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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-02-17 23:46:21 -0800
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2009-03-29 23:36:00 -0700
commitb407fc57b815b2016186220baabc76cc8264206e (patch)
tree29949f727af8b6c19fd689fa10f123ea84c03cb0 /arch/x86/xen
parent7fd7d83d49914f03aefffba6aee09032fcd54cce (diff)
x86/paravirt: flush pending mmu updates on context switch
Impact: allow preemption during lazy mmu updates If we're in lazy mmu mode when context switching, leave lazy mmu mode, but remember the task's state in TIF_LAZY_MMU_UPDATES. When we resume the task, check this flag and re-enter lazy mmu mode if its set. This sets things up for allowing lazy mmu mode while preemptible, though that won't actually be active until the next change. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Diffstat (limited to 'arch/x86/xen')
-rw-r--r--arch/x86/xen/enlighten.c6
-rw-r--r--arch/x86/xen/mmu.c7
-rw-r--r--arch/x86/xen/xen-ops.h1
3 files changed, 9 insertions, 5 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 82cd39a6cbd..f586e63b9a6 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -203,10 +203,10 @@ static unsigned long xen_get_debugreg(int reg)
return HYPERVISOR_get_debugreg(reg);
}
-void xen_leave_lazy(void)
+static void xen_leave_lazy_cpu(void)
{
- paravirt_leave_lazy(paravirt_get_lazy_mode());
xen_mc_flush();
+ paravirt_leave_lazy_cpu();
}
static unsigned long xen_store_tr(void)
@@ -819,7 +819,7 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
.lazy_mode = {
.enter = paravirt_enter_lazy_cpu,
- .leave = xen_leave_lazy,
+ .leave = xen_leave_lazy_cpu,
},
};
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 6b98f87232a..f5f8faa4f76 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1816,6 +1816,11 @@ __init void xen_post_allocator_init(void)
xen_mark_init_mm_pinned();
}
+static void xen_leave_lazy_mmu(void)
+{
+ xen_mc_flush();
+ paravirt_leave_lazy_mmu();
+}
const struct pv_mmu_ops xen_mmu_ops __initdata = {
.pagetable_setup_start = xen_pagetable_setup_start,
@@ -1891,7 +1896,7 @@ const struct pv_mmu_ops xen_mmu_ops __initdata = {
.lazy_mode = {
.enter = paravirt_enter_lazy_mmu,
- .leave = xen_leave_lazy,
+ .leave = xen_leave_lazy_mmu,
},
.set_fixmap = xen_set_fixmap,
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 2f5ef2632ea..f897cdffccb 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -30,7 +30,6 @@ pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
void xen_ident_map_ISA(void);
void xen_reserve_top(void);
-void xen_leave_lazy(void);
void xen_post_allocator_init(void);
char * __init xen_memory_setup(void);