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Code Issues Releases Wiki Activity

x86/xen: Make get_debugreg() noinstr

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vmlinux.o: warning: objtool: pv_ops[1]: xen_get_debugreg
vmlinux.o: warning: objtool: pv_ops[1]: native_get_debugreg
vmlinux.o: warning: objtool: exc_debug()+0x25: call to pv_ops[1]() leaves .noinstr.text section

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20210624095148.625523645@infradead.org
This commit is contained in:
Peter Zijlstra 2021-06-24 11:41:15 +02:00
parent 209cfd0cbb
commit f4afb713e5
4 changed files with 9 additions and 5 deletions
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2
arch/x86/include/asm/paravirt.h
View file

@ -113,7 +113,7 @@ static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
/*
* These special macros can be used to get or set a debugging register
*/
static inline unsigned long paravirt_get_debugreg(int reg)
static __always_inline unsigned long paravirt_get_debugreg(int reg)
{
return PVOP_CALL1(unsigned long, cpu.get_debugreg, reg);
}

2
arch/x86/include/asm/xen/hypercall.h
View file

@ -314,7 +314,7 @@ HYPERVISOR_set_debugreg(int reg, unsigned long value)
return _hypercall2(int, set_debugreg, reg, value);
}
static inline unsigned long
static __always_inline unsigned long
HYPERVISOR_get_debugreg(int reg)
{
return _hypercall1(unsigned long, get_debugreg, reg);

8
arch/x86/kernel/paravirt.c
View file

@ -228,6 +228,11 @@ static noinstr void pv_native_write_cr2(unsigned long val)
{
native_write_cr2(val);
}
static noinstr unsigned long pv_native_get_debugreg(int regno)
{
return native_get_debugreg(regno);
}
#endif
enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
@ -254,7 +259,7 @@ struct paravirt_patch_template pv_ops = {
#ifdef CONFIG_PARAVIRT_XXL
.cpu.cpuid = native_cpuid,
.cpu.get_debugreg = native_get_debugreg,
.cpu.get_debugreg = pv_native_get_debugreg,
.cpu.set_debugreg = native_set_debugreg,
.cpu.read_cr0 = native_read_cr0,
.cpu.write_cr0 = native_write_cr0,
@ -382,7 +387,6 @@ struct paravirt_patch_template pv_ops = {
#ifdef CONFIG_PARAVIRT_XXL
/* At this point, native_get/set_debugreg has real function entries */
NOKPROBE_SYMBOL(native_get_debugreg);
NOKPROBE_SYMBOL(native_set_debugreg);
NOKPROBE_SYMBOL(native_load_idt);

2
arch/x86/xen/enlighten_pv.c
View file

@ -316,7 +316,7 @@ static void xen_set_debugreg(int reg, unsigned long val)
HYPERVISOR_set_debugreg(reg, val);
}
static unsigned long xen_get_debugreg(int reg)
static noinstr unsigned long xen_get_debugreg(int reg)
{
return HYPERVISOR_get_debugreg(reg);
}