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KVM: nVMX: do not pin the VMCS12

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Since the current implementation of VMCS12 does a memcpy in and out
of guest memory, we do not need current_vmcs12 and current_vmcs12_page
anymore.  current_vmptr is enough to read and write the VMCS12.

And David Matlack noted:

  This patch also fixes dirty tracking (memslot->dirty_bitmap) of the
  VMCS12 page by using kvm_write_guest. nested_release_page() only marks
  the struct page dirty.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
[Added David Matlack's note and nested_release_page_clean() fix.]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-07-27 15:54:46 +02:00 committed by Radim Krčmář
parent 3898da947b
commit 9f744c5974
1 changed files with 7 additions and 17 deletions
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24
arch/x86/kvm/vmx.c
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@ -416,9 +416,6 @@ struct nested_vmx {
/* The guest-physical address of the current VMCS L1 keeps for L2 */
gpa_t current_vmptr;
/* The host-usable pointer to the above */
struct page *current_vmcs12_page;
struct vmcs12 *current_vmcs12;
/*
* Cache of the guest's VMCS, existing outside of guest memory.
* Loaded from guest memory during VMPTRLD. Flushed to guest
@ -7182,10 +7179,6 @@ static inline void nested_release_vmcs12(struct vcpu_vmx *vmx)
if (vmx->nested.current_vmptr == -1ull)
return;
/* current_vmptr and current_vmcs12 are always set/reset together */
if (WARN_ON(vmx->nested.current_vmcs12 == NULL))
return;
if (enable_shadow_vmcs) {
/* copy to memory all shadowed fields in case
they were modified */
@ -7198,13 +7191,11 @@ static inline void nested_release_vmcs12(struct vcpu_vmx *vmx)
vmx->nested.posted_intr_nv = -1;
/* Flush VMCS12 to guest memory */
memcpy(vmx->nested.current_vmcs12, vmx->nested.cached_vmcs12,
VMCS12_SIZE);
kvm_vcpu_write_guest_page(&vmx->vcpu,
vmx->nested.current_vmptr >> PAGE_SHIFT,
vmx->nested.cached_vmcs12, 0, VMCS12_SIZE);
kunmap(vmx->nested.current_vmcs12_page);
nested_release_page(vmx->nested.current_vmcs12_page);
vmx->nested.current_vmptr = -1ull;
vmx->nested.current_vmcs12 = NULL;
}
/*
@ -7622,14 +7613,14 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
}
nested_release_vmcs12(vmx);
vmx->nested.current_vmcs12 = new_vmcs12;
vmx->nested.current_vmcs12_page = page;
/*
* Load VMCS12 from guest memory since it is not already
* cached.
*/
memcpy(vmx->nested.cached_vmcs12,
vmx->nested.current_vmcs12, VMCS12_SIZE);
memcpy(vmx->nested.cached_vmcs12, new_vmcs12, VMCS12_SIZE);
kunmap(page);
nested_release_page_clean(page);
set_current_vmptr(vmx, vmptr);
}
@ -9284,7 +9275,6 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
vmx->nested.posted_intr_nv = -1;
vmx->nested.current_vmptr = -1ull;
vmx->nested.current_vmcs12 = NULL;
vmx->msr_ia32_feature_control_valid_bits = FEATURE_CONTROL_LOCKED;