Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit ab6ec39a authored by Lin Ming's avatar Lin Ming Committed by Konrad Rzeszutek Wilk
Browse files

xen/apic: implement io apic read with hypercall 



Implements xen_io_apic_read with hypercall, so it returns proper
IO-APIC information instead of fabricated one.

Fallback to return an emulated IO_APIC values if hypercall fails.

[v2: fallback to return an emulated IO_APIC values if hypercall fails]
Signed-off-by: default avatarLin Ming <mlin@ss.pku.edu.cn>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 27abd14b

arch/x86/xen/apic.c

+13 −0
Original line number Diff line number Diff line 
#include <linux/init.h>

#include <asm/x86_init.h>

#include <asm/apic.h>

#include <xen/interface/physdev.h>

#include <asm/xen/hypercall.h>



unsigned int xen_io_apic_read(unsigned apic, unsigned reg)

{

	struct physdev_apic apic_op;

	int ret;



	apic_op.apic_physbase = mpc_ioapic_addr(apic);

	apic_op.reg = reg;

	ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);

	if (!ret)

		return apic_op.value;



	/* fallback to return an emulated IO_APIC values */

	if (reg == 0x1)

		return 0x00170020;

	else if (reg == 0x0)