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KVM: nVMX: Refactor handle_vmwrite

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Refactor existent code so we re-use vmcs12_write_any to copy fields from the
shadow vmcs specified by the link pointer (used by the processor,
implementation-specific) to the VMCS12 software format used by L0 to hold
the fields in L1 memory address space.

Signed-off-by: Abel Gordon <abelg@il.ibm.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Abel Gordon 2013-04-18 14:36:25 +03:00 committed by Gleb Natapov
parent 4607c2d7a2
commit 20b97feaf6
1 changed files with 28 additions and 24 deletions
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52
arch/x86/kvm/vmx.c
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@ -5842,6 +5842,33 @@ static inline bool vmcs12_read_any(struct kvm_vcpu *vcpu,
}
}
static inline bool vmcs12_write_any(struct kvm_vcpu *vcpu,
unsigned long field, u64 field_value){
short offset = vmcs_field_to_offset(field);
char *p = ((char *) get_vmcs12(vcpu)) + offset;
if (offset < 0)
return false;
switch (vmcs_field_type(field)) {
case VMCS_FIELD_TYPE_U16:
*(u16 *)p = field_value;
return true;
case VMCS_FIELD_TYPE_U32:
*(u32 *)p = field_value;
return true;
case VMCS_FIELD_TYPE_U64:
*(u64 *)p = field_value;
return true;
case VMCS_FIELD_TYPE_NATURAL_WIDTH:
*(natural_width *)p = field_value;
return true;
default:
return false; /* can never happen. */
}
}
/*
* VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was
* used before) all generate the same failure when it is missing.
@ -5906,8 +5933,6 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
gva_t gva;
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
char *p;
short offset;
/* The value to write might be 32 or 64 bits, depending on L1's long
* mode, and eventually we need to write that into a field of several
* possible lengths. The code below first zero-extends the value to 64
@ -5944,28 +5969,7 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
return 1;
}
offset = vmcs_field_to_offset(field);
if (offset < 0) {
nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
skip_emulated_instruction(vcpu);
return 1;
}
p = ((char *) get_vmcs12(vcpu)) + offset;
switch (vmcs_field_type(field)) {
case VMCS_FIELD_TYPE_U16:
*(u16 *)p = field_value;
break;
case VMCS_FIELD_TYPE_U32:
*(u32 *)p = field_value;
break;
case VMCS_FIELD_TYPE_U64:
*(u64 *)p = field_value;
break;
case VMCS_FIELD_TYPE_NATURAL_WIDTH:
*(natural_width *)p = field_value;
break;
default:
if (!vmcs12_write_any(vcpu, field, field_value)) {
nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
skip_emulated_instruction(vcpu);
return 1;