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Subject[PATCH 10/29] KVM: MMU: Introduce generic walk_addr function
Date
This is the first patch in the series towards a generic
walk_addr implementation which could walk two-dimensional
page tables in the end. In this first step the walk_addr
function is renamed into walk_addr_generic which takes a
mmu context as an additional parameter.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kvm/paging_tmpl.h | 26 ++++++++++++++++++--------
1 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index d07f48a..a704a81 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -114,9 +114,10 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
/*
* Fetch a guest pte for a guest virtual address
*/
-static int FNAME(walk_addr)(struct guest_walker *walker,
- struct kvm_vcpu *vcpu, gva_t addr,
- int write_fault, int user_fault, int fetch_fault)
+static int FNAME(walk_addr_generic)(struct guest_walker *walker,
+ struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+ gva_t addr, int write_fault,
+ int user_fault, int fetch_fault)
{
pt_element_t pte;
gfn_t table_gfn;
@@ -129,10 +130,11 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
walk:
present = true;
eperm = rsvd_fault = false;
- walker->level = vcpu->arch.mmu.root_level;
- pte = vcpu->arch.mmu.get_cr3(vcpu);
+ walker->level = mmu->root_level;
+ pte = mmu->get_cr3(vcpu);
+
#if PTTYPE == 64
- if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
+ if (walker->level == PT32E_ROOT_LEVEL) {
pte = kvm_pdptr_read(vcpu, (addr >> 30) & 3);
trace_kvm_mmu_paging_element(pte, walker->level);
if (!is_present_gpte(pte)) {
@@ -143,7 +145,7 @@ walk:
}
#endif
ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) ||
- (vcpu->arch.mmu.get_cr3(vcpu) & CR3_NONPAE_RESERVED_BITS) == 0);
+ (mmu->get_cr3(vcpu) & CR3_NONPAE_RESERVED_BITS) == 0);

pt_access = ACC_ALL;

@@ -205,7 +207,7 @@ walk:
(PTTYPE == 64 || is_pse(vcpu))) ||
((walker->level == PT_PDPE_LEVEL) &&
is_large_pte(pte) &&
- vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL)) {
+ mmu->root_level == PT64_ROOT_LEVEL)) {
int lvl = walker->level;

walker->gfn = gpte_to_gfn_lvl(pte, lvl);
@@ -266,6 +268,14 @@ error:
return 0;
}

+static int FNAME(walk_addr)(struct guest_walker *walker,
+ struct kvm_vcpu *vcpu, gva_t addr,
+ int write_fault, int user_fault, int fetch_fault)
+{
+ return FNAME(walk_addr_generic)(walker, vcpu, &vcpu->arch.mmu, addr,
+ write_fault, user_fault, fetch_fault);
+}
+
static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
u64 *spte, const void *pte)
{
--
1.7.0.4



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