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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-3.0.3-testing] [HVM] Avoid mis-optimisation of the SVM/VMX exit handlers
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1159439115 -3600
# Node ID 88418d7f22f2021daa5f7d4041dde6b22d84cada
# Parent e759cc598822206629c2cfc149f5208be5528763
[HVM] Avoid mis-optimisation of the SVM/VMX exit handlers
by passing a *pointer* to the register state, instead of
'passing by value'.
This should fix the bugs resulting in display of
"trying to set reserved bit in EFER"
on the Xen console.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
xen/arch/x86/hvm/svm/svm.c | 149 +++++++++++++++++-------------------
xen/arch/x86/hvm/svm/x86_32/exits.S | 3
xen/arch/x86/hvm/svm/x86_64/exits.S | 1
xen/arch/x86/hvm/vmx/vmx.c | 64 +++++++--------
xen/arch/x86/hvm/vmx/x86_32/exits.S | 3
xen/arch/x86/hvm/vmx/x86_64/exits.S | 1
xen/include/asm-x86/hvm/support.h | 2
7 files changed, 114 insertions(+), 109 deletions(-)
diff -r e759cc598822 -r 88418d7f22f2 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c Thu Sep 28 10:10:59 2006 +0100
+++ b/xen/arch/x86/hvm/svm/svm.c Thu Sep 28 11:25:15 2006 +0100
@@ -2564,9 +2564,7 @@ void walk_shadow_and_guest_pt(unsigned l
#endif /* SVM_WALK_GUEST_PAGES */
-
-
-asmlinkage void svm_vmexit_handler(struct cpu_user_regs regs)
+asmlinkage void svm_vmexit_handler(struct cpu_user_regs *regs)
{
unsigned int exit_reason;
unsigned long eip;
@@ -2578,7 +2576,7 @@ asmlinkage void svm_vmexit_handler(struc
ASSERT(vmcb);
exit_reason = vmcb->exitcode;
- save_svm_cpu_user_regs(v, ®s);
+ save_svm_cpu_user_regs(v, regs);
vmcb->tlb_control = 1;
@@ -2602,26 +2600,26 @@ asmlinkage void svm_vmexit_handler(struc
if (svm_paging_enabled(v) &&
!mmio_space(shadow_gva_to_gpa(current, vmcb->exitinfo2)))
{
- printk("I%08ld,ExC=%s(%d),IP=%x:%llx,"
- "I1=%llx,I2=%llx,INT=%llx, "
- "gpa=%llx\n", intercepts_counter,
- exit_reasons[exit_reason], exit_reason, regs.cs,
- (unsigned long long) regs.rip,
- (unsigned long long) vmcb->exitinfo1,
- (unsigned long long) vmcb->exitinfo2,
- (unsigned long long) vmcb->exitintinfo.bytes,
- (unsigned long long) shadow_gva_to_gpa(current,
vmcb->exitinfo2));
+ printk("I%08ld,ExC=%s(%d),IP=%x:%"PRIx64","
+ "I1=%"PRIx64",I2=%"PRIx64",INT=%"PRIx64", "
+ "gpa=%"PRIx64"\n", intercepts_counter,
+ exit_reasons[exit_reason], exit_reason, regs->cs,
+ (u64)regs->rip,
+ (u64)vmcb->exitinfo1,
+ (u64)vmcb->exitinfo2,
+ (u64)vmcb->exitintinfo.bytes,
+ (u64)shadow_gva_to_gpa(current, vmcb->exitinfo2));
}
else
{
- printk("I%08ld,ExC=%s(%d),IP=%x:%llx,"
- "I1=%llx,I2=%llx,INT=%llx\n",
+ printk("I%08ld,ExC=%s(%d),IP=%x:%"PRIx64","
+ "I1=%"PRIx64",I2=%"PRIx64",INT=%"PRIx64"\n",
intercepts_counter,
- exit_reasons[exit_reason], exit_reason, regs.cs,
