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KVM: MMU: Simplify fetch() a little bit

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Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-05-30 14:21:51 +03:00
parent d3d25b048b
commit ef0197e8d9
1 changed files with 17 additions and 17 deletions
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34
drivers/kvm/paging_tmpl.h
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@ -241,6 +241,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
{ {
hpa_t shadow_addr; hpa_t shadow_addr;
int level; int level;
u64 *shadow_ent;
u64 *prev_shadow_ent = NULL; u64 *prev_shadow_ent = NULL;
pt_element_t *guest_ent = walker->ptep; pt_element_t *guest_ent = walker->ptep;
@ -257,13 +258,13 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
for (; ; level--) { for (; ; level--) {
u32 index = SHADOW_PT_INDEX(addr, level); u32 index = SHADOW_PT_INDEX(addr, level);
u64 *shadow_ent = ((u64 *)__va(shadow_addr)) + index;
struct kvm_mmu_page *shadow_page; struct kvm_mmu_page *shadow_page;
u64 shadow_pte; u64 shadow_pte;
int metaphysical; int metaphysical;
gfn_t table_gfn; gfn_t table_gfn;
unsigned hugepage_access = 0; unsigned hugepage_access = 0;
shadow_ent = ((u64 *)__va(shadow_addr)) + index;
if (is_present_pte(*shadow_ent) || is_io_pte(*shadow_ent)) { if (is_present_pte(*shadow_ent) || is_io_pte(*shadow_ent)) {
if (level == PT_PAGE_TABLE_LEVEL) if (level == PT_PAGE_TABLE_LEVEL)
return shadow_ent; return shadow_ent;
@ -272,22 +273,8 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
continue; continue;
} }
if (level == PT_PAGE_TABLE_LEVEL) { if (level == PT_PAGE_TABLE_LEVEL)
break;
if (walker->level == PT_DIRECTORY_LEVEL) {
if (prev_shadow_ent)
*prev_shadow_ent |= PT_SHADOW_PS_MARK;
FNAME(set_pde)(vcpu, *guest_ent, shadow_ent,
walker->inherited_ar,
walker->gfn);
} else {
ASSERT(walker->level == PT_PAGE_TABLE_LEVEL);
FNAME(set_pte)(vcpu, *guest_ent, shadow_ent,
walker->inherited_ar,
walker->gfn);
}
return shadow_ent;
}
if (level - 1 == PT_PAGE_TABLE_LEVEL if (level - 1 == PT_PAGE_TABLE_LEVEL
&& walker->level == PT_DIRECTORY_LEVEL) { && walker->level == PT_DIRECTORY_LEVEL) {
@ -310,6 +297,19 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
*shadow_ent = shadow_pte; *shadow_ent = shadow_pte;
prev_shadow_ent = shadow_ent; prev_shadow_ent = shadow_ent;
} }
if (walker->level == PT_DIRECTORY_LEVEL) {
if (prev_shadow_ent)
*prev_shadow_ent |= PT_SHADOW_PS_MARK;
FNAME(set_pde)(vcpu, *guest_ent, shadow_ent,
walker->inherited_ar, walker->gfn);
} else {
ASSERT(walker->level == PT_PAGE_TABLE_LEVEL);
FNAME(set_pte)(vcpu, *guest_ent, shadow_ent,
walker->inherited_ar,
walker->gfn);
}
return shadow_ent;
} }
/* /*