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KVM: VMX: Introduce KVM_SET_IDENTITY_MAP_ADDR ioctl

Sfoglia il codice sorgente 
Now KVM allow guest to modify guest's physical address of EPT's identity mapping page.

(change from v1, discard unnecessary check, change ioctl to accept parameter
address rather than value)

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Sheng Yang
2009-07-21 10:42:48 +08:00
committato da Avi Kivity
parent b792c344df
commit b927a3cec0
4 ha cambiato i file con 32 aggiunte e 5 eliminazioni
Scarica il file Patch Scarica il file Diff Expand all files Collapse all files

15
arch/x86/kvm/vmx.c
Vedi File

@@ -1719,7 +1719,7 @@ static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
eptp = construct_eptp(cr3);
vmcs_write64(EPT_POINTER, eptp);
guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
VMX_EPT_IDENTITY_PAGETABLE_ADDR;
vcpu->kvm->arch.ept_identity_map_addr;
}
vmx_flush_tlb(vcpu);
@@ -2122,7 +2122,7 @@ static int init_rmode_identity_map(struct kvm *kvm)
if (likely(kvm->arch.ept_identity_pagetable_done))
return 1;
ret = 0;
identity_map_pfn = VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT;
identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
if (r < 0)
goto out;
@@ -2191,14 +2191,15 @@ static int alloc_identity_pagetable(struct kvm *kvm)
goto out;
kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
kvm_userspace_mem.flags = 0;
kvm_userspace_mem.guest_phys_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR;
kvm_userspace_mem.guest_phys_addr =
kvm->arch.ept_identity_map_addr;
kvm_userspace_mem.memory_size = PAGE_SIZE;
r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
if (r)
goto out;
kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
out:
up_write(&kvm->slots_lock);
return r;
@@ -3814,9 +3815,13 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
if (alloc_apic_access_page(kvm) != 0)
goto free_vmcs;
if (enable_ept)
if (enable_ept) {
if (!kvm->arch.ept_identity_map_addr)
kvm->arch.ept_identity_map_addr =
VMX_EPT_IDENTITY_PAGETABLE_ADDR;
if (alloc_identity_pagetable(kvm) != 0)
goto free_vmcs;
}
return &vmx->vcpu;