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KVM: MMU: Introduce generic walk_addr function

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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>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2010-09-10 17:30:47 +02:00 committed by Avi Kivity
parent 8df25a328a
commit 1e301feb07
1 changed files with 18 additions and 8 deletions
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26
arch/x86/kvm/paging_tmpl.h
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@ -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 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
}
#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 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
(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 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
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)
{