- (unsigned long long) regs.rip,
- (unsigned long long) vmcb->exitinfo1,
- (unsigned long long) vmcb->exitinfo2,
- (unsigned long long) vmcb->exitintinfo.bytes );
+ exit_reasons[exit_reason], exit_reason, regs->cs,
+ (u64)regs->rip,
+ (u64)vmcb->exitinfo1,
+ (u64)vmcb->exitinfo2,
+ (u64)vmcb->exitintinfo.bytes );
}
}
else if ( svm_dbg_on
@@ -2631,24 +2629,24 @@ asmlinkage void svm_vmexit_handler(struc
if (exit_reasons[exit_reason])
{
- printk("I%08ld,ExC=%s(%d),IP=%x:%llx,"
- "I1=%llx,I2=%llx,INT=%llx\n",
+ printk("I%08ld,ExC=%s(%d),IP=%x:%"PRIx64","
+ "I1=%"PRIx64",I2=%"PRIx64",INT=%"PRIx64"\n",
intercepts_counter,
- exit_reasons[exit_reason], exit_reason, regs.cs,
- (unsigned long long) regs.rip,
- (unsigned long long) vmcb->exitinfo1,
- (unsigned long long) vmcb->exitinfo2,
- (unsigned long long) vmcb->exitintinfo.bytes);
+ exit_reasons[exit_reason], exit_reason, regs->cs,
+ (u64)regs->rip,
+ (u64)vmcb->exitinfo1,
+ (u64)vmcb->exitinfo2,
+ (u64)vmcb->exitintinfo.bytes);
}
else
{
- printk("I%08ld,ExC=%d(0x%x),IP=%x:%llx,"
- "I1=%llx,I2=%llx,INT=%llx\n",
- intercepts_counter, exit_reason, exit_reason, regs.cs,
- (unsigned long long) regs.rip,
- (unsigned long long) vmcb->exitinfo1,
- (unsigned long long) vmcb->exitinfo2,
- (unsigned long long) vmcb->exitintinfo.bytes);
+ printk("I%08ld,ExC=%d(0x%x),IP=%x:%"PRIx64","
+ "I1=%"PRIx64",I2=%"PRIx64",INT=%"PRIx64"\n",
+ intercepts_counter, exit_reason, exit_reason, regs->cs,
+ (u64)regs->rip,
+ (u64)vmcb->exitinfo1,
+ (u64)vmcb->exitinfo2,
+ (u64)vmcb->exitintinfo.bytes);
}
}
@@ -2680,7 +2678,7 @@ asmlinkage void svm_vmexit_handler(struc
(int) v->arch.shadow_table.pfn);
svm_dump_vmcb(__func__, vmcb);
- svm_dump_regs(__func__, ®s);
+ svm_dump_regs(__func__, regs);
svm_dump_inst(svm_rip2pointer(vmcb));
}
@@ -2710,18 +2708,18 @@ asmlinkage void svm_vmexit_handler(struc
case VMEXIT_EXCEPTION_DB:
{
#ifdef XEN_DEBUGGER
- svm_debug_save_cpu_user_regs(®s);
- pdb_handle_exception(1, ®s, 1);
- svm_debug_restore_cpu_user_regs(®s);
+ svm_debug_save_cpu_user_regs(regs);
+ pdb_handle_exception(1, regs, 1);
+ svm_debug_restore_cpu_user_regs(regs);
#else
- svm_store_cpu_user_regs(®s, v);
+ svm_store_cpu_user_regs(regs, v);
domain_pause_for_debugger();
#endif
}
break;
case VMEXIT_NMI:
- do_nmi(®s, 0);
+ do_nmi(regs, 0);
break;
case VMEXIT_SMI:
@@ -2741,9 +2739,9 @@ asmlinkage void svm_vmexit_handler(struc
case VMEXIT_EXCEPTION_BP:
#ifdef XEN_DEBUGGER
- svm_debug_save_cpu_user_regs(®s);
- pdb_handle_exception(3, ®s, 1);
- svm_debug_restore_cpu_user_regs(®s);
+ svm_debug_save_cpu_user_regs(regs);
+ pdb_handle_exception(3, regs, 1);
+ svm_debug_restore_cpu_user_regs(regs);
#else
if ( test_bit(_DOMF_debugging, &v->domain->domain_flags) )
domain_pause_for_debugger();
@@ -2758,25 +2756,25 @@ asmlinkage void svm_vmexit_handler(struc
