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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Xen saves the upcall mask onto the stack when making an upcall to the
ChangeSet 1.1427, 2005/05/17 10:14:58+01:00, kaf24@xxxxxxxxxxxxxxxxxxxx
Xen saves the upcall mask onto the stack when making an upcall to the
guest. This can be used by the guest to determine whether it must
re-enable event delivery on return from the upcall activation.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
linux-2.6.11-xen-sparse/arch/xen/i386/kernel/entry.S | 95 ++++++-------------
xen/arch/x86/traps.c | 8 -
xen/arch/x86/x86_32/asm-offsets.c | 1
xen/arch/x86/x86_32/entry.S | 12 +-
xen/arch/x86/x86_32/seg_fixup.c | 4
xen/arch/x86/x86_64/asm-offsets.c | 1
xen/arch/x86/x86_64/entry.S | 16 ++-
xen/arch/x86/x86_64/traps.c | 2
xen/include/public/arch-x86_32.h | 14 +-
xen/include/public/arch-x86_64.h | 34 +++---
10 files changed, 85 insertions(+), 102 deletions(-)
diff -Nru a/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/entry.S
b/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/entry.S
--- a/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/entry.S 2005-05-17
07:03:51 -04:00
+++ b/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/entry.S 2005-05-17
07:03:51 -04:00
@@ -83,42 +83,28 @@
#define sizeof_vcpu_shift 3
#ifdef CONFIG_SMP
-#define XEN_GET_VCPU_INFO(reg)
#define preempt_disable(reg) incl TI_preempt_count(reg)
#define preempt_enable(reg) decl TI_preempt_count(reg)
-#define XEN_LOCK_VCPU_INFO_SMP(reg) preempt_disable(%ebp) ; \
+#define XEN_GET_VCPU_INFO(reg) preempt_disable(%ebp) ; \
movl TI_cpu(%ebp),reg ; \
shl $sizeof_vcpu_shift,reg ; \
addl HYPERVISOR_shared_info,reg
-#define XEN_UNLOCK_VCPU_INFO_SMP(reg) preempt_enable(%ebp)
-#define XEN_UNLOCK_VCPU_INFO_SMP_fixup .byte 0xff,0xff,0xff
-#define Ux00 0xff
-#define XEN_LOCKED_BLOCK_EVENTS(reg) movb $1,evtchn_upcall_mask(reg)
-#define XEN_BLOCK_EVENTS(reg) XEN_LOCK_VCPU_INFO_SMP(reg) ; \
- XEN_LOCKED_BLOCK_EVENTS(reg) ; \
- XEN_UNLOCK_VCPU_INFO_SMP(reg)
-#define XEN_UNBLOCK_EVENTS(reg) XEN_LOCK_VCPU_INFO_SMP(reg)
; \
- movb $0,evtchn_upcall_mask(reg) ; \
- XEN_UNLOCK_VCPU_INFO_SMP(reg)
-#define XEN_SAVE_UPCALL_MASK(reg,tmp,off) GET_THREAD_INFO(%ebp)
; \
- XEN_LOCK_VCPU_INFO_SMP(reg) ; \
- movb evtchn_upcall_mask(reg), tmp ; \
- movb tmp, off(%esp) ; \
- XEN_UNLOCK_VCPU_INFO_SMP(reg)
+#define XEN_PUT_VCPU_INFO(reg) preempt_enable(%ebp)
+#define XEN_PUT_VCPU_INFO_fixup .byte 0xff,0xff,0xff
#else
-#define XEN_GET_VCPU_INFO(reg) movl HYPERVISOR_shared_info,reg
-#define XEN_LOCK_VCPU_INFO_SMP(reg)
-#define XEN_UNLOCK_VCPU_INFO_SMP(reg)
-#define XEN_UNLOCK_VCPU_INFO_SMP_fixup
-#define Ux00 0x00
-#define XEN_LOCKED_BLOCK_EVENTS(reg) movb $1,evtchn_upcall_mask(reg)
-#define XEN_BLOCK_EVENTS(reg) XEN_LOCKED_BLOCK_EVENTS(reg)
-#define XEN_UNBLOCK_EVENTS(reg) movb $0,evtchn_upcall_mask(reg)
