[PATCH v4] xen: get rid of paravirt op adjust_exception_frame
From: Juergen Gross
Date: Fri Aug 11 2017 - 10:55:02 EST
When running as Xen pv-guest the exception frame on the stack contains
%r11 and %rcx additional to the other data pushed by the processor.
Instead of having a paravirt op being called for each exception type
prepend the Xen specific code to each exception entry. When running as
Xen pv-guest just use the exception entry with prepended instructions,
otherwise use the entry without the Xen specific code.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
arch/x86/entry/entry_64.S | 23 ++-------
arch/x86/entry/entry_64_compat.S | 1 -
arch/x86/include/asm/paravirt.h | 5 --
arch/x86/include/asm/paravirt_types.h | 4 --
arch/x86/include/asm/proto.h | 3 ++
arch/x86/include/asm/traps.h | 33 ++++++++++--
arch/x86/kernel/asm-offsets_64.c | 1 -
arch/x86/kernel/paravirt.c | 3 --
arch/x86/xen/enlighten_pv.c | 96 +++++++++++++++++++++++------------
arch/x86/xen/irq.c | 3 --
arch/x86/xen/xen-asm_64.S | 45 ++++++++++++++--
arch/x86/xen/xen-ops.h | 1 -
12 files changed, 140 insertions(+), 78 deletions(-)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index d271fb79248f..67fefaf21312 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -746,7 +746,6 @@ ENTRY(\sym)
.endif
ASM_CLAC
- PARAVIRT_ADJUST_EXCEPTION_FRAME
.ifeq \has_error_code
pushq $-1 /* ORIG_RAX: no syscall to restart */
@@ -902,7 +901,7 @@ ENTRY(do_softirq_own_stack)
END(do_softirq_own_stack)
#ifdef CONFIG_XEN
-idtentry xen_hypervisor_callback xen_do_hypervisor_callback has_error_code=0
+idtentry hypervisor_callback xen_do_hypervisor_callback has_error_code=0
/*
* A note on the "critical region" in our callback handler.
@@ -968,8 +967,6 @@ ENTRY(xen_failsafe_callback)
movq 8(%rsp), %r11
addq $0x30, %rsp
pushq $0 /* RIP */
- pushq %r11
- pushq %rcx
jmp general_protection
1: /* Segment mismatch => Category 1 (Bad segment). Retry the IRET. */
movq (%rsp), %rcx
@@ -998,9 +995,8 @@ idtentry int3 do_int3 has_error_code=0 paranoid=1 shift_ist=DEBUG_STACK
idtentry stack_segment do_stack_segment has_error_code=1
#ifdef CONFIG_XEN
-idtentry xen_debug do_debug has_error_code=0
-idtentry xen_int3 do_int3 has_error_code=0
-idtentry xen_stack_segment do_stack_segment has_error_code=1
+idtentry xendebug do_debug has_error_code=0
+idtentry xenint3 do_int3 has_error_code=0
#endif
idtentry general_protection do_general_protection has_error_code=1
@@ -1160,20 +1156,9 @@ ENTRY(error_exit)
END(error_exit)
/* Runs on exception stack */
+/* XXX: broken on Xen PV */
ENTRY(nmi)
/*
- * Fix up the exception frame if we're on Xen.
- * PARAVIRT_ADJUST_EXCEPTION_FRAME is guaranteed to push at most
- * one value to the stack on native, so it may clobber the rdx
- * scratch slot, but it won't clobber any of the important
- * slots past it.
- *
- * Xen is a different story, because the Xen frame itself overlaps
- * the "NMI executing" variable.
- */
- PARAVIRT_ADJUST_EXCEPTION_FRAME
-
- /*
* We allow breakpoints in NMIs. If a breakpoint occurs, then
* the iretq it performs will take us out of NMI context.
