[PATCH 10/15] xen/mmu: use extend_args for more mmuext updates

Jeremy Fitzhardinge
2011-06-20T22:15:42Z

arch/x86/xen/mmu.c | 42 +++++++++++++++++++++++++++---------------
1 files changed, 27 insertions(+), 15 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index ad8a226..112259f 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -228,6 +228,24 @@ static void xen_extend_mmu_update(const struct mmu_update *update)
*u = *update;
}

+static void xen_extend_mmuext_op(const struct mmuext_op *op)
+{
+ struct multicall_space mcs;
+ struct mmuext_op *u;
+
+ mcs = xen_mc_extend_args(__HYPERVISOR_mmuext_op, sizeof(*u));
+
+ if (mcs.mc != NULL) {
+ mcs.mc->args[1]++;
+ } else {
+ mcs = __xen_mc_entry(sizeof(*u));
+ MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
+ }
+
+ u = mcs.args;
+ *u = *op;
+}
+
static void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
{
struct mmu_update u;
@@ -809,14 +827,12 @@ static void xen_pte_unlock(void *v)

static void xen_do_pin(unsigned level, unsigned long pfn)
{
- struct mmuext_op *op;
- struct multicall_space mcs;
+ struct mmuext_op op;

- mcs = __xen_mc_entry(sizeof(*op));
- op = mcs.args;
- op->cmd = level;
- op->arg1.mfn = pfn_to_mfn(pfn);
- MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
+ op.cmd = level;
+ op.arg1.mfn = pfn_to_mfn(pfn);
+
+ xen_extend_mmuext_op(&op);
}

static int xen_pin_page(struct mm_struct *mm, struct page *page,
@@ -1302,8 +1318,7 @@ static void set_current_cr3(void *v)

static void __xen_write_cr3(bool kernel, unsigned long cr3)
{
- struct mmuext_op *op;
- struct multicall_space mcs;
+ struct mmuext_op op;
unsigned long mfn;

trace_xen_mmu_write_cr3(kernel, cr3);
@@ -1315,13 +1330,10 @@ static void __xen_write_cr3(bool kernel, unsigned long cr3)

WARN_ON(mfn == 0 && kernel);

- mcs = __xen_mc_entry(sizeof(*op));
+ op.cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
+ op.arg1.mfn = mfn;

- op = mcs.args;
- op->cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
- op->arg1.mfn = mfn;
-
- MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
+ xen_extend_mmuext_op(&op);

if (kernel) {
percpu_write(xen_cr3, cr3);
--
1.7.5.4