The softtsc code for AMD does not update the ip; enabling it on AMD-V
results in the domain spinning on the RDTSC instruction. The patch is
against xen-unstable 18331.
Signed-off-by: John Byrne <john.l.byrne@xxxxxx>
diff -r d09404ad5730 xen/arch/x86/hvm/svm/emulate.c
--- a/xen/arch/x86/hvm/svm/emulate.c Thu Aug 14 16:26:06 2008 +0100
+++ b/xen/arch/x86/hvm/svm/emulate.c Thu Aug 14 12:05:44 2008 -0500
@@ -71,6 +71,7 @@ MAKE_INSTR(VMCALL, 3, 0x0f, 0x01, 0xd9);
MAKE_INSTR(VMCALL, 3, 0x0f, 0x01, 0xd9);
MAKE_INSTR(HLT, 1, 0xf4);
MAKE_INSTR(INT3, 1, 0xcc);
+MAKE_INSTR(RDTSC, 2, 0x0f, 0x31);
static const u8 *opc_bytes[INSTR_MAX_COUNT] =
{
@@ -81,7 +82,8 @@ static const u8 *opc_bytes[INSTR_MAX_COU
[INSTR_WRMSR] = OPCODE_WRMSR,
[INSTR_VMCALL] = OPCODE_VMCALL,
[INSTR_HLT] = OPCODE_HLT,
- [INSTR_INT3] = OPCODE_INT3
+ [INSTR_INT3] = OPCODE_INT3,
+ [INSTR_RDTSC] = OPCODE_RDTSC
};
static int fetch(struct vcpu *v, u8 *buf, unsigned long addr, int len)
diff -r d09404ad5730 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c Thu Aug 14 16:26:06 2008 +0100
+++ b/xen/arch/x86/hvm/svm/svm.c Thu Aug 14 12:05:44 2008 -0500
@@ -1128,6 +1128,17 @@ static void svm_vmexit_do_hlt(struct vmc
hvm_hlt(regs->eflags);
}
+static void svm_vmexit_do_rdtsc(struct cpu_user_regs *regs)
+{
+ unsigned int inst_len;
+
+ if ( (inst_len = __get_instruction_length(current, INSTR_RDTSC)) == 0 )
+ return;
+ __update_guest_eip(regs, inst_len);
+
+ hvm_rdtsc_intercept(regs);
+}
+
static void wbinvd_ipi(void *info)
{
wbinvd();
@@ -1344,7 +1355,7 @@ asmlinkage void svm_vmexit_handler(struc
break;
case VMEXIT_RDTSC:
- hvm_rdtsc_intercept(regs);
+ svm_vmexit_do_rdtsc(regs);
break;
case VMEXIT_RDTSCP:
diff -r d09404ad5730 xen/include/asm-x86/hvm/svm/emulate.h
--- a/xen/include/asm-x86/hvm/svm/emulate.h Thu Aug 14 16:26:06 2008 +0100
+++ b/xen/include/asm-x86/hvm/svm/emulate.h Thu Aug 14 12:05:45 2008 -0500
@@ -30,6 +30,7 @@ enum instruction_index {
INSTR_VMCALL,
INSTR_HLT,
INSTR_INT3,
+ INSTR_RDTSC,
INSTR_MAX_COUNT /* Must be last - Number of instructions supported */
};
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