case VMEXIT_EXCEPTION_GP:
/* This should probably not be trapped in the future */
- regs.error_code = vmcb->exitinfo1;
- svm_do_general_protection_fault(v, ®s);
+ regs->error_code = vmcb->exitinfo1;
+ svm_do_general_protection_fault(v, regs);
break;
case VMEXIT_EXCEPTION_PF:
{
unsigned long va;
va = vmcb->exitinfo2;
- regs.error_code = vmcb->exitinfo1;
+ regs->error_code = vmcb->exitinfo1;
HVM_DBG_LOG(DBG_LEVEL_VMMU,
"eax=%lx, ebx=%lx, ecx=%lx, edx=%lx, esi=%lx, edi=%lx",
- (unsigned long)regs.eax, (unsigned long)regs.ebx,
- (unsigned long)regs.ecx, (unsigned long)regs.edx,
- (unsigned long)regs.esi, (unsigned long)regs.edi);
-
- if (!(error = svm_do_page_fault(va, ®s)))
+ (unsigned long)regs->eax, (unsigned long)regs->ebx,
+ (unsigned long)regs->ecx, (unsigned long)regs->edx,
+ (unsigned long)regs->esi, (unsigned long)regs->edi);
+
+ if (!(error = svm_do_page_fault(va, regs)))
{
/* Inject #PG using Interruption-Information Fields */
- svm_inject_exception(v, TRAP_page_fault, 1, regs.error_code);
+ svm_inject_exception(v, TRAP_page_fault, 1, regs->error_code);
v->arch.hvm_svm.cpu_cr2 = va;
vmcb->cr2 = va;
@@ -2789,7 +2787,7 @@ asmlinkage void svm_vmexit_handler(struc
case VMEXIT_EXCEPTION_DF:
/* Debug info to hopefully help debug WHY the guest double-faulted. */
svm_dump_vmcb(__func__, vmcb);
- svm_dump_regs(__func__, ®s);
+ svm_dump_regs(__func__, regs);
svm_dump_inst(svm_rip2pointer(vmcb));
svm_inject_exception(v, TRAP_double_fault, 1, 0);
break;
@@ -2806,11 +2804,11 @@ asmlinkage void svm_vmexit_handler(struc
break;
case VMEXIT_TASK_SWITCH:
- __hvm_bug(®s);
+ __hvm_bug(regs);
break;
case VMEXIT_CPUID:
- svm_vmexit_do_cpuid(vmcb, regs.eax, ®s);
+ svm_vmexit_do_cpuid(vmcb, regs->eax, regs);
break;
case VMEXIT_HLT:
@@ -2818,60 +2816,60 @@ asmlinkage void svm_vmexit_handler(struc
break;
case VMEXIT_INVLPG:
- svm_handle_invlpg(0, ®s);
+ svm_handle_invlpg(0, regs);
break;
case VMEXIT_INVLPGA:
- svm_handle_invlpg(1, ®s);
+ svm_handle_invlpg(1, regs);
break;
case VMEXIT_VMMCALL:
- svm_do_vmmcall(v, ®s);
+ svm_do_vmmcall(v, regs);
break;
case VMEXIT_CR0_READ:
- svm_cr_access(v, 0, TYPE_MOV_FROM_CR, ®s);
+ svm_cr_access(v, 0, TYPE_MOV_FROM_CR, regs);
break;
case VMEXIT_CR2_READ:
- svm_cr_access(v, 2, TYPE_MOV_FROM_CR, ®s);
+ svm_cr_access(v, 2, TYPE_MOV_FROM_CR, regs);
break;
case VMEXIT_CR3_READ:
- svm_cr_access(v, 3, TYPE_MOV_FROM_CR, ®s);
+ svm_cr_access(v, 3, TYPE_MOV_FROM_CR, regs);
break;
case VMEXIT_CR4_READ:
- svm_cr_access(v, 4, TYPE_MOV_FROM_CR, ®s);
+ svm_cr_access(v, 4, TYPE_MOV_FROM_CR, regs);
break;
case VMEXIT_CR8_READ:
- svm_cr_access(v, 8, TYPE_MOV_FROM_CR, ®s);
+ svm_cr_access(v, 8, TYPE_MOV_FROM_CR, regs);
break;
case VMEXIT_CR0_WRITE:
- svm_cr_access(v, 0, TYPE_MOV_TO_CR, ®s);
+ svm_cr_access(v, 0, TYPE_MOV_TO_CR, regs);
