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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>
This commit is contained in:
Jeremy Fitzhardinge 2008-05-26 23:31:01 +01:00 committed by Thomas Gleixner
parent 0922abdc39
commit 7b1333aa4c
2 changed files with 33 additions and 2 deletions
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28
arch/x86/xen/enlighten.c
View File

@ -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,

7
include/asm-x86/xen/hypercall.h
View File

@ -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)