Support VCPU migration
Reorganize the low level asm code to support relaunching a VMCS on a different
logical CPU.
Signed-off-by: Yunhong Jiang <yunhong.jiang@xxxxxxxxx>
Signed-off-by: Arun Sharma <arun.sharma@xxxxxxxxx>
diff -r b370beb3e107 -r e4ad3feadd4e xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Tue Aug 9 19:06:44 2005
+++ b/xen/arch/x86/domain.c Tue Aug 9 19:06:44 2005
@@ -303,6 +303,7 @@
if ( VMX_DOMAIN(v) && (v->processor != newcpu) ){
u64 vmcs_phys_ptr = (u64) virt_to_phys(v->arch.arch_vmx.vmcs);
__vmpclear(vmcs_phys_ptr);
+ v->arch.schedule_tail = arch_vmx_do_relaunch;
}
}
@@ -325,6 +326,18 @@
load_vmcs(&v->arch.arch_vmx, vmcs_phys_ptr);
vmx_do_launch(v);
reset_stack_and_jump(vmx_asm_do_launch);
+}
+
+void arch_vmx_do_relaunch(struct vcpu *v)
+{
+ u64 vmcs_phys_ptr = (u64) virt_to_phys(v->arch.arch_vmx.vmcs);
+
+ load_vmcs(&v->arch.arch_vmx, vmcs_phys_ptr);
+ vmx_do_resume(v);
+ vmx_set_host_env(v);
+ v->arch.schedule_tail = arch_vmx_do_resume;
+
+ reset_stack_and_jump(vmx_asm_do_relaunch);
}
static int vmx_final_setup_guest(
diff -r b370beb3e107 -r e4ad3feadd4e xen/arch/x86/vmx_vmcs.c
--- a/xen/arch/x86/vmx_vmcs.c Tue Aug 9 19:06:44 2005
+++ b/xen/arch/x86/vmx_vmcs.c Tue Aug 9 19:06:44 2005
@@ -198,7 +198,7 @@
host_env.idtr_limit = desc.size;
host_env.idtr_base = desc.address;
error |= __vmwrite(HOST_IDTR_BASE, host_env.idtr_base);
-
+
__asm__ __volatile__ ("sgdt (%0) \n" :: "a"(&desc) : "memory");
host_env.gdtr_limit = desc.size;
host_env.gdtr_base = desc.address;
@@ -210,7 +210,6 @@
host_env.tr_base = (unsigned long) &init_tss[cpu];
error |= __vmwrite(HOST_TR_SELECTOR, host_env.tr_selector);
error |= __vmwrite(HOST_TR_BASE, host_env.tr_base);
-
}
void vmx_do_launch(struct vcpu *v)
diff -r b370beb3e107 -r e4ad3feadd4e xen/arch/x86/x86_32/entry.S
--- a/xen/arch/x86/x86_32/entry.S Tue Aug 9 19:06:44 2005
+++ b/xen/arch/x86/x86_32/entry.S Tue Aug 9 19:06:44 2005
@@ -108,31 +108,26 @@
pushl %ecx; \
pushl %ebx;
+#define VMX_RESTORE_ALL_NOSEGREGS \
+ popl %ebx; \
+ popl %ecx; \
+ popl %edx; \
+ popl %esi; \
+ popl %edi; \
+ popl %ebp; \
+ popl %eax; \
+ addl $(NR_SKIPPED_REGS*4), %esp
+
ENTRY(vmx_asm_vmexit_handler)
/* selectors are restored/saved by VMX */
VMX_SAVE_ALL_NOSEGREGS
call vmx_vmexit_handler
jmp vmx_asm_do_resume
-ENTRY(vmx_asm_do_launch)
- popl %ebx
- popl %ecx
- popl %edx
- popl %esi
- popl %edi
- popl %ebp
- popl %eax
- addl $(NR_SKIPPED_REGS*4), %esp
- /* VMLUANCH */
- .byte 0x0f,0x01,0xc2
- pushf
- call vm_launch_fail
- hlt
-
- ALIGN
-
-ENTRY(vmx_asm_do_resume)
-vmx_test_all_events:
+.macro vmx_asm_common launch initialized
+1:
+/* vmx_test_all_events */
+ .if \initialized
GET_CURRENT(%ebx)
/*test_all_events:*/
xorl %ecx,%ecx
@@ -142,37 +137,52 @@
movl VCPU_processor(%ebx),%eax
shl $IRQSTAT_shift,%eax
test %ecx,irq_stat(%eax,1)
- jnz vmx_process_softirqs
-
-vmx_restore_all_guest:
+ jnz 2f
+
+/* vmx_restore_all_guest */
call load_cr2
+ .endif
+ VMX_RESTORE_ALL_NOSEGREGS
/*
* Check if we are going back to VMX-based VM
* By this time, all the setups in the VMCS must be complete.
