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Subject[PATCH 49/54] KVM: MMU: Move set_pte() into guest paging mode independent code
Date
As set_pte() no longer references either a gpte or the guest walker, we can
move it out of paging mode dependent code (which compiles twice and is
generally nasty).

Signed-off-by: Avi Kivity <avi@qumranet.com>
---
drivers/kvm/mmu.c | 83 ++++++++++++++++++++++++++++++++++++++++
drivers/kvm/paging_tmpl.h | 93 ++------------------------------------------
2 files changed, 88 insertions(+), 88 deletions(-)

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index cace1e4..a91e05b 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -879,6 +879,89 @@ struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva)
return gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
}

+static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
+ unsigned pt_access, unsigned pte_access,
+ int user_fault, int write_fault, int dirty,
+ int *ptwrite, gfn_t gfn)
+{
+ u64 spte;
+ int was_rmapped = is_rmap_pte(*shadow_pte);
+ struct page *page;
+
+ pgprintk("%s: spte %llx gpte %llx access %x write_fault %d"
+ " user_fault %d gfn %lx\n",
+ __FUNCTION__, *shadow_pte, (u64)gpte, pt_access,
+ write_fault, user_fault, gfn);
+
+ /*
+ * We don't set the accessed bit, since we sometimes want to see
+ * whether the guest actually used the pte (in order to detect
+ * demand paging).
+ */
+ spte = PT_PRESENT_MASK | PT_DIRTY_MASK;
+ if (!dirty)
+ pte_access &= ~ACC_WRITE_MASK;
+ if (!(pte_access & ACC_EXEC_MASK))
+ spte |= PT64_NX_MASK;
+
+ page = gfn_to_page(vcpu->kvm, gfn);
+
+ spte |= PT_PRESENT_MASK;
+ if (pte_access & ACC_USER_MASK)
+ spte |= PT_USER_MASK;
+
+ if (is_error_page(page)) {
+ set_shadow_pte(shadow_pte,
+ shadow_trap_nonpresent_pte | PT_SHADOW_IO_MARK);
+ kvm_release_page_clean(page);
+ return;
+ }
+
+ spte |= page_to_phys(page);
+
+ if ((pte_access & ACC_WRITE_MASK)
+ || (write_fault && !is_write_protection(vcpu) && !user_fault)) {
+ struct kvm_mmu_page *shadow;
+
+ spte |= PT_WRITABLE_MASK;
+ if (user_fault) {
+ mmu_unshadow(vcpu->kvm, gfn);
+ goto unshadowed;
+ }
+
+ shadow = kvm_mmu_lookup_page(vcpu->kvm, gfn);
+ if (shadow) {
+ pgprintk("%s: found shadow page for %lx, marking ro\n",
+ __FUNCTION__, gfn);
+ pte_access &= ~ACC_WRITE_MASK;
+ if (is_writeble_pte(spte)) {
+ spte &= ~PT_WRITABLE_MASK;
+ kvm_x86_ops->tlb_flush(vcpu);
+ }
+ if (write_fault)
+ *ptwrite = 1;
+ }
+ }
+
+unshadowed:
+
+ if (pte_access & ACC_WRITE_MASK)
+ mark_page_dirty(vcpu->kvm, gfn);
+
+ pgprintk("%s: setting spte %llx\n", __FUNCTION__, spte);
+ set_shadow_pte(shadow_pte, spte);
+ page_header_update_slot(vcpu->kvm, shadow_pte, gfn);
+ if (!was_rmapped) {
+ rmap_add(vcpu, shadow_pte, gfn);
+ if (!is_rmap_pte(*shadow_pte))
+ kvm_release_page_clean(page);
+ }
+ else
+ kvm_release_page_clean(page);
+ if (!ptwrite || !*ptwrite)
+ vcpu->last_pte_updated = shadow_pte;
+}
+
static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
{
}
diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index 2e5a80a..3ab3fb6 100644
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -235,89 +235,6 @@ err:
return 0;
}

