Commit 7b1333aa authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Thomas Gleixner
Browse files

xen: use hypercall rather than clts 



Xen will trap and emulate clts, but its better to use a hypercall.
Also, xenner doesn't handle clts.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 0922abdc

arch/x86/xen/enlighten.c

+26 −2
Original line number Diff line number Diff line
@@ -607,6 +607,30 @@ static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm, 
	xen_mc_issue(PARAVIRT_LAZY_MMU);

}



static void xen_clts(void)

{

	struct multicall_space mcs;



	mcs = xen_mc_entry(0);



	MULTI_fpu_taskswitch(mcs.mc, 0);



	xen_mc_issue(PARAVIRT_LAZY_CPU);

}



static void xen_write_cr0(unsigned long cr0)

{

	struct multicall_space mcs;



	/* Only pay attention to cr0.TS; everything else is

	   ignored. */

	mcs = xen_mc_entry(0);



	MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);



	xen_mc_issue(PARAVIRT_LAZY_CPU);

}



static void xen_write_cr2(unsigned long cr2)

{

	x86_read_percpu(xen_vcpu)->arch.cr2 = cr2;
@@ -978,10 +1002,10 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = { 
	.set_debugreg = xen_set_debugreg,

	.get_debugreg = xen_get_debugreg,



	.clts = native_clts,

	.clts = xen_clts,



	.read_cr0 = native_read_cr0,

	.write_cr0 = native_write_cr0,

	.write_cr0 = xen_write_cr0,



	.read_cr4 = native_read_cr4,

	.read_cr4_safe = native_read_cr4_safe,

include/asm-x86/xen/hypercall.h

+7 −0
Original line number Diff line number Diff line
@@ -314,6 +314,13 @@ HYPERVISOR_nmi_op(unsigned long op, unsigned long arg) 
	return _hypercall2(int, nmi_op, op, arg);

}



static inline void

MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)

{

	mcl->op = __HYPERVISOR_fpu_taskswitch;

	mcl->args[0] = set;

}



static inline void

MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,

			pte_t new_val, unsigned long flags)