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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86 fpu: Code clean up. Eliminate per-cpu xsave init verbosity.
# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1294996288 0
# Node ID 58304c1cc725e6ef5947aded0bee3b11f0a0dd4e
# Parent 4b7cb21caf0e114c5f6ef8a74c17ca799873e83b
x86 fpu: Code clean up. Eliminate per-cpu xsave init verbosity.
Signed-off-by: Keir Fraser <keir@xxxxxxx>
---
xen/arch/x86/acpi/suspend.c | 3 -
xen/arch/x86/domain.c | 2
xen/arch/x86/i387.c | 126 ++++++++++++++++++++++++++++----------------
xen/include/asm-x86/i387.h | 48 ----------------
4 files changed, 84 insertions(+), 95 deletions(-)
diff -r 4b7cb21caf0e -r 58304c1cc725 xen/arch/x86/acpi/suspend.c
--- a/xen/arch/x86/acpi/suspend.c Fri Jan 14 08:34:53 2011 +0000
+++ b/xen/arch/x86/acpi/suspend.c Fri Jan 14 09:11:28 2011 +0000
@@ -24,8 +24,7 @@ static uint16_t saved_segs[4];
void save_rest_processor_state(void)
{
- if ( !is_idle_vcpu(current) )
- unlazy_fpu(current);
+ save_init_fpu(current);
#if defined(CONFIG_X86_64)
asm volatile (
diff -r 4b7cb21caf0e -r 58304c1cc725 xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Fri Jan 14 08:34:53 2011 +0000
+++ b/xen/arch/x86/domain.c Fri Jan 14 09:11:28 2011 +0000
@@ -1384,7 +1384,7 @@ static void __context_switch(void)
memcpy(&p->arch.guest_context.user_regs,
stack_regs,
CTXT_SWITCH_STACK_BYTES);
- unlazy_fpu(p);
+ save_init_fpu(p);
p->arch.ctxt_switch_from(p);
}
diff -r 4b7cb21caf0e -r 58304c1cc725 xen/arch/x86/i387.c
--- a/xen/arch/x86/i387.c Fri Jan 14 08:34:53 2011 +0000
+++ b/xen/arch/x86/i387.c Fri Jan 14 09:11:28 2011 +0000
@@ -16,6 +16,49 @@
#include <asm/i387.h>
#include <asm/asm_defns.h>
+static bool_t __read_mostly cpu_has_xsaveopt;
+
+static void xsave(struct vcpu *v)
+{
+ struct xsave_struct *ptr = v->arch.xsave_area;
+
+ asm volatile (
+ ".byte " REX_PREFIX "0x0f,0xae,0x27"
+ :
+ : "a" (-1), "d" (-1), "D"(ptr)
+ : "memory" );
+}
+
+static void xsaveopt(struct vcpu *v)
+{
+ struct xsave_struct *ptr = v->arch.xsave_area;
+
+ asm volatile (
+ ".byte " REX_PREFIX "0x0f,0xae,0x37"
+ :
+ : "a" (-1), "d" (-1), "D"(ptr)
+ : "memory" );
+}
+
+static void xrstor(struct vcpu *v)
+{
+ struct xsave_struct *ptr = v->arch.xsave_area;
+
+ asm volatile (
+ ".byte " REX_PREFIX "0x0f,0xae,0x2f"
+ :
+ : "m" (*ptr), "a" (-1), "d" (-1), "D"(ptr) );
+}
+
+static void load_mxcsr(unsigned long val)
+{
+ val &= 0xffbf;
+ asm volatile ( "ldmxcsr %0" : : "m" (val) );
+}
+
+static void init_fpu(void);
+static void restore_fpu(struct vcpu *v);
+
void setup_fpu(struct vcpu *v)
{
ASSERT(!is_idle_vcpu(v));
@@ -23,46 +66,51 @@ void setup_fpu(struct vcpu *v)
/* Avoid recursion. */
clts();
- if ( !v->fpu_dirtied )
- {
- v->fpu_dirtied = 1;
- if ( cpu_has_xsave )
- {
- if ( !v->fpu_initialised )
- v->fpu_initialised = 1;
-
- /* XCR0 normally represents what guest OS set. In case of Xen
- * itself, we set all supported feature mask before doing
- * save/restore.
- */
- set_xcr0(v->arch.xcr0_accum);
- xrstor(v);
- set_xcr0(v->arch.xcr0);
- }
- else
- {
- if ( v->fpu_initialised )
- restore_fpu(v);
- else
- init_fpu();
- }
- }
-}
-
-void init_fpu(void)
+ if ( v->fpu_dirtied )
+ return;
+
+ if ( cpu_has_xsave )
+ {
+ /*
+ * XCR0 normally represents what guest OS set. In case of Xen itself,
+ * we set all supported feature mask before doing save/restore.
