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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] When creating exception/interrupt stack frames for a guest,
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID d916497135acf19d48c39e08eedefff621210996
# Parent c405c0d1b49b755585b615241389fd5350623dbf
When creating exception/interrupt stack frames for a guest,
set saved eflags.IF to !saved_upcall_mask. This allows the
guest to test interrupts-enabled in the interrupted context
in the same way as when running natively.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r c405c0d1b49b -r d916497135ac
linux-2.6-xen-sparse/arch/xen/i386/kernel/traps.c
--- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/traps.c Thu Nov 10 11:12:00 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/traps.c Thu Nov 10 14:03:33 2005
@@ -650,7 +650,7 @@
static inline void conditional_sti(struct pt_regs *regs)
{
- if ((uint8_t)(regs->xcs >> 16) == 0)
+ if (regs->eflags & (X86_EFLAGS_IF|VM_MASK))
local_irq_enable();
}
diff -r c405c0d1b49b -r d916497135ac
linux-2.6-xen-sparse/arch/xen/i386/mm/fault.c
--- a/linux-2.6-xen-sparse/arch/xen/i386/mm/fault.c Thu Nov 10 11:12:00 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/mm/fault.c Thu Nov 10 14:03:33 2005
@@ -300,9 +300,8 @@
if (notify_die(DIE_PAGE_FAULT, "page fault", regs, error_code, 14,
SIGSEGV) == NOTIFY_STOP)
return;
-
/* It's safe to allow irq's after cr2 has been saved */
- if ((uint8_t)(regs->xcs >> 16) == 0)
+ if (regs->eflags & (X86_EFLAGS_IF|VM_MASK))
local_irq_enable();
tsk = current;
diff -r c405c0d1b49b -r d916497135ac
linux-2.6-xen-sparse/arch/xen/x86_64/kernel/traps.c
--- a/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/traps.c Thu Nov 10
11:12:00 2005
+++ b/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/traps.c Thu Nov 10
14:03:33 2005
@@ -89,7 +89,7 @@
static inline void conditional_sti(struct pt_regs *regs)
{
- if ((uint8_t)(regs->cs >> 32) == 0)
+ if (regs->eflags & X86_EFLAGS_IF)
local_irq_enable();
}
diff -r c405c0d1b49b -r d916497135ac
linux-2.6-xen-sparse/arch/xen/x86_64/mm/fault.c
--- a/linux-2.6-xen-sparse/arch/xen/x86_64/mm/fault.c Thu Nov 10 11:12:00 2005
+++ b/linux-2.6-xen-sparse/arch/xen/x86_64/mm/fault.c Thu Nov 10 14:03:33 2005
@@ -351,7 +351,7 @@
SIGSEGV) == NOTIFY_STOP)
return;
- if (likely((uint8_t)(regs->cs >> 32) == 0))
+ if (likely(regs->eflags & X86_EFLAGS_IF))
local_irq_enable();
if (unlikely(page_fault_trace))
diff -r c405c0d1b49b -r d916497135ac xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Thu Nov 10 11:12:00 2005
+++ b/xen/arch/x86/domain.c Thu Nov 10 14:03:33 2005
@@ -647,7 +647,7 @@
regs->rip = stu.rip;
regs->cs = stu.cs | 3; /* force guest privilege */
- regs->rflags = stu.rflags;
+ regs->rflags = (stu.rflags & ~(EF_IOPL|EF_VM)) | EF_IE;
regs->rsp = stu.rsp;
regs->ss = stu.ss | 3; /* force guest privilege */
diff -r c405c0d1b49b -r d916497135ac xen/arch/x86/x86_32/entry.S
--- a/xen/arch/x86/x86_32/entry.S Thu Nov 10 11:12:00 2005
+++ b/xen/arch/x86/x86_32/entry.S Thu Nov 10 14:03:33 2005
@@ -156,7 +156,7 @@
* By this time, all the setups in the VMCS must be complete.