break;
case VMEXIT_CR2_WRITE:
- svm_cr_access(v, 2, TYPE_MOV_TO_CR, ®s);
+ svm_cr_access(v, 2, TYPE_MOV_TO_CR, regs);
break;
case VMEXIT_CR3_WRITE:
- svm_cr_access(v, 3, TYPE_MOV_TO_CR, ®s);
+ svm_cr_access(v, 3, TYPE_MOV_TO_CR, regs);
local_flush_tlb();
break;
case VMEXIT_CR4_WRITE:
- svm_cr_access(v, 4, TYPE_MOV_TO_CR, ®s);
+ svm_cr_access(v, 4, TYPE_MOV_TO_CR, regs);
break;
case VMEXIT_CR8_WRITE:
- svm_cr_access(v, 8, TYPE_MOV_TO_CR, ®s);
+ svm_cr_access(v, 8, TYPE_MOV_TO_CR, regs);
break;
case VMEXIT_DR0_WRITE ... VMEXIT_DR7_WRITE:
- svm_dr_access(v, ®s);
+ svm_dr_access(v, regs);
break;
case VMEXIT_IOIO:
@@ -2879,7 +2877,7 @@ asmlinkage void svm_vmexit_handler(struc
break;
case VMEXIT_MSR:
- svm_do_msr_access(v, ®s);
+ svm_do_msr_access(v, regs);
break;
case VMEXIT_SHUTDOWN:
@@ -2888,11 +2886,10 @@ asmlinkage void svm_vmexit_handler(struc
break;
default:
- printk("unexpected VMEXIT: exit reason = 0x%x, exitinfo1 = %llx, "
- "exitinfo2 = %llx\n", exit_reason,
- (unsigned long long)vmcb->exitinfo1,
- (unsigned long long)vmcb->exitinfo2);
- __hvm_bug(®s); /* should not happen */
+ printk("unexpected VMEXIT: exit reason = 0x%x, exitinfo1 = %"PRIx64", "
+ "exitinfo2 = %"PRIx64"\n", exit_reason,
+ (u64)vmcb->exitinfo1, (u64)vmcb->exitinfo2);
+ __hvm_bug(regs); /* should not happen */
break;
}
@@ -2900,7 +2897,7 @@ asmlinkage void svm_vmexit_handler(struc
if (do_debug)
{
printk("%s: Done switch on vmexit_code\n", __func__);
- svm_dump_regs(__func__, ®s);
+ svm_dump_regs(__func__, regs);
}
if (do_debug)
diff -r e759cc598822 -r 88418d7f22f2 xen/arch/x86/hvm/svm/x86_32/exits.S
--- a/xen/arch/x86/hvm/svm/x86_32/exits.S Thu Sep 28 10:10:59 2006 +0100
+++ b/xen/arch/x86/hvm/svm/x86_32/exits.S Thu Sep 28 11:25:15 2006 +0100
@@ -126,7 +126,10 @@ ENTRY(svm_asm_do_launch)
HVM_SAVE_ALL_NOSEGREGS
STGI
+ movl %esp,%eax
+ push %eax
call svm_vmexit_handler
+ addl $4,%esp
jmp svm_asm_do_resume
ALIGN
diff -r e759cc598822 -r 88418d7f22f2 xen/arch/x86/hvm/svm/x86_64/exits.S
--- a/xen/arch/x86/hvm/svm/x86_64/exits.S Thu Sep 28 10:10:59 2006 +0100
+++ b/xen/arch/x86/hvm/svm/x86_64/exits.S Thu Sep 28 11:25:15 2006 +0100
@@ -144,6 +144,7 @@ ENTRY(svm_asm_do_launch)
VMLOAD
STGI
+ movq %rsp,%rdi
call svm_vmexit_handler
jmp svm_asm_do_resume
diff -r e759cc598822 -r 88418d7f22f2 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Thu Sep 28 10:10:59 2006 +0100
+++ b/xen/arch/x86/hvm/vmx/vmx.c Thu Sep 28 11:25:15 2006 +0100
@@ -2111,7 +2111,7 @@ static void vmx_reflect_exception(struct
}
}
-asmlinkage void vmx_vmexit_handler(struct cpu_user_regs regs)
+asmlinkage void vmx_vmexit_handler(struct cpu_user_regs *regs)
{
unsigned int exit_reason;
unsigned long exit_qualification, rip, inst_len = 0;
@@ -2182,16 +2182,16 @@ asmlinkage void vmx_vmexit_handler(struc
#ifdef XEN_DEBUGGER