+ */
+ set_xcr0(v->arch.xcr0_accum);
+ xrstor(v);
+ set_xcr0(v->arch.xcr0);
+ }
+ else if ( v->fpu_initialised )
+ {
+ restore_fpu(v);
+ }
+ else
+ {
+ init_fpu();
+ }
+
+ v->fpu_initialised = 1;
+ v->fpu_dirtied = 1;
+}
+
+static void init_fpu(void)
{
asm volatile ( "fninit" );
if ( cpu_has_xmm )
load_mxcsr(0x1f80);
- current->fpu_initialised = 1;
}
void save_init_fpu(struct vcpu *v)
{
- unsigned long cr0 = read_cr0();
- char *fpu_ctxt = v->arch.guest_context.fpu_ctxt.x;
+ unsigned long cr0;
+ char *fpu_ctxt;
+
+ if ( !v->fpu_dirtied )
+ return;
ASSERT(!is_idle_vcpu(v));
+
+ cr0 = read_cr0();
+ fpu_ctxt = v->arch.guest_context.fpu_ctxt.x;
/* This can happen, if a paravirtualised guest OS has set its CR0.TS. */
if ( cr0 & X86_CR0_TS )
@@ -126,7 +174,7 @@ void save_init_fpu(struct vcpu *v)
write_cr0(cr0|X86_CR0_TS);
}
-void restore_fpu(struct vcpu *v)
+static void restore_fpu(struct vcpu *v)
{
char *fpu_ctxt = v->arch.guest_context.fpu_ctxt.x;
@@ -188,29 +236,19 @@ u64 xfeature_mask;
/* Cached xcr0 for fast read */
DEFINE_PER_CPU(uint64_t, xcr0);
-bool_t __read_mostly cpu_has_xsaveopt;
-
void xsave_init(void)
{
u32 eax, ebx, ecx, edx;
int cpu = smp_processor_id();
u32 min_size;
- if ( boot_cpu_data.cpuid_level < XSTATE_CPUID ) {
- printk(XENLOG_ERR "XSTATE_CPUID missing\n");
+ if ( boot_cpu_data.cpuid_level < XSTATE_CPUID )
return;
- }
cpuid_count(XSTATE_CPUID, 0, &eax, &ebx, &ecx, &edx);
- printk("%s: cpu%d: cntxt_max_size: 0x%x and states: %08x:%08x\n",
- __func__, cpu, ecx, edx, eax);
-
- if ( ((eax & XSTATE_FP_SSE) != XSTATE_FP_SSE) ||
- ((eax & XSTATE_YMM) && !(eax & XSTATE_SSE)) )
- {
- BUG();
- }
+ BUG_ON((eax & XSTATE_FP_SSE) != XSTATE_FP_SSE);
+ BUG_ON((eax & XSTATE_YMM) && !(eax & XSTATE_SSE));
/* FP/SSE, XSAVE.HEADER, YMM */
min_size = XSAVE_AREA_MIN_SIZE;
diff -r 4b7cb21caf0e -r 58304c1cc725 xen/include/asm-x86/i387.h
--- a/xen/include/asm-x86/i387.h Fri Jan 14 08:34:53 2011 +0000
+++ b/xen/include/asm-x86/i387.h Fri Jan 14 09:11:28 2011 +0000
@@ -16,7 +16,6 @@
extern unsigned int xsave_cntxt_size;
extern u64 xfeature_mask;
-extern bool_t cpu_has_xsaveopt;
void xsave_init(void);
int xsave_alloc_save_area(struct vcpu *v);
@@ -75,54 +74,7 @@ static inline uint64_t get_xcr0(void)
return this_cpu(xcr0);
}
-static inline void xsave(struct vcpu *v)
-{
- struct xsave_struct *ptr;
-
- ptr =(struct xsave_struct *)v->arch.xsave_area;
-
- asm volatile (".byte " REX_PREFIX "0x0f,0xae,0x27"
- :
- : "a" (-1), "d" (-1), "D"(ptr)
- : "memory");
-}
-
-static inline void xsaveopt(struct vcpu *v)
-{
- struct xsave_struct *ptr;
-
- ptr =(struct xsave_struct *)v->arch.xsave_area;
-
- asm volatile (".byte " REX_PREFIX "0x0f,0xae,0x37"
- :
- : "a" (-1), "d" (-1), "D"(ptr)
- : "memory");
-}
-
-static inline void xrstor(struct vcpu *v)
-{
- struct xsave_struct *ptr;
-
- ptr =(struct xsave_struct *)v->arch.xsave_area;
-
- asm volatile (".byte " REX_PREFIX "0x0f,0xae,0x2f"
- :
- : "m" (*ptr), "a" (-1), "d" (-1), "D"(ptr));
-}
-
extern void setup_fpu(struct vcpu *v);
-extern void init_fpu(void);
extern void save_init_fpu(struct vcpu *v);
-extern void restore_fpu(struct vcpu *v);
-
-#define unlazy_fpu(v) do { \
- if ( (v)->fpu_dirtied ) \
- save_init_fpu(v); \
-} while ( 0 )
-
-#define load_mxcsr(val) do { \
- unsigned long __mxcsr = ((unsigned long)(val) & 0xffbf); \
- __asm__ __volatile__ ( "ldmxcsr %0" : : "m" (__mxcsr) ); \
-} while ( 0 )
#endif /* __ASM_I386_I387_H */
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