);
         }
-        else if ( !hvm_emulate_one_insn(is_invlpg) )
+        else if ( !hvm_emulate_one_insn(is_invlpg, "invlpg") )
             hvm_inject_hw_exception(TRAP_gp_fault, 0);
         break;
 
--- a/xen/arch/x86/hvm/vmx/realmode.c
+++ b/xen/arch/x86/hvm/vmx/realmode.c
@@ -153,7 +153,7 @@ void vmx_realmode_emulate_one(struct hvm
     return;
 
  fail:
-    hvm_dump_emulation_state(XENLOG_G_ERR "Real-mode", hvmemul_ctxt);
+    hvm_dump_emulation_state(XENLOG_G_ERR, "Real-mode", hvmemul_ctxt);
     domain_crash(curr->domain);
 }
 
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -4016,7 +4016,7 @@ void vmx_vmexit_handler(struct cpu_user_
         if ( exit_qualification & 0x10 )
         {
             /* INS, OUTS */
-            if ( !hvm_emulate_one_insn(x86_insn_is_portio) )
+            if ( !hvm_emulate_one_insn(x86_insn_is_portio, "port I/O") )
                 hvm_inject_hw_exception(TRAP_gp_fault, 0);
         }
         else
--- a/xen/include/asm-x86/hvm/emulate.h
+++ b/xen/include/asm-x86/hvm/emulate.h
@@ -49,8 +49,9 @@ enum emul_kind {
     EMUL_KIND_SET_CONTEXT_INSN
 };
 
-bool __nonnull(1) hvm_emulate_one_insn(
-    hvm_emulate_validate_t *validate);
+bool __nonnull(1, 2) hvm_emulate_one_insn(
+    hvm_emulate_validate_t *validate,
+    const char *descr);
 int hvm_emulate_one(
     struct hvm_emulate_ctxt *hvmemul_ctxt);
 void hvm_emulate_one_vm_event(enum emul_kind kind,
@@ -77,7 +78,7 @@ int hvm_emulate_one_mmio(unsigned long m
 
 static inline bool handle_mmio(void)
 {
-    return hvm_emulate_one_insn(x86_insn_is_mem_access);
+    return hvm_emulate_one_insn(x86_insn_is_mem_access, "MMIO");
 }
 
 int hvmemul_insn_fetch(enum x86_segment seg,
@@ -90,7 +91,7 @@ int hvmemul_do_pio_buffer(uint16_t port,
                           uint8_t dir,
                           void *buffer);
 
-void hvm_dump_emulation_state(const char *prefix,
+void hvm_dump_emulation_state(const char *loglvl, const char *prefix,
                               struct hvm_emulate_ctxt *hvmemul_ctxt);
 
 #endif /* __ASM_X86_HVM_EMULATE_H__ */