* This means that we can have nested NMIs where the next
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index e1721dafbcb1..843d2f08397b 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -294,7 +294,6 @@ ENTRY(entry_INT80_compat)
/*
* Interrupts are off on entry.
*/
- PARAVIRT_ADJUST_EXCEPTION_FRAME
ASM_CLAC /* Do this early to minimize exposure */
SWAPGS
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 9ccac1926587..c25dd22f7c70 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -960,11 +960,6 @@ extern void default_banner(void);
#define GET_CR2_INTO_RAX \
call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
-#define PARAVIRT_ADJUST_EXCEPTION_FRAME \
- PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
- CLBR_NONE, \
- call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
-
#define USERGS_SYSRET64 \
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64), \
CLBR_NONE, \
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 9ffc36bfe4cd..c55106726938 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -195,10 +195,6 @@ struct pv_irq_ops {
void (*safe_halt)(void);
void (*halt)(void);
-
-#ifdef CONFIG_X86_64
- void (*adjust_exception_frame)(void);
-#endif
} __no_randomize_layout;
struct pv_mmu_ops {
diff --git a/arch/x86/include/asm/proto.h b/arch/x86/include/asm/proto.h
index 8d3964fc5f91..b408b1886195 100644
--- a/arch/x86/include/asm/proto.h
+++ b/arch/x86/include/asm/proto.h
@@ -24,6 +24,9 @@ void entry_SYSENTER_compat(void);
void __end_entry_SYSENTER_compat(void);
void entry_SYSCALL_compat(void);
void entry_INT80_compat(void);
+#if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV)
+void xen_entry_INT80_compat(void);
+#endif
#endif
void x86_configure_nx(void);
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 01fd0a7f48cd..935709829a4e 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -13,9 +13,6 @@ asmlinkage void divide_error(void);
asmlinkage void debug(void);
asmlinkage void nmi(void);
asmlinkage void int3(void);
-asmlinkage void xen_debug(void);
-asmlinkage void xen_int3(void);
-asmlinkage void xen_stack_segment(void);
asmlinkage void overflow(void);
asmlinkage void bounds(void);
asmlinkage void invalid_op(void);
@@ -38,6 +35,32 @@ asmlinkage void machine_check(void);
#endif /* CONFIG_X86_MCE */
asmlinkage void simd_coprocessor_error(void);
+#if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV)
+asmlinkage void xen_divide_error(void);
+asmlinkage void xen_xendebug(void);
+asmlinkage void xen_xenint3(void);
+asmlinkage void xen_nmi(void);
+asmlinkage void xen_overflow(void);
+asmlinkage void xen_bounds(void);
+asmlinkage void xen_invalid_op(void);
+asmlinkage void xen_device_not_available(void);
+asmlinkage void xen_double_fault(void);
+asmlinkage void xen_coprocessor_segment_overrun(void);
+asmlinkage void xen_invalid_TSS(void);
+asmlinkage void xen_segment_not_present(void);
+asmlinkage void xen_stack_segment(void);
+asmlinkage void xen_general_protection(void);
+asmlinkage void xen_page_fault(void);
+asmlinkage void xen_async_page_fault(void);
+asmlinkage void xen_spurious_interrupt_bug(void);
+asmlinkage void xen_coprocessor_error(void);
+asmlinkage void xen_alignment_check(void);
+#ifdef CONFIG_X86_MCE
+asmlinkage void xen_machine_check(void);
+#endif /* CONFIG_X86_MCE */
+asmlinkage void xen_simd_coprocessor_error(void);
+#endif
+
#ifdef CONFIG_TRACING
asmlinkage void trace_page_fault(void);
#define trace_stack_segment stack_segment
@@ -54,6 +77,10 @@ asmlinkage void trace_page_fault(void);
#define trace_alignment_check alignment_check
#define trace_simd_coprocessor_error simd_coprocessor_error
#define trace_async_page_fault async_page_fault
+
+#if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV)
