[Xen-devel] [PATCH v12 2/4] x86emul: Add return code information to error messages

[Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>]

- print the return code of the last failed emulator operation
in hvm_dump_emulation_state.
- print the return code in sh_page_fault (SHADOW_PRINTK) to make the
distiction between X86EMUL_UNHANDLEABLE and X86EMUL_UNIMPLEMENTED.

Signed-off-by: Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

---
Changed since v11:
    * Removed "rc=" from the error message.
---
 xen/arch/x86/hvm/emulate.c        | 13 +++++++------
 xen/arch/x86/hvm/io.c             |  2 +-
 xen/arch/x86/hvm/vmx/realmode.c   |  2 +-
 xen/arch/x86/mm/shadow/multi.c    |  4 ++--
 xen/include/asm-x86/hvm/emulate.h |  2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index 385fe1e..4fe61b4 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -2056,7 +2056,7 @@ int hvm_emulate_one_mmio(unsigned long mfn, unsigned long 
gla)
     {
     case X86EMUL_UNHANDLEABLE:
     case X86EMUL_UNIMPLEMENTED:
-        hvm_dump_emulation_state(XENLOG_G_WARNING, "MMCFG", &ctxt);
+        hvm_dump_emulation_state(XENLOG_G_WARNING, "MMCFG", &ctxt, rc);
         break;
     case X86EMUL_EXCEPTION:
         hvm_inject_event(&ctxt.ctxt.event);
@@ -2115,7 +2115,7 @@ void hvm_emulate_one_vm_event(enum emul_kind kind, 
unsigned int trapnr,
         return;
     case X86EMUL_UNIMPLEMENTED:
     case X86EMUL_UNHANDLEABLE:
-        hvm_dump_emulation_state(XENLOG_G_DEBUG, "Mem event", &ctx);
+        hvm_dump_emulation_state(XENLOG_G_DEBUG, "Mem event", &ctx, rc);
         hvm_inject_hw_exception(trapnr, errcode);
         break;
     case X86EMUL_EXCEPTION:
@@ -2243,16 +2243,17 @@ static const char *guest_x86_mode_to_str(int mode)
 }
 
 void hvm_dump_emulation_state(const char *loglvl, const char *prefix,
-                              struct hvm_emulate_ctxt *hvmemul_ctxt)
+                              struct hvm_emulate_ctxt *hvmemul_ctxt, int rc)
 {
     struct vcpu *curr = current;
     const char *mode_str = guest_x86_mode_to_str(hvm_guest_x86_mode(curr));
     const struct segment_register *cs =
         hvmemul_get_seg_reg(x86_seg_cs, hvmemul_ctxt);
 
-    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);
+    printk("%s%s emulation failed (%d): %pv %s @ %04x:%08lx -> %*ph\n",
+           loglvl, prefix, rc, curr, mode_str, cs->sel,
+           hvmemul_ctxt->insn_buf_eip, hvmemul_ctxt->insn_buf_bytes,
+           hvmemul_ctxt->insn_buf);
 }
 
 /*
diff --git a/xen/arch/x86/hvm/io.c b/xen/arch/x86/hvm/io.c
index 984db21..7152c28 100644
--- a/xen/arch/x86/hvm/io.c
+++ b/xen/arch/x86/hvm/io.c
@@ -97,7 +97,7 @@ bool hvm_emulate_one_insn(hvm_emulate_validate_t *validate, 
const char *descr)
     {
     case X86EMUL_UNHANDLEABLE:
     case X86EMUL_UNIMPLEMENTED:
-        hvm_dump_emulation_state(XENLOG_G_WARNING, descr, &ctxt);
+        hvm_dump_emulation_state(XENLOG_G_WARNING, descr, &ctxt, rc);
         return false;
 
     case X86EMUL_EXCEPTION:
diff --git a/xen/arch/x86/hvm/vmx/realmode.c b/xen/arch/x86/hvm/vmx/realmode.c
index cf48139..b93792d 100644
--- a/xen/arch/x86/hvm/vmx/realmode.c
+++ b/xen/arch/x86/hvm/vmx/realmode.c
@@ -138,7 +138,7 @@ void vmx_realmode_emulate_one(struct hvm_emulate_ctxt 
*hvmemul_ctxt)
     return;
 
  fail:
-    hvm_dump_emulation_state(XENLOG_G_ERR, "Real-mode", hvmemul_ctxt);
+    hvm_dump_emulation_state(XENLOG_G_ERR, "Real-mode", hvmemul_ctxt, rc);
     domain_crash(curr->domain);
 }
 
diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c
index 2557e21..28030ac 100644
--- a/xen/arch/x86/mm/shadow/multi.c
+++ b/xen/arch/x86/mm/shadow/multi.c
@@ -3498,8 +3498,8 @@ static int sh_page_fault(struct vcpu *v,
             v->arch.paging.last_write_emul_ok = 0;
         }
 #endif
-        SHADOW_PRINTK("emulator failure, unshadowing mfn %#lx\n",
-                       mfn_x(gmfn));
+        SHADOW_PRINTK("emulator failure (rc=%d), unshadowing mfn %#lx\n",
+                       r, mfn_x(gmfn));
         /* If this is actually a page table, then we have a bug, and need
          * to support more operations in the emulator.  More likely,
          * though, this is a hint that this page should not be shadowed. */
diff --git a/xen/include/asm-x86/hvm/emulate.h 
b/xen/include/asm-x86/hvm/emulate.h
index 8864775..58d17c4 100644
--- a/xen/include/asm-x86/hvm/emulate.h
+++ b/xen/include/asm-x86/hvm/emulate.h
@@ -92,7 +92,7 @@ int hvmemul_do_pio_buffer(uint16_t port,
                           void *buffer);
 
 void hvm_dump_emulation_state(const char *loglvl, const char *prefix,
-                              struct hvm_emulate_ctxt *hvmemul_ctxt);
+                              struct hvm_emulate_ctxt *hvmemul_ctxt, int rc);
 
 #endif /* __ASM_X86_HVM_EMULATE_H__ */
 
-- 
2.7.4


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