*/
- popl %ebx
- popl %ecx
- popl %edx
- popl %esi
- popl %edi
- popl %ebp
- popl %eax
- addl $(NR_SKIPPED_REGS*4), %esp
+ .if \launch
+ /* VMLUANCH */
+ .byte 0x0f,0x01,0xc2
+ pushf
+ call vm_launch_fail
+ .else
/* VMRESUME */
.byte 0x0f,0x01,0xc3
pushf
call vm_resume_fail
+ .endif
/* Should never reach here */
hlt
ALIGN
-vmx_process_softirqs:
+ .if \initialized
+2:
+/* vmx_process_softirqs */
sti
call do_softirq
- jmp vmx_test_all_events
+ jmp 1b
+ ALIGN
+ .endif
+.endm
+
+ENTRY(vmx_asm_do_launch)
+ vmx_asm_common 1 0
+
+ENTRY(vmx_asm_do_resume)
+ vmx_asm_common 0 1
+
+ENTRY(vmx_asm_do_relaunch)
+ vmx_asm_common 1 1
+
#endif
- ALIGN
restore_all_guest:
testl $X86_EFLAGS_VM,UREGS_eflags(%esp)
jnz restore_all_vm86
diff -r b370beb3e107 -r e4ad3feadd4e xen/arch/x86/x86_64/entry.S
--- a/xen/arch/x86/x86_64/entry.S Tue Aug 9 19:06:44 2005
+++ b/xen/arch/x86/x86_64/entry.S Tue Aug 9 19:06:44 2005
@@ -194,39 +194,34 @@
pushq %r14; \
pushq %r15; \
+#define VMX_RESTORE_ALL_NOSEGREGS \
+ popq %r15; \
+ popq %r14; \
+ popq %r13; \
+ popq %r12; \
+ popq %rbp; \
+ popq %rbx; \
+ popq %r11; \
+ popq %r10; \
+ popq %r9; \
+ popq %r8; \
+ popq %rax; \
+ popq %rcx; \
+ popq %rdx; \
+ popq %rsi; \
+ popq %rdi; \
+ addq $(NR_SKIPPED_REGS*8), %rsp; \
+
ENTRY(vmx_asm_vmexit_handler)
/* selectors are restored/saved by VMX */
VMX_SAVE_ALL_NOSEGREGS
call vmx_vmexit_handler
jmp vmx_asm_do_resume
-ENTRY(vmx_asm_do_launch)
- popq %r15
- popq %r14
- popq %r13
- popq %r12
- popq %rbp
- popq %rbx
- popq %r11
- popq %r10
- popq %r9
- popq %r8
- popq %rax
- popq %rcx
- popq %rdx
- popq %rsi
- popq %rdi
- addq $(NR_SKIPPED_REGS*8), %rsp
- /* VMLUANCH */
- .byte 0x0f,0x01,0xc2
- pushfq
- call vm_launch_fail
- hlt
-
- ALIGN
-
-ENTRY(vmx_asm_do_resume)
-vmx_test_all_events:
+.macro vmx_asm_common launch initialized
+1:
+ .if \initialized
+/* vmx_test_all_events */
GET_CURRENT(%rbx)
/* test_all_events: */
cli # tests must not race interrupts
@@ -235,42 +230,51 @@
shl $IRQSTAT_shift,%rax
leaq irq_stat(%rip), %rdx
testl $~0,(%rdx,%rax,1)
- jnz vmx_process_softirqs
-
-vmx_restore_all_guest:
+ jnz 2f
+
+/* vmx_restore_all_guest */
call load_cr2
+ .endif
/*
* Check if we are going back to VMX-based VM
* By this time, all the setups in the VMCS must be complete.
*/
- popq %r15
- popq %r14
- popq %r13
- popq %r12
- popq %rbp
- popq %rbx
- popq %r11
- popq %r10
- popq %r9
- popq %r8
- popq %rax
- popq %rcx
- popq %rdx
- popq %rsi
- popq %rdi
- addq $(NR_SKIPPED_REGS*8), %rsp
+ VMX_RESTORE_ALL_NOSEGREGS
+ .if \launch
+ /* VMLUANCH */
+ .byte 0x0f,0x01,0xc2
+ pushfq
+ call vm_launch_fail
+ .else
/* VMRESUME */
.byte 0x0f,0x01,0xc3
pushfq
call vm_resume_fail
+ .endif
/* Should never reach here */
hlt
ALIGN
-vmx_process_softirqs:
+
+ .if \initialized
+2:
+/* vmx_process_softirqs */
sti
call do_softirq
- jmp vmx_test_all_events
+ jmp 1b
+ ALIGN
+ .endif
+.endm
+
+ENTRY(vmx_asm_do_launch)
+ vmx_asm_common 1 0
+
+ENTRY(vmx_asm_do_resume)
+ vmx_asm_common 0 1
+
+ENTRY(vmx_asm_do_relaunch)
+ vmx_asm_common 1 1
+
#endif
ALIGN
diff -r b370beb3e107 -r e4ad3feadd4e xen/include/asm-x86/vmx.h
--- a/xen/include/asm-x86/vmx.h Tue Aug 9 19:06:44 2005
+++ b/xen/include/asm-x86/vmx.h Tue Aug 9 19:06:44 2005
@@ -35,6 +35,7 @@
extern void arch_vmx_do_launch(struct vcpu *);
extern void arch_vmx_do_resume(struct vcpu *);
+extern void arch_vmx_do_relaunch(struct vcpu *);
extern int vmcs_size;
extern unsigned int cpu_rev;
diff -r b370beb3e107 -r e4ad3feadd4e xen/include/asm-x86/vmx_vmcs.h
--- a/xen/include/asm-x86/vmx_vmcs.h Tue Aug 9 19:06:44 2005
+++ b/xen/include/asm-x86/vmx_vmcs.h Tue Aug 9 19:06:44 2005
@@ -93,6 +93,7 @@
void vmx_do_launch(struct vcpu *);
void vmx_do_resume(struct vcpu *);
+void vmx_set_host_env(struct vcpu *);
struct vmcs_struct *alloc_vmcs(void);
void free_vmcs(struct vmcs_struct *);
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