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xen: lazy-mmu operations

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This patch uses the lazy-mmu hooks to batch mmu operations where
possible.  This is primarily useful for batching operations applied to
active pagetables, which happens during mprotect, munmap, mremap and
the like (mmap does not do bulk pagetable operations, so it isn't
helped).

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>
This commit is contained in:
Jeremy Fitzhardinge
2007-07-17 18:37:06 -07:00
committed by Jeremy Fitzhardinge
parent f120f13ea0
commit d66bf8fcf3
3 changed files with 72 additions and 32 deletions
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48
arch/i386/xen/enlighten.c
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@@ -472,28 +472,38 @@ static void xen_apic_write(unsigned long reg, unsigned long val)
static void xen_flush_tlb(void)
{
struct mmuext_op op;
struct mmuext_op *op;
struct multicall_space mcs = xen_mc_entry(sizeof(*op));
op.cmd = MMUEXT_TLB_FLUSH_LOCAL;
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
BUG();
op = mcs.args;
op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
static void xen_flush_tlb_single(unsigned long addr)
{
struct mmuext_op op;
struct mmuext_op *op;
struct multicall_space mcs = xen_mc_entry(sizeof(*op));
op.cmd = MMUEXT_INVLPG_LOCAL;
op.arg1.linear_addr = addr & PAGE_MASK;
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
BUG();
op = mcs.args;
op->cmd = MMUEXT_INVLPG_LOCAL;
op->arg1.linear_addr = addr & PAGE_MASK;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
unsigned long va)
{
struct mmuext_op op;
struct {
struct mmuext_op op;
cpumask_t mask;
} *args;
cpumask_t cpumask = *cpus;
struct multicall_space mcs;
/*
* A couple of (to be removed) sanity checks:
@@ -510,17 +520,21 @@ static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
if (cpus_empty(cpumask))
return;
mcs = xen_mc_entry(sizeof(*args));
args = mcs.args;
args->mask = cpumask;
args->op.arg2.vcpumask = &args->mask;
if (va == TLB_FLUSH_ALL) {
op.cmd = MMUEXT_TLB_FLUSH_MULTI;
op.arg2.vcpumask = (void *)cpus;
args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
} else {
op.cmd = MMUEXT_INVLPG_MULTI;
op.arg1.linear_addr = va;
op.arg2.vcpumask = (void *)cpus;
args->op.cmd = MMUEXT_INVLPG_MULTI;
args->op.arg1.linear_addr = va;
}
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
BUG();
MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
static unsigned long xen_read_cr2(void)