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Check xgetbv availability before use for machines without it (i.e. KVM)

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This commit is contained in:
Masamichi Takagi
2017-09-26 19:31:34 +09:00
parent 37e3118df6
commit 79b977ac06
1 changed files with 9 additions and 12 deletions
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13
arch/x86/kernel/cpu.c
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@ -1473,29 +1473,28 @@ void ihk_mc_delay_us(int us)
arch_delay(us);
}
#define EXTENDED_ARCH_SHOW_CONTEXT
#ifdef EXTENDED_ARCH_SHOW_CONTEXT
void arch_show_extended_context(void)
{
unsigned long cr0, cr4, msr, xcr0;
unsigned long cr0, cr4, msr, xcr0 = 0;
/* Read and print CRs, MSR_EFER, XCR0 */
asm volatile("movq %%cr0, %0" : "=r"(cr0));
asm volatile("movq %%cr4, %0" : "=r"(cr4));
msr = rdmsr(MSR_EFER);
if (xsave_available) {
xcr0 = xgetbv(0);
}
__kprintf("\n CR0 CR4\n");
__kprintf("%016lX %016lX\n", cr0, cr4);
__kprintf(" MSR_EFER\n");
__kprintf("%016lX\n", msr);
if (xsave_available) {
__kprintf(" XCR0\n");
__kprintf("%016lX\n", xcr0);
}
#endif
}
/*@
@ requires \valid(reg);
@ -1526,9 +1525,7 @@ void arch_show_interrupt_context(const void *reg)
__kprintf("%16lx %16lx %16lx %16lx\n",
regs->cs, regs->ss, regs->rflags, regs->error);
#ifdef EXTENDED_ARCH_SHOW_CONTEXT
arch_show_extended_context();
#endif
kprintf_unlock(irqflags);
}