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xen64: register callbacks in arch-independent way

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Use callback_op hypercall to register callbacks in a 32/64-bit
independent way (64-bit doesn't need a code segment, but that detail
is hidden in XEN_CALLBACK).

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-07-08 15:07:02 -07:00 committed by Ingo Molnar
parent 952d1d7055
commit 88459d4c7e
2 changed files with 29 additions and 10 deletions
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27
arch/x86/xen/setup.c
View File

@ -91,19 +91,25 @@ static void __init fiddle_vdso(void)
*mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
}
void xen_enable_sysenter(void)
static __cpuinit int register_callback(unsigned type, const void *func)
{
int cpu = smp_processor_id();
extern void xen_sysenter_target(void);
/* Mask events on entry, even though they get enabled immediately */
static struct callback_register sysenter = {
.type = CALLBACKTYPE_sysenter,
.address = XEN_CALLBACK(__KERNEL_CS, xen_sysenter_target),
struct callback_register callback = {
.type = type,
.address = XEN_CALLBACK(__KERNEL_CS, func),
.flags = CALLBACKF_mask_events,
};
return HYPERVISOR_callback_op(CALLBACKOP_register, &callback);
}
void __cpuinit xen_enable_sysenter(void)
{
int cpu = smp_processor_id();
extern void xen_sysenter_target(void);
if (!boot_cpu_has(X86_FEATURE_SEP) ||
HYPERVISOR_callback_op(CALLBACKOP_register, &sysenter) != 0) {
register_callback(CALLBACKTYPE_sysenter,
xen_sysenter_target) != 0) {
clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP);
clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP);
}
@ -120,8 +126,9 @@ void __init xen_arch_setup(void)
if (!xen_feature(XENFEAT_auto_translated_physmap))
HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
__KERNEL_CS, (unsigned long)xen_failsafe_callback);
if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) ||
register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback))
BUG();
xen_enable_sysenter();

12
include/asm-x86/xen/hypercall.h
View File

@ -226,6 +226,7 @@ HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
return _hypercall2(int, stack_switch, ss, esp);
}
#ifdef CONFIG_X86_32
static inline int
HYPERVISOR_set_callbacks(unsigned long event_selector,
unsigned long event_address,
@ -236,6 +237,17 @@ HYPERVISOR_set_callbacks(unsigned long event_selector,
event_selector, event_address,
failsafe_selector, failsafe_address);
}
#else /* CONFIG_X86_64 */
static inline int
HYPERVISOR_set_callbacks(unsigned long event_address,
unsigned long failsafe_address,
unsigned long syscall_address)
{
return _hypercall3(int, set_callbacks,
event_address, failsafe_address,
syscall_address);
}
#endif /* CONFIG_X86_{32,64} */
static inline int
HYPERVISOR_callback_op(int cmd, void *arg)