*/
.if \launch
- /* VMLUANCH */
+ /* VMLAUNCH */
.byte 0x0f,0x01,0xc2
pushf
call vm_launch_fail
@@ -394,7 +394,12 @@
shll $16,%eax # Bits 16-23: saved_upcall_mask
movw UREGS_cs+4(%esp),%ax # Bits 0-15: CS
FLT15: movl %eax,%gs:4(%esi)
+ test $0x00FF0000,%eax # Bits 16-23: saved_upcall_mask
+ setz %ch # %ch == !saved_upcall_mask
movl UREGS_eflags+4(%esp),%eax
+ andl $~X86_EFLAGS_IF,%eax
+ shlb $1,%ch # Bit 9 (EFLAGS.IF)
+ orb %ch,%ah # Fold EFLAGS.IF into %eax
FLT16: movl %eax,%gs:8(%esi)
test $TBF_EXCEPTION_ERRCODE,%cl
jz 1f
diff -r c405c0d1b49b -r d916497135ac xen/arch/x86/x86_64/entry.S
--- a/xen/arch/x86/x86_64/entry.S Thu Nov 10 11:12:00 2005
+++ b/xen/arch/x86/x86_64/entry.S Thu Nov 10 14:03:33 2005
@@ -352,8 +352,6 @@
FLT2: movq %rax,32(%rsi) # SS
movq UREGS_rsp+8(%rsp),%rax
FLT3: movq %rax,24(%rsi) # RSP
- movq UREGS_eflags+8(%rsp),%rax
-FLT4: movq %rax,16(%rsi) # RFLAGS
movq VCPU_vcpu_info(%rbx),%rax
pushq VCPUINFO_upcall_mask(%rax)
testb $TBF_INTERRUPT,%cl
@@ -362,7 +360,15 @@
popq %rax
shlq $32,%rax # Bits 32-39: saved_upcall_mask
movw UREGS_cs+8(%rsp),%ax # Bits 0-15: CS
-FLT5: movq %rax,8(%rsi) # CS/saved_upcall_mask
+FLT4: movq %rax,8(%rsi) # CS / saved_upcall_mask
+ shrq $32,%rax
+ testb $0xFF,%al # Bits 0-7: saved_upcall_mask
+ setz %ch # %ch == !saved_upcall_mask
+ movq UREGS_eflags+8(%rsp),%rax
+ andq $~X86_EFLAGS_IF,%rax
+ shlb $1,%ch # Bit 9 (EFLAGS.IF)
+ orb %ch,%ah # Fold EFLAGS.IF into %eax
+FLT5: movq %rax,16(%rsi) # RFLAGS
movq UREGS_rip+8(%rsp),%rax
FLT6: movq %rax,(%rsi) # RIP
testb $TBF_EXCEPTION_ERRCODE,%cl
diff -r c405c0d1b49b -r d916497135ac xen/include/public/arch-x86_32.h
--- a/xen/include/public/arch-x86_32.h Thu Nov 10 11:12:00 2005
+++ b/xen/include/public/arch-x86_32.h Thu Nov 10 14:03:33 2005
@@ -90,7 +90,7 @@
uint16_t cs;
uint8_t saved_upcall_mask;
uint8_t _pad0;
- uint32_t eflags;
+ uint32_t eflags; /* eflags.IF == !saved_upcall_mask */
uint32_t esp;
uint16_t ss, _pad1;
uint16_t es, _pad2;
diff -r c405c0d1b49b -r d916497135ac xen/include/public/arch-x86_64.h
--- a/xen/include/public/arch-x86_64.h Thu Nov 10 11:12:00 2005
+++ b/xen/include/public/arch-x86_64.h Thu Nov 10 14:03:33 2005
@@ -154,7 +154,7 @@
uint16_t cs, _pad0[1];
uint8_t saved_upcall_mask;
uint8_t _pad1[3];
- __DECL_REG(flags);
+ __DECL_REG(flags); /* rflags.IF == !saved_upcall_mask */
__DECL_REG(sp);
uint16_t ss, _pad2[3];
uint16_t es, _pad3[3];
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