-static void FNAME(set_pte)(struct kvm_vcpu *vcpu, u64 *shadow_pte,
- unsigned pt_access, unsigned pte_access,
- int user_fault, int write_fault, int dirty,
- int *ptwrite, gfn_t gfn)
-{
- u64 spte;
- int was_rmapped = is_rmap_pte(*shadow_pte);
- struct page *page;
-
- pgprintk("%s: spte %llx gpte %llx access %x write_fault %d"
- " user_fault %d gfn %lx\n",
- __FUNCTION__, *shadow_pte, (u64)gpte, pt_access,
- write_fault, user_fault, gfn);
-
- /*
- * We don't set the accessed bit, since we sometimes want to see
- * whether the guest actually used the pte (in order to detect
- * demand paging).
- */
- spte = PT_PRESENT_MASK | PT_DIRTY_MASK;
- if (!dirty)
- pte_access &= ~ACC_WRITE_MASK;
- if (!(pte_access & ACC_EXEC_MASK))
- spte |= PT64_NX_MASK;
-
- page = gfn_to_page(vcpu->kvm, gfn);
-
- spte |= PT_PRESENT_MASK;
- if (pte_access & ACC_USER_MASK)
- spte |= PT_USER_MASK;
-
- if (is_error_page(page)) {
- set_shadow_pte(shadow_pte,
- shadow_trap_nonpresent_pte | PT_SHADOW_IO_MARK);
- kvm_release_page_clean(page);
- return;
- }
-
- spte |= page_to_phys(page);
-
- if ((pte_access & ACC_WRITE_MASK)
- || (write_fault && !is_write_protection(vcpu) && !user_fault)) {
- struct kvm_mmu_page *shadow;
-
- spte |= PT_WRITABLE_MASK;
- if (user_fault) {
- mmu_unshadow(vcpu->kvm, gfn);
- goto unshadowed;
- }
-
- shadow = kvm_mmu_lookup_page(vcpu->kvm, gfn);
- if (shadow) {
- pgprintk("%s: found shadow page for %lx, marking ro\n",
- __FUNCTION__, gfn);
- pte_access &= ~ACC_WRITE_MASK;
- if (is_writeble_pte(spte)) {
- spte &= ~PT_WRITABLE_MASK;
- kvm_x86_ops->tlb_flush(vcpu);
- }
- if (write_fault)
- *ptwrite = 1;
- }
- }
-
-unshadowed:
-
- if (pte_access & ACC_WRITE_MASK)
- mark_page_dirty(vcpu->kvm, gfn);
-
- pgprintk("%s: setting spte %llx\n", __FUNCTION__, spte);
- set_shadow_pte(shadow_pte, spte);
- page_header_update_slot(vcpu->kvm, shadow_pte, gfn);
- if (!was_rmapped) {
- rmap_add(vcpu, shadow_pte, gfn);
- if (!is_rmap_pte(*shadow_pte))
- kvm_release_page_clean(page);
- }
- else
- kvm_release_page_clean(page);
- if (!ptwrite || !*ptwrite)
- vcpu->last_pte_updated = shadow_pte;
-}
-
static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
u64 *spte, const void *pte, int bytes,
int offset_in_pte)
@@ -335,8 +252,8 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
return;
pgprintk("%s: gpte %llx spte %p\n", __FUNCTION__, (u64)gpte, spte);
pte_access = page->role.access & FNAME(gpte_access)(vcpu, gpte);
- FNAME(set_pte)(vcpu, spte, page->role.access, pte_access, 0, 0,
- gpte & PT_DIRTY_MASK, NULL, gpte_to_gfn(gpte));
+ mmu_set_spte(vcpu, spte, page->role.access, pte_access, 0, 0,
+ gpte & PT_DIRTY_MASK, NULL, gpte_to_gfn(gpte));
}

/*
@@ -399,9 +316,9 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
*shadow_ent = shadow_pte;
}

- FNAME(set_pte)(vcpu, shadow_ent, access, walker->pte_access & access,
- user_fault, write_fault, walker->pte & PT_DIRTY_MASK,
- ptwrite, walker->gfn);
+ mmu_set_spte(vcpu, shadow_ent, access, walker->pte_access & access,
+ user_fault, write_fault, walker->pte & PT_DIRTY_MASK,
+ ptwrite, walker->gfn);

return shadow_ent;
}
--
1.5.3.7


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