case TRAP_debug:
{
- save_cpu_user_regs(®s);
- pdb_handle_exception(1, ®s, 1);
- restore_cpu_user_regs(®s);
+ save_cpu_user_regs(regs);
+ pdb_handle_exception(1, regs, 1);
+ restore_cpu_user_regs(regs);
break;
}
case TRAP_int3:
{
- save_cpu_user_regs(®s);
- pdb_handle_exception(3, ®s, 1);
- restore_cpu_user_regs(®s);
+ save_cpu_user_regs(regs);
+ pdb_handle_exception(3, regs, 1);
+ restore_cpu_user_regs(regs);
break;
}
#else
@@ -2201,7 +2201,7 @@ asmlinkage void vmx_vmexit_handler(struc
if ( test_bit(_DOMF_debugging, &v->domain->domain_flags) )
{
- store_cpu_user_regs(®s);
+ store_cpu_user_regs(regs);
domain_pause_for_debugger();
__vm_clear_bit(GUEST_PENDING_DBG_EXCEPTIONS,
PENDING_DEBUG_EXC_BS);
@@ -2232,29 +2232,29 @@ asmlinkage void vmx_vmexit_handler(struc
case TRAP_page_fault:
{
__vmread(EXIT_QUALIFICATION, &va);
- __vmread(VM_EXIT_INTR_ERROR_CODE, ®s.error_code);
-
- TRACE_VMEXIT(3,regs.error_code);
- TRACE_VMEXIT(4,va);
+ __vmread(VM_EXIT_INTR_ERROR_CODE, ®s->error_code);
+
+ TRACE_VMEXIT(3, regs->error_code);
+ TRACE_VMEXIT(4, va);
HVM_DBG_LOG(DBG_LEVEL_VMMU,
"eax=%lx, ebx=%lx, ecx=%lx, edx=%lx, esi=%lx, edi=%lx",
- (unsigned long)regs.eax, (unsigned long)regs.ebx,
- (unsigned long)regs.ecx, (unsigned long)regs.edx,
- (unsigned long)regs.esi, (unsigned long)regs.edi);
-
- if ( !vmx_do_page_fault(va, ®s) ) {
- /*
- * Inject #PG using Interruption-Information Fields
- */
- vmx_inject_hw_exception(v, TRAP_page_fault, regs.error_code);
+ (unsigned long)regs->eax, (unsigned long)regs->ebx,
+ (unsigned long)regs->ecx, (unsigned long)regs->edx,
+ (unsigned long)regs->esi, (unsigned long)regs->edi);
+
+ if ( !vmx_do_page_fault(va, regs) )
+ {
+ /* Inject #PG using Interruption-Information Fields. */
+ vmx_inject_hw_exception(v, TRAP_page_fault, regs->error_code);
v->arch.hvm_vmx.cpu_cr2 = va;
- TRACE_3D(TRC_VMX_INT, v->domain->domain_id, TRAP_page_fault,
va);
+ TRACE_3D(TRC_VMX_INT, v->domain->domain_id,
+ TRAP_page_fault, va);
}
break;
}
case TRAP_nmi:
- do_nmi(®s);
+ do_nmi(regs);
break;
default:
vmx_reflect_exception(v);
@@ -2263,7 +2263,7 @@ asmlinkage void vmx_vmexit_handler(struc
break;
}
case EXIT_REASON_EXTERNAL_INTERRUPT:
- vmx_vmexit_do_extint(®s);
+ vmx_vmexit_do_extint(regs);
break;
case EXIT_REASON_TRIPLE_FAULT:
domain_crash_synchronous();
@@ -2280,7 +2280,7 @@ asmlinkage void vmx_vmexit_handler(struc
case EXIT_REASON_CPUID:
inst_len = __get_instruction_length(); /* Safe: CPUID */
__update_guest_eip(inst_len);
- vmx_vmexit_do_cpuid(®s);
+ vmx_vmexit_do_cpuid(regs);
break;
case EXIT_REASON_HLT:
inst_len = __get_instruction_length(); /* Safe: HLT */
@@ -2302,7 +2302,7 @@ asmlinkage void vmx_vmexit_handler(struc
__update_guest_eip(inst_len);
__vmread(GUEST_RIP, &rip);
__vmread(EXIT_QUALIFICATION, &exit_qualification);
- hvm_do_hypercall(®s);
