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x86/kexec: Set_[gi]dt() -> native_[gi]dt_invalidate() in machine_kexec_*.c 

These files contain private set_gdt() functions which are only used to
invalid the gdt; machine_kexec_64.c also contains a set_idt()
function to invalidate the idt.

phys_to_virt(0) *really* doesn't make any sense for creating an
invalid GDT. A NULL pointer (virtual 0) makes a lot more sense;
although neither will allow any actual memory reference, a NULL
pointer stands out more.

Replace these calls with native_[gi]dt_invalidate().

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210519212154.511983-7-hpa@zytor.com
This commit is contained in:
H. Peter Anvin (Intel) 2021-05-19 14:21:52 -07:00 committed by Thomas Gleixner
parent 283fa3b648
commit 056c52f5e8
2 changed files with 4 additions and 44 deletions
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15
arch/x86/kernel/machine_kexec_32.c
View File

@ -23,17 +23,6 @@
#include <asm/set_memory.h>
#include <asm/debugreg.h>
static void set_gdt(void *newgdt, __u16 limit)
{
struct desc_ptr curgdt;
/* ia32 supports unaligned loads & stores */
curgdt.size = limit;
curgdt.address = (unsigned long)newgdt;
load_gdt(&curgdt);
}
static void load_segments(void)
{
#define __STR(X) #X
@ -232,8 +221,8 @@ void machine_kexec(struct kimage *image)
* The gdt & idt are now invalid.
* If you want to load them you must set up your own idt & gdt.
*/
idt_invalidate();
set_gdt(phys_to_virt(0), 0);
native_idt_invalidate();
native_gdt_invalidate();
/* now call it */
image->start = relocate_kernel_ptr((unsigned long)image->head,

33
arch/x86/kernel/machine_kexec_64.c
View File

@ -256,35 +256,6 @@ static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
return init_transition_pgtable(image, level4p);
}
static void set_idt(void *newidt, u16 limit)
{
struct desc_ptr curidt;
/* x86-64 supports unaligned loads & stores */
curidt.size = limit;
curidt.address = (unsigned long)newidt;
__asm__ __volatile__ (
"lidtq %0\n"
: : "m" (curidt)
);
};
static void set_gdt(void *newgdt, u16 limit)
{
struct desc_ptr curgdt;
/* x86-64 supports unaligned loads & stores */
curgdt.size = limit;
curgdt.address = (unsigned long)newgdt;
__asm__ __volatile__ (
"lgdtq %0\n"
: : "m" (curgdt)
);
};
static void load_segments(void)
{
__asm__ __volatile__ (
@ -379,8 +350,8 @@ void machine_kexec(struct kimage *image)
* The gdt & idt are now invalid.
* If you want to load them you must set up your own idt & gdt.
*/
set_gdt(phys_to_virt(0), 0);
set_idt(phys_to_virt(0), 0);
native_idt_invalidate();
native_gdt_invalidate();
/* now call it */
image->start = relocate_kernel((unsigned long)image->head,