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KVM: MMU: Eliminate redundant temporaries in FNAME(fetch) 

'level' and 'sptep' are aliases for 'interator.level' and 'iterator.sptep', no
need for them.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2010-07-13 14:27:11 +03:00
parent 5991b33237
commit 24157aaf83
1 changed files with 24 additions and 35 deletions
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59
arch/x86/kvm/paging_tmpl.h
View File

@ -320,12 +320,10 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
{ {
unsigned access = gw->pt_access; unsigned access = gw->pt_access;
struct kvm_mmu_page *sp = NULL; struct kvm_mmu_page *sp = NULL;
u64 *sptep = NULL;
int uninitialized_var(level);
bool dirty = is_dirty_gpte(gw->ptes[gw->level - 1]); bool dirty = is_dirty_gpte(gw->ptes[gw->level - 1]);
int top_level; int top_level;
unsigned direct_access; unsigned direct_access;
struct kvm_shadow_walk_iterator iterator; struct kvm_shadow_walk_iterator it;
if (!is_present_gpte(gw->ptes[gw->level - 1])) if (!is_present_gpte(gw->ptes[gw->level - 1]))
return NULL; return NULL;
@ -346,68 +344,59 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
if (FNAME(gpte_changed)(vcpu, gw, top_level)) if (FNAME(gpte_changed)(vcpu, gw, top_level))
goto out_gpte_changed; goto out_gpte_changed;
for (shadow_walk_init(&iterator, vcpu, addr); for (shadow_walk_init(&it, vcpu, addr);
shadow_walk_okay(&iterator) && iterator.level > gw->level; shadow_walk_okay(&it) && it.level > gw->level;
shadow_walk_next(&iterator)) { shadow_walk_next(&it)) {
gfn_t table_gfn; gfn_t table_gfn;
level = iterator.level; drop_large_spte(vcpu, it.sptep);
sptep = iterator.sptep;
drop_large_spte(vcpu, sptep);
sp = NULL; sp = NULL;
if (!is_shadow_present_pte(*sptep)) { if (!is_shadow_present_pte(*it.sptep)) {
table_gfn = gw->table_gfn[level - 2]; table_gfn = gw->table_gfn[it.level - 2];
sp = kvm_mmu_get_page(vcpu, table_gfn, addr, level-1, sp = kvm_mmu_get_page(vcpu, table_gfn, addr, it.level-1,
false, access, sptep); false, access, it.sptep);
} }
/* /*
* Verify that the gpte in the page we've just write * Verify that the gpte in the page we've just write
* protected is still there. * protected is still there.
*/ */
if (FNAME(gpte_changed)(vcpu, gw, level - 1)) if (FNAME(gpte_changed)(vcpu, gw, it.level - 1))
goto out_gpte_changed; goto out_gpte_changed;
if (sp) if (sp)
link_shadow_page(sptep, sp); link_shadow_page(it.sptep, sp);
} }
for (; for (;
shadow_walk_okay(&iterator) && iterator.level > hlevel; shadow_walk_okay(&it) && it.level > hlevel;
shadow_walk_next(&iterator)) { shadow_walk_next(&it)) {
gfn_t direct_gfn; gfn_t direct_gfn;
level = iterator.level; validate_direct_spte(vcpu, it.sptep, direct_access);
sptep = iterator.sptep;
validate_direct_spte(vcpu, sptep, direct_access); drop_large_spte(vcpu, it.sptep);
drop_large_spte(vcpu, sptep); if (is_shadow_present_pte(*it.sptep))
if (is_shadow_present_pte(*sptep))
continue; continue;
direct_gfn = gw->gfn & ~(KVM_PAGES_PER_HPAGE(level) - 1); direct_gfn = gw->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1);
sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, level-1, sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, it.level-1,
true, direct_access, sptep); true, direct_access, it.sptep);
link_shadow_page(sptep, sp); link_shadow_page(it.sptep, sp);
} }
sptep = iterator.sptep; mmu_set_spte(vcpu, it.sptep, access, gw->pte_access & access,
level = iterator.level; user_fault, write_fault, dirty, ptwrite, it.level,
mmu_set_spte(vcpu, sptep, access, gw->pte_access & access,
user_fault, write_fault, dirty, ptwrite, level,
gw->gfn, pfn, false, true); gw->gfn, pfn, false, true);
return sptep; return it.sptep;
out_gpte_changed: out_gpte_changed:
if (sp) if (sp)
kvm_mmu_put_page(sp, sptep); kvm_mmu_put_page(sp, it.sptep);
kvm_release_pfn_clean(pfn); kvm_release_pfn_clean(pfn);
return NULL; return NULL;
} }