+asmlinkage void xen_trace_page_fault(void);
+#endif
#endif
dotraplinkage void do_divide_error(struct pt_regs *, long);
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index 99332f550c48..cf42206926af 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -20,7 +20,6 @@ static char syscalls_ia32[] = {
int main(void)
{
#ifdef CONFIG_PARAVIRT
- OFFSET(PV_IRQ_adjust_exception_frame, pv_irq_ops, adjust_exception_frame);
OFFSET(PV_CPU_usergs_sysret64, pv_cpu_ops, usergs_sysret64);
OFFSET(PV_CPU_swapgs, pv_cpu_ops, swapgs);
BLANK();
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index bc0a849589bb..a14df9eecfed 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -319,9 +319,6 @@ __visible struct pv_irq_ops pv_irq_ops = {
.irq_enable = __PV_IS_CALLEE_SAVE(native_irq_enable),
.safe_halt = native_safe_halt,
.halt = native_halt,
-#ifdef CONFIG_X86_64
- .adjust_exception_frame = paravirt_nop,
-#endif
};
__visible struct pv_cpu_ops pv_cpu_ops = {
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 811e4ddb3f37..2d759fdd77b5 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -579,6 +579,68 @@ static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
preempt_enable();
}
+#ifdef CONFIG_X86_64
+static struct {
+ void (*orig)(void);
+ void (*xen)(void);
+ bool ist_okay;
+} trap_array[] = {
+ { debug, xen_xendebug, true },
+ { int3, xen_xenint3, true },
+ { double_fault, xen_double_fault, true },
+#ifdef CONFIG_X86_MCE
+ { machine_check, xen_machine_check, true },
+#endif
+ { nmi, xen_nmi, true },
+ { overflow, xen_overflow, false },
+#ifdef CONFIG_IA32_EMULATION
+ { entry_INT80_compat, xen_entry_INT80_compat, false },
+#endif
+ { page_fault, xen_page_fault, false },
+ { divide_error, xen_divide_error, false },
+ { bounds, xen_bounds, false },
+ { invalid_op, xen_invalid_op, false },
+ { device_not_available, xen_device_not_available, false },
+ { coprocessor_segment_overrun, xen_coprocessor_segment_overrun, false },
+ { invalid_TSS, xen_invalid_TSS, false },
+ { segment_not_present, xen_segment_not_present, false },
+ { stack_segment, xen_stack_segment, false },
+ { general_protection, xen_general_protection, false },
+ { spurious_interrupt_bug, xen_spurious_interrupt_bug, false },
+ { coprocessor_error, xen_coprocessor_error, false },
+ { alignment_check, xen_alignment_check, false },
+ { simd_coprocessor_error, xen_simd_coprocessor_error, false },
+#ifdef CONFIG_TRACING
+ { trace_page_fault, xen_trace_page_fault, false },
+#endif
+};
+
+static bool get_trap_addr(unsigned long *addr, unsigned int ist)
+{
+ unsigned int nr;
+ bool ist_okay = false;
+
+ /*
+ * Replace trap handler addresses by Xen specific ones.
+ * Check for known traps using IST and whitelist them.
+ * The debugger ones are the only ones we care about.
+ * Xen will handle faults like double_fault, * so we should never see
+ * them. Warn if there's an unexpected IST-using fault handler.
+ */
+ for (nr = 0; nr < ARRAY_SIZE(trap_array); nr++)
+ if (*addr == (unsigned long)trap_array[nr].orig) {
+ *addr = (unsigned long)trap_array[nr].xen;
+ ist_okay = trap_array[nr].ist_okay;
+ break;
+ }
+
+ if (WARN_ON(ist != 0 && !ist_okay))
+ return false;
+
+ return true;
+}
+#endif
+
static int cvt_gate_to_trap(int vector, const gate_desc *val,
struct trap_info *info)
{
@@ -591,40 +653,8 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val,
addr = gate_offset(*val);
#ifdef CONFIG_X86_64
- /*
- * Look for known traps using IST, and substitute them
- * appropriately. The debugger ones are the only ones we care
- * about. Xen will handle faults like double_fault,
- * so we should never see them. Warn if
- * there's an unexpected IST-using fault handler.
