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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-05-26 23:31:01 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-27 10:11:35 +0200 |
| commit | 7b1333aa4cb546ddeb9c05098a53d9a777623a05 (patch) | |
| tree | 2ab9949f9f64da6ea9510985c45fa0f047545ec9 | |
| parent | 0922abdc3982ae54cbe1b24ac5aa91a260eca1bb (diff) | |
| download | blackbird-op-linux-7b1333aa4cb546ddeb9c05098a53d9a777623a05.tar.gz blackbird-op-linux-7b1333aa4cb546ddeb9c05098a53d9a777623a05.zip | |
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>
| -rw-r--r-- | arch/x86/xen/enlighten.c | 28 | ||||
| -rw-r--r-- | include/asm-x86/xen/hypercall.h | 7 |
2 files changed, 33 insertions, 2 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index a05b7721bc81..446f4cd649e6 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -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, diff --git a/include/asm-x86/xen/hypercall.h b/include/asm-x86/xen/hypercall.h index c2ccd997ed35..897ff79cca3b 100644 --- a/include/asm-x86/xen/hypercall.h +++ b/include/asm-x86/xen/hypercall.h @@ -315,6 +315,13 @@ HYPERVISOR_nmi_op(unsigned long op, unsigned long 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) { |