+ hvm_do_hypercall(regs);
break;
}
case EXIT_REASON_CR_ACCESS:
@@ -2310,15 +2310,15 @@ asmlinkage void vmx_vmexit_handler(struc
__vmread(GUEST_RIP, &rip);
__vmread(EXIT_QUALIFICATION, &exit_qualification);
inst_len = __get_instruction_length(); /* Safe: MOV Cn, LMSW, CLTS */
- if ( vmx_cr_access(exit_qualification, ®s) )
+ if ( vmx_cr_access(exit_qualification, regs) )
__update_guest_eip(inst_len);
- TRACE_VMEXIT(3,regs.error_code);
- TRACE_VMEXIT(4,exit_qualification);
+ TRACE_VMEXIT(3, regs->error_code);
+ TRACE_VMEXIT(4, exit_qualification);
break;
}
case EXIT_REASON_DR_ACCESS:
__vmread(EXIT_QUALIFICATION, &exit_qualification);
- vmx_dr_access(exit_qualification, ®s);
+ vmx_dr_access(exit_qualification, regs);
break;
case EXIT_REASON_IO_INSTRUCTION:
__vmread(EXIT_QUALIFICATION, &exit_qualification);
@@ -2329,12 +2329,12 @@ asmlinkage void vmx_vmexit_handler(struc
case EXIT_REASON_MSR_READ:
inst_len = __get_instruction_length(); /* Safe: RDMSR */
__update_guest_eip(inst_len);
- vmx_do_msr_read(®s);
+ vmx_do_msr_read(regs);
break;
case EXIT_REASON_MSR_WRITE:
inst_len = __get_instruction_length(); /* Safe: WRMSR */
__update_guest_eip(inst_len);
- vmx_do_msr_write(®s);
+ vmx_do_msr_write(regs);
break;
case EXIT_REASON_MWAIT_INSTRUCTION:
case EXIT_REASON_MONITOR_INSTRUCTION:
diff -r e759cc598822 -r 88418d7f22f2 xen/arch/x86/hvm/vmx/x86_32/exits.S
--- a/xen/arch/x86/hvm/vmx/x86_32/exits.S Thu Sep 28 10:10:59 2006 +0100
+++ b/xen/arch/x86/hvm/vmx/x86_32/exits.S Thu Sep 28 11:25:15 2006 +0100
@@ -82,7 +82,10 @@ ENTRY(vmx_asm_vmexit_handler)
/* selectors are restored/saved by VMX */
HVM_SAVE_ALL_NOSEGREGS
call vmx_trace_vmexit
+ movl %esp,%eax
+ push %eax
call vmx_vmexit_handler
+ addl $4,%esp
jmp vmx_asm_do_vmentry
ALIGN
diff -r e759cc598822 -r 88418d7f22f2 xen/arch/x86/hvm/vmx/x86_64/exits.S
--- a/xen/arch/x86/hvm/vmx/x86_64/exits.S Thu Sep 28 10:10:59 2006 +0100
+++ b/xen/arch/x86/hvm/vmx/x86_64/exits.S Thu Sep 28 11:25:15 2006 +0100
@@ -93,6 +93,7 @@ ENTRY(vmx_asm_vmexit_handler)
/* selectors are restored/saved by VMX */
HVM_SAVE_ALL_NOSEGREGS
call vmx_trace_vmexit
+ movq %rsp,%rdi
call vmx_vmexit_handler
jmp vmx_asm_do_vmentry
diff -r e759cc598822 -r 88418d7f22f2 xen/include/asm-x86/hvm/support.h
--- a/xen/include/asm-x86/hvm/support.h Thu Sep 28 10:10:59 2006 +0100
+++ b/xen/include/asm-x86/hvm/support.h Thu Sep 28 11:25:15 2006 +0100
@@ -118,7 +118,7 @@ extern unsigned int opt_hvm_debug_level;
extern unsigned int opt_hvm_debug_level;
#define HVM_DBG_LOG(level, _f, _a...) \
do { \
- if ( (level) & opt_hvm_debug_level ) \
+ if ( unlikely((level) & opt_hvm_debug_level) ) \
printk("[HVM:%d.%d] <%s> " _f "\n", \
current->domain->domain_id, current->vcpu_id, __func__, \
## _a); \
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