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KVM: SVM: get rid of nested_svm_vmexit_real

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This patch is the starting point of removing nested_svm_do from the
nested svm code. The nested_svm_do function basically maps two guest
physical pages to host virtual addresses and calls a passed function
on it. This function pointer code flow is hard to read and not the
best technical solution here.
As a side effect this patch indroduces the nested_svm_[un]map helper
functions.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2009-08-07 11:49:38 +02:00 committed by Avi Kivity
parent 0295ad7de8
commit 34f80cfad5
1 changed files with 40 additions and 12 deletions
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52
arch/x86/kvm/svm.c
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@ -1390,6 +1390,39 @@ static inline int nested_svm_intr(struct vcpu_svm *svm)
return 0;
}
static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, enum km_type idx)
{
struct page *page;
down_read(&current->mm->mmap_sem);
page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT);
up_read(&current->mm->mmap_sem);
if (is_error_page(page))
goto error;
return kmap_atomic(page, idx);
error:
kvm_release_page_clean(page);
kvm_inject_gp(&svm->vcpu, 0);
return NULL;
}
static void nested_svm_unmap(void *addr, enum km_type idx)
{
struct page *page;
if (!addr)
return;
page = kmap_atomic_to_page(addr);
kunmap_atomic(addr, idx);
kvm_release_page_dirty(page);
}
static struct page *nested_svm_get_page(struct vcpu_svm *svm, u64 gpa)
{
struct page *page;
@ -1597,13 +1630,16 @@ static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *fr
dst->lbr_ctl = from->lbr_ctl;
}
static int nested_svm_vmexit_real(struct vcpu_svm *svm, void *arg1,
void *arg2, void *opaque)
static int nested_svm_vmexit(struct vcpu_svm *svm)
{
struct vmcb *nested_vmcb = (struct vmcb *)arg1;
struct vmcb *nested_vmcb;
struct vmcb *hsave = svm->nested.hsave;
struct vmcb *vmcb = svm->vmcb;
nested_vmcb = nested_svm_map(svm, svm->nested.vmcb, KM_USER0);
if (!nested_vmcb)
return 1;
/* Give the current vmcb to the guest */
disable_gif(svm);
@ -1678,15 +1714,7 @@ static int nested_svm_vmexit_real(struct vcpu_svm *svm, void *arg1,
/* Exit nested SVM mode */
svm->nested.vmcb = 0;
return 0;
}
static int nested_svm_vmexit(struct vcpu_svm *svm)
{
nsvm_printk("VMexit\n");
if (nested_svm_do(svm, svm->nested.vmcb, 0,
NULL, nested_svm_vmexit_real))
return 1;
nested_svm_unmap(nested_vmcb, KM_USER0);
kvm_mmu_reset_context(&svm->vcpu);
kvm_mmu_load(&svm->vcpu);