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KVM: nVMX: clean up nested_release_vmcs12 and code around it 

Make nested_release_vmcs12 idempotent.

Tested-by: Wanpeng Li <wanpeng.li@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-07-17 11:55:46 +02:00
parent 4fa7734c62
commit 9a2a05b9ed
1 changed files with 21 additions and 21 deletions
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42
arch/x86/kvm/vmx.c
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@ -6109,20 +6109,27 @@ static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
static inline void nested_release_vmcs12(struct vcpu_vmx *vmx)
{
u32 exec_control;
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) {
if (vmx->nested.current_vmcs12 != NULL) {
/* copy to memory all shadowed fields in case
they were modified */
copy_shadow_to_vmcs12(vmx);
vmx->nested.sync_shadow_vmcs = false;
exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
vmcs_write64(VMCS_LINK_POINTER, -1ull);
}
/* copy to memory all shadowed fields in case
they were modified */
copy_shadow_to_vmcs12(vmx);
vmx->nested.sync_shadow_vmcs = false;
exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
vmcs_write64(VMCS_LINK_POINTER, -1ull);
}
kunmap(vmx->nested.current_vmcs12_page);
nested_release_page(vmx->nested.current_vmcs12_page);
vmx->nested.current_vmptr = -1ull;
vmx->nested.current_vmcs12 = NULL;
}
/*
@ -6133,12 +6140,9 @@ static void free_nested(struct vcpu_vmx *vmx)
{
if (!vmx->nested.vmxon)
return;
vmx->nested.vmxon = false;
if (vmx->nested.current_vmptr != -1ull) {
nested_release_vmcs12(vmx);
vmx->nested.current_vmptr = -1ull;
vmx->nested.current_vmcs12 = NULL;
}
nested_release_vmcs12(vmx);
if (enable_shadow_vmcs)
free_vmcs(vmx->nested.current_shadow_vmcs);
/* Unpin physical memory we referred to in current vmcs02 */
@ -6175,11 +6179,8 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
if (nested_vmx_check_vmptr(vcpu, EXIT_REASON_VMCLEAR, &vmptr))
return 1;
if (vmptr == vmx->nested.current_vmptr) {
if (vmptr == vmx->nested.current_vmptr)
nested_release_vmcs12(vmx);
vmx->nested.current_vmptr = -1ull;
vmx->nested.current_vmcs12 = NULL;
}
page = nested_get_page(vcpu, vmptr);
if (page == NULL) {
@ -6521,9 +6522,8 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
skip_emulated_instruction(vcpu);
return 1;
}
if (vmx->nested.current_vmptr != -1ull)
nested_release_vmcs12(vmx);
nested_release_vmcs12(vmx);
vmx->nested.current_vmptr = vmptr;
vmx->nested.current_vmcs12 = new_vmcs12;
vmx->nested.current_vmcs12_page = page;