- */
- if (addr == (unsigned long)debug)
- addr = (unsigned long)xen_debug;
- else if (addr == (unsigned long)int3)
- addr = (unsigned long)xen_int3;
- else if (addr == (unsigned long)stack_segment)
- addr = (unsigned long)xen_stack_segment;
- else if (addr == (unsigned long)double_fault) {
- /* Don't need to handle these */
+ if (!get_trap_addr(&addr, val->ist))
return 0;
-#ifdef CONFIG_X86_MCE
- } else if (addr == (unsigned long)machine_check) {
- /*
- * when xen hypervisor inject vMCE to guest,
- * use native mce handler to handle it
- */
- ;
-#endif
- } else if (addr == (unsigned long)nmi)
- /*
- * Use the native version as well.
- */
- ;
- else {
- /* Some other trap using IST? */
- if (WARN_ON(val->ist != 0))
- return 0;
- }
#endif /* CONFIG_X86_64 */
info->address = addr;
diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
index 33e92955e09d..d4eff5676cfa 100644
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -123,9 +123,6 @@ static const struct pv_irq_ops xen_irq_ops __initconst = {
.safe_halt = xen_safe_halt,
.halt = xen_halt,
-#ifdef CONFIG_X86_64
- .adjust_exception_frame = xen_adjust_exception_frame,
-#endif
};
void __init xen_init_irq_ops(void)
diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index c3df43141e70..f72ff71cc897 100644
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -22,11 +22,46 @@
#include "xen-asm.h"
-ENTRY(xen_adjust_exception_frame)
- mov 8+0(%rsp), %rcx
- mov 8+8(%rsp), %r11
- ret $16
-ENDPROC(xen_adjust_exception_frame)
+.macro xen_pv_trap name
+ENTRY(xen_\name)
+ pop %rcx
+ pop %r11
+ jmp \name
+END(xen_\name)
+.endm
+
+xen_pv_trap divide_error
+xen_pv_trap debug
+xen_pv_trap xendebug
+xen_pv_trap int3
+xen_pv_trap xenint3
+xen_pv_trap nmi
+xen_pv_trap overflow
+xen_pv_trap bounds
+xen_pv_trap invalid_op
+xen_pv_trap device_not_available
+xen_pv_trap double_fault
+xen_pv_trap coprocessor_segment_overrun
+xen_pv_trap invalid_TSS
+xen_pv_trap segment_not_present
+xen_pv_trap stack_segment
+xen_pv_trap general_protection
+xen_pv_trap page_fault
+xen_pv_trap async_page_fault
+xen_pv_trap spurious_interrupt_bug
+xen_pv_trap coprocessor_error
+xen_pv_trap alignment_check
+#ifdef CONFIG_X86_MCE
+xen_pv_trap machine_check
+#endif /* CONFIG_X86_MCE */
+xen_pv_trap simd_coprocessor_error
+#ifdef CONFIG_IA32_EMULATION
+xen_pv_trap entry_INT80_compat
+#endif
+#ifdef CONFIG_TRACING
+xen_pv_trap trace_page_fault
+#endif
+xen_pv_trap hypervisor_callback
hypercall_iret = hypercall_page + __HYPERVISOR_iret * 32
/*
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 0d5004477db6..18e8729d42bd 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -145,7 +145,6 @@ DECL_ASM(void, xen_restore_fl_direct, unsigned long);
__visible void xen_iret(void);
__visible void xen_sysret32(void);
__visible void xen_sysret64(void);
-__visible void xen_adjust_exception_frame(void);
extern int xen_panic_handler_init(void);
--
2.12.3