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: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -607,6 +607,30 @@ static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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}
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static void xen_clts(void)
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{
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struct multicall_space mcs;
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mcs = xen_mc_entry(0);
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MULTI_fpu_taskswitch(mcs.mc, 0);
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xen_mc_issue(PARAVIRT_LAZY_CPU);
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}
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static void xen_write_cr0(unsigned long cr0)
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{
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struct multicall_space mcs;
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/* Only pay attention to cr0.TS; everything else is
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ignored. */
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mcs = xen_mc_entry(0);
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MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
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xen_mc_issue(PARAVIRT_LAZY_CPU);
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}
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static void xen_write_cr2(unsigned long cr2)
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{
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x86_read_percpu(xen_vcpu)->arch.cr2 = cr2;
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@ -978,10 +1002,10 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
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.set_debugreg = xen_set_debugreg,
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.get_debugreg = xen_get_debugreg,
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.clts = native_clts,
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.clts = xen_clts,
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.read_cr0 = native_read_cr0,
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.write_cr0 = native_write_cr0,
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.write_cr0 = xen_write_cr0,
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.read_cr4 = native_read_cr4,
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.read_cr4_safe = native_read_cr4_safe,
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@ -314,6 +314,13 @@ HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
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return _hypercall2(int, nmi_op, op, arg);
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}
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static inline void
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MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
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{
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mcl->op = __HYPERVISOR_fpu_taskswitch;
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mcl->args[0] = set;
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}
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static inline void
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MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
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pte_t new_val, unsigned long flags)
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