-#define XEN_SAVE_UPCALL_MASK(reg,tmp,off) \
- movb evtchn_upcall_mask(reg), tmp; \
- movb tmp, off(%esp)
+#define XEN_GET_VCPU_INFO(reg) movl HYPERVISOR_shared_info,reg
+#define XEN_PUT_VCPU_INFO(reg)
+#define XEN_PUT_VCPU_INFO_fixup
#endif
+#define XEN_LOCKED_BLOCK_EVENTS(reg) movb $1,evtchn_upcall_mask(reg)
+#define XEN_LOCKED_UNBLOCK_EVENTS(reg) movb $0,evtchn_upcall_mask(reg)
+#define XEN_BLOCK_EVENTS(reg) XEN_GET_VCPU_INFO(reg) ; \
+ XEN_LOCKED_BLOCK_EVENTS(reg) ; \
+ XEN_PUT_VCPU_INFO(reg)
+#define XEN_UNBLOCK_EVENTS(reg) XEN_GET_VCPU_INFO(reg)
; \
+ XEN_LOCKED_UNBLOCK_EVENTS(reg) ; \
+ XEN_PUT_VCPU_INFO(reg)
#define XEN_TEST_PENDING(reg) testb $0xFF,evtchn_upcall_pending(reg)
#ifdef CONFIG_PREEMPT
@@ -128,7 +114,7 @@
#define resume_kernel restore_all
#endif
-#define SAVE_ALL_NO_EVENTMASK \
+#define SAVE_ALL \
cld; \
pushl %es; \
pushl %ds; \
@@ -141,12 +127,7 @@
pushl %ebx; \
movl $(__USER_DS), %edx; \
movl %edx, %ds; \
- movl %edx, %es;
-
-#define SAVE_ALL \
- SAVE_ALL_NO_EVENTMASK; \
- XEN_GET_VCPU_INFO(%esi); \
- XEN_SAVE_UPCALL_MASK(%esi,%dl,EVENT_MASK)
+ movl %edx, %es
#define RESTORE_INT_REGS \
popl %ebx; \
@@ -196,7 +177,6 @@
call schedule_tail
GET_THREAD_INFO(%ebp)
popl %eax
- XEN_GET_VCPU_INFO(%esi)
jmp syscall_exit
/*
@@ -217,7 +197,6 @@
testl $(VM_MASK | 2), %eax
jz resume_kernel # returning to kernel or vm86-space
ENTRY(resume_userspace)
- XEN_GET_VCPU_INFO(%esi)
XEN_BLOCK_EVENTS(%esi) # make sure we don't miss an interrupt
# setting need_resched or sigpending
# between sampling and the iret
@@ -229,7 +208,6 @@
#ifdef CONFIG_PREEMPT
ENTRY(resume_kernel)
- XEN_GET_VCPU_INFO(%esi)
XEN_BLOCK_EVENTS(%esi)
cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ?
jnz restore_all
@@ -316,11 +294,11 @@
jnz resume_vm86
movb EVENT_MASK(%esp), %al
notb %al # %al == ~saved_mask
- XEN_LOCK_VCPU_INFO_SMP(%esi)
+ XEN_GET_VCPU_INFO(%esi)
andb evtchn_upcall_mask(%esi),%al
andb $1,%al # %al == mask & ~saved_mask
jnz restore_all_enable_events # != 0 => reenable event delivery
- XEN_UNLOCK_VCPU_INFO_SMP(%esi)
+ XEN_PUT_VCPU_INFO(%esi)
RESTORE_ALL
resume_vm86:
@@ -470,8 +448,6 @@
movl %ecx, %ds
movl %ecx, %es
movl %esp,%eax # pt_regs pointer
- XEN_GET_VCPU_INFO(%esi)
- XEN_SAVE_UPCALL_MASK(%esi,%bl,EVENT_MASK)
call *%edi
jmp ret_from_exception
@@ -488,29 +464,27 @@
# activation and restart the handler using the previous one.
ENTRY(hypervisor_callback)
pushl %eax
- SAVE_ALL_NO_EVENTMASK
+ SAVE_ALL
movl EIP(%esp),%eax
cmpl $scrit,%eax
jb 11f
cmpl $ecrit,%eax
jb critical_region_fixup
-11: XEN_GET_VCPU_INFO(%esi)
- movb $0, EVENT_MASK(%esp)
- push %esp
+11: push %esp
call evtchn_do_upcall
add $4,%esp
jmp ret_from_intr
ALIGN
restore_all_enable_events:
- XEN_UNBLOCK_EVENTS(%esi)
+ XEN_LOCKED_UNBLOCK_EVENTS(%esi)
scrit: /**** START OF CRITICAL REGION ****/
XEN_TEST_PENDING(%esi)
jnz 14f # process more events if necessary...
