L2 TSC needs special handling, either rdtsc exiting is
turned on or off
Signed-off-by: Qing He <qing.he@xxxxxxxxx>
---
arch/x86/hvm/vmx/nest.c | 31 +++++++++++++++++++++++++++++++
arch/x86/hvm/vmx/vmx.c | 4 ++++
include/asm-x86/hvm/vmx/nest.h | 2 ++
3 files changed, 37 insertions(+)
diff -r 2f9ba6dbbe62 -r 2332586ff957 xen/arch/x86/hvm/vmx/nest.c
--- a/xen/arch/x86/hvm/vmx/nest.c Thu Apr 22 22:30:09 2010 +0800
+++ b/xen/arch/x86/hvm/vmx/nest.c Thu Apr 22 22:30:09 2010 +0800
@@ -533,6 +533,18 @@
* Nested VMX context switch
*/
+u64 vmx_nest_get_tsc_offset(struct vcpu *v)
+{
+ u64 offset = 0;
+ struct vmx_nest_struct *nest = &v->arch.hvm_vmx.nest;
+
+ if ( __get_vvmcs(nest->vvmcs, CPU_BASED_VM_EXEC_CONTROL) &
+ CPU_BASED_USE_TSC_OFFSETING )
+ offset = __get_vvmcs(nest->vvmcs, TSC_OFFSET);
+
+ return offset;
+}
+
static unsigned long vmcs_gstate_field[] = {
/* 16 BITS */
GUEST_ES_SELECTOR,
@@ -715,6 +727,8 @@
hvm_set_cr4(__get_vvmcs(nest->vvmcs, GUEST_CR4));
hvm_set_cr3(__get_vvmcs(nest->vvmcs, GUEST_CR3));
+ hvm_funcs.set_tsc_offset(v, v->arch.hvm_vcpu.cache_tsc_offset);
+
vvmcs_to_shadow(nest->vvmcs, VM_ENTRY_INTR_INFO);
vvmcs_to_shadow(nest->vvmcs, VM_ENTRY_EXCEPTION_ERROR_CODE);
vvmcs_to_shadow(nest->vvmcs, VM_ENTRY_INSTRUCTION_LEN);
@@ -837,6 +851,8 @@
hvm_set_cr4(__get_vvmcs(nest->vvmcs, HOST_CR4));
hvm_set_cr3(__get_vvmcs(nest->vvmcs, HOST_CR3));
+ hvm_funcs.set_tsc_offset(v, v->arch.hvm_vcpu.cache_tsc_offset);
+
__set_vvmcs(nest->vvmcs, VM_ENTRY_INTR_INFO, 0);
}
@@ -1116,6 +1132,21 @@
if ( control_bit_for_reason[i].bit & ctrl )
nest->vmexit_pending = 1;
+ else if ( exit_reason == EXIT_REASON_RDTSC )
+ {
+ uint64_t tsc;
+
+ /*
+ * rdtsc can't be handled normally in the L0 handler
+ * if L1 doesn't want it
+ */
+ tsc = hvm_get_guest_tsc(v);
+ tsc += __get_vvmcs(nest->vvmcs, TSC_OFFSET);
+ regs->eax = (uint32_t)tsc;
+ regs->edx = (uint32_t)(tsc >> 32);
+
+ bypass_l0 = 1;
+ }
break;
}
diff -r 2f9ba6dbbe62 -r 2332586ff957 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Thu Apr 22 22:30:09 2010 +0800
+++ b/xen/arch/x86/hvm/vmx/vmx.c Thu Apr 22 22:30:09 2010 +0800
@@ -974,6 +974,10 @@
static void vmx_set_tsc_offset(struct vcpu *v, u64 offset)
{
vmx_vmcs_enter(v);
+
+ if ( v->arch.hvm_vcpu.in_nesting )
+ offset += vmx_nest_get_tsc_offset(v);
+
__vmwrite(TSC_OFFSET, offset);
#if defined (__i386__)
__vmwrite(TSC_OFFSET_HIGH, offset >> 32);
diff -r 2f9ba6dbbe62 -r 2332586ff957 xen/include/asm-x86/hvm/vmx/nest.h
--- a/xen/include/asm-x86/hvm/vmx/nest.h Thu Apr 22 22:30:09 2010 +0800
+++ b/xen/include/asm-x86/hvm/vmx/nest.h Thu Apr 22 22:30:09 2010 +0800
@@ -69,6 +69,8 @@
unsigned long value);
void vmx_nest_update_exception_bitmap(struct vcpu *v, unsigned long value);
+u64 vmx_nest_get_tsc_offset(struct vcpu *v);
+
void vmx_nest_idtv_handling(void);
int vmx_nest_l2_vmexit_handler(struct cpu_user_regs *regs,
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