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x86, xen, gdt: Remove the pvops variant of store_gdt.

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The two use-cases where we needed to store the GDT were during ACPI S3 suspend
and resume. As the patches:
 x86/gdt/i386: store/load GDT for ACPI S3 or hibernation/resume path is not needed
 x86/gdt/64-bit: store/load GDT for ACPI S3 or hibernate/resume path is not needed.

have demonstrated - there are other mechanism by which the GDT is
saved and reloaded during early resume path.

Hence we do not need to worry about the pvops call-chain for saving the
GDT and can and can eliminate it. The other areas where the store_gdt is
used are never going to be hit when running under the pvops platforms.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1365194544-14648-4-git-send-email-konrad.wilk@oracle.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-04-05 16:42:23 -04:00 committed by H. Peter Anvin
parent 84e70971e6
commit 357d122670
7 changed files with 4 additions and 10 deletions
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4
arch/x86/include/asm/paravirt.h
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@ -262,10 +262,6 @@ static inline void set_ldt(const void *addr, unsigned entries)
{
PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
}
static inline void store_gdt(struct desc_ptr *dtr)
{
PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
}
static inline void store_idt(struct desc_ptr *dtr)
{
PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);

2
arch/x86/include/asm/paravirt_types.h
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@ -122,7 +122,7 @@ struct pv_cpu_ops {
void (*load_tr_desc)(void);
void (*load_gdt)(const struct desc_ptr *);
void (*load_idt)(const struct desc_ptr *);
void (*store_gdt)(struct desc_ptr *);
/* store_gdt has been removed. */
void (*store_idt)(struct desc_ptr *);
void (*set_ldt)(const void *desc, unsigned entries);
unsigned long (*store_tr)(void);

2
arch/x86/kernel/acpi/sleep.c
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@ -46,7 +46,7 @@ int acpi_suspend_lowlevel(void)
header->pmode_behavior = 0;
#ifndef CONFIG_64BIT
store_gdt((struct desc_ptr *)&header->pmode_gdt);
native_store_gdt((struct desc_ptr *)&header->pmode_gdt);
if (!rdmsr_safe(MSR_EFER,
&header->pmode_efer_low,

2
arch/x86/kernel/doublefault_32.c
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@ -20,7 +20,7 @@ static void doublefault_fn(void)
struct desc_ptr gdt_desc = {0, 0};
unsigned long gdt, tss;
store_gdt(&gdt_desc);
native_store_gdt(&gdt_desc);
gdt = gdt_desc.address;
printk(KERN_EMERG "PANIC: double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size);

1
arch/x86/kernel/paravirt.c
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@ -360,7 +360,6 @@ struct pv_cpu_ops pv_cpu_ops = {
.set_ldt = native_set_ldt,
.load_gdt = native_load_gdt,
.load_idt = native_load_idt,
.store_gdt = native_store_gdt,
.store_idt = native_store_idt,
.store_tr = native_store_tr,
.load_tls = native_load_tls,

2
arch/x86/kvm/vmx.c
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@ -2459,7 +2459,7 @@ static int hardware_enable(void *garbage)
ept_sync_global();
}
store_gdt(&__get_cpu_var(host_gdt));
native_store_gdt(&__get_cpu_var(host_gdt));
return 0;
}

1
arch/x86/xen/enlighten.c
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@ -1220,7 +1220,6 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.alloc_ldt = xen_alloc_ldt,
.free_ldt = xen_free_ldt,
.store_gdt = native_store_gdt,
.store_idt = native_store_idt,
.store_tr = xen_store_tr,