- XEN_UNLOCK_VCPU_INFO_SMP(%esi)
+ XEN_PUT_VCPU_INFO(%esi)
RESTORE_ALL
14: XEN_LOCKED_BLOCK_EVENTS(%esi)
- XEN_UNLOCK_VCPU_INFO_SMP(%esi)
+ XEN_PUT_VCPU_INFO(%esi)
jmp 11b
ecrit: /**** END OF CRITICAL REGION ****/
# [How we do the fixup]. We want to merge the current stack frame with the
@@ -523,15 +497,12 @@
critical_region_fixup:
addl $critical_fixup_table-scrit,%eax
movzbl (%eax),%eax # %eax contains num bytes popped
-#ifdef CONFIG_SMP
- cmpb $0xff,%al
+ cmpb $0xff,%al # 0xff => vcpu_info critical region
jne 15f
- add $1,%al
GET_THREAD_INFO(%ebp)
- XEN_UNLOCK_VCPU_INFO_SMP(%esi)
-15:
-#endif
- mov %esp,%esi
+ XEN_PUT_VCPU_INFO(%esi) # abort vcpu_info critical region
+ xorl %eax,%eax
+15: mov %esp,%esi
add %eax,%esi # %esi points at end of src region
mov %esp,%edi
add $0x34,%edi # %edi points at end of dst region
@@ -547,9 +518,9 @@
jmp 11b
critical_fixup_table:
- .byte Ux00,Ux00,Ux00 # testb $0xff,(%esi) = XEN_TEST_PENDING
- .byte Ux00,Ux00 # jnz 14f
- XEN_UNLOCK_VCPU_INFO_SMP_fixup
+ .byte 0xff,0xff,0xff # testb $0xff,(%esi) = XEN_TEST_PENDING
+ .byte 0xff,0xff # jnz 14f
+ XEN_PUT_VCPU_INFO_fixup
.byte 0x00 # pop %ebx
.byte 0x04 # pop %ecx
.byte 0x08 # pop %edx
@@ -561,8 +532,8 @@
.byte 0x20 # pop %es
.byte 0x24,0x24,0x24 # add $4,%esp
.byte 0x28 # iret
- .byte Ux00,Ux00,Ux00,Ux00 # movb $1,1(%esi)
- XEN_UNLOCK_VCPU_INFO_SMP_fixup
+ .byte 0xff,0xff,0xff,0xff # movb $1,1(%esi)
+ XEN_PUT_VCPU_INFO_fixup
.byte 0x00,0x00 # jmp 11b
# Hypervisor uses this for application faults while it executes.
@@ -766,8 +737,6 @@
movl %eax, %ds
movl %eax, %es
movl %esp,%eax /* pt_regs pointer */
- XEN_GET_VCPU_INFO(%esi)
- XEN_SAVE_UPCALL_MASK(%esi,%bl,EVENT_MASK)
call do_page_fault
jmp ret_from_exception
diff -Nru a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c 2005-05-17 07:03:50 -04:00
+++ b/xen/arch/x86/traps.c 2005-05-17 07:03:51 -04:00
@@ -257,7 +257,7 @@
tb->error_code = regs->error_code;
}
if ( TI_GET_IF(ti) )
- ed->vcpu_info->evtchn_upcall_mask = 1;
+ tb->flags |= TBF_INTERRUPT;
return 0;
xen_fault:
@@ -322,7 +322,7 @@
tb->cs = ti->cs;
tb->eip = ti->address;
if ( TI_GET_IF(ti) )
- ed->vcpu_info->evtchn_upcall_mask = 1;
+ tb->flags |= TBF_INTERRUPT;
return 0;
}
@@ -345,7 +345,7 @@
tb->cs = ti->cs;
tb->eip = ti->address;
if ( TI_GET_IF(ti) )
- ed->vcpu_info->evtchn_upcall_mask = 1;
+ tb->flags |= TBF_INTERRUPT;
ed->arch.guest_cr2 = addr;
}
@@ -911,7 +911,7 @@
tb->cs = ti->cs;
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