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kvm: nVMX: Shadow "high" parts of shadowed 64-bit VMCS fields

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Inconsistencies result from shadowing only accesses to the full
64-bits of a 64-bit VMCS field, but not shadowing accesses to the high
32-bits of the field. The "high" part of a 64-bit field should be
shadowed whenever the full 64-bit field is shadowed.

Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jim Mattson 2017-07-07 12:51:41 -07:00 committed by Radim Krčmář
parent 5fa99cbe7b
commit 85fd514e24
1 changed files with 34 additions and 26 deletions
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60
arch/x86/kvm/vmx.c
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@ -3764,6 +3764,25 @@ static void free_kvm_area(void)
}
}
enum vmcs_field_type {
VMCS_FIELD_TYPE_U16 = 0,
VMCS_FIELD_TYPE_U64 = 1,
VMCS_FIELD_TYPE_U32 = 2,
VMCS_FIELD_TYPE_NATURAL_WIDTH = 3
};
static inline int vmcs_field_type(unsigned long field)
{
if (0x1 & field) /* the *_HIGH fields are all 32 bit */
return VMCS_FIELD_TYPE_U32;
return (field >> 13) & 0x3 ;
}
static inline int vmcs_field_readonly(unsigned long field)
{
return (((field >> 10) & 0x3) == 1);
}
static void init_vmcs_shadow_fields(void)
{
int i, j;
@ -3789,14 +3808,22 @@ static void init_vmcs_shadow_fields(void)
/* shadowed fields guest access without vmexit */
for (i = 0; i < max_shadow_read_write_fields; i++) {
clear_bit(shadow_read_write_fields[i],
vmx_vmwrite_bitmap);
clear_bit(shadow_read_write_fields[i],
vmx_vmread_bitmap);
unsigned long field = shadow_read_write_fields[i];
clear_bit(field, vmx_vmwrite_bitmap);
clear_bit(field, vmx_vmread_bitmap);
if (vmcs_field_type(field) == VMCS_FIELD_TYPE_U64) {
clear_bit(field + 1, vmx_vmwrite_bitmap);
clear_bit(field + 1, vmx_vmread_bitmap);
}
}
for (i = 0; i < max_shadow_read_only_fields; i++) {
unsigned long field = shadow_read_only_fields[i];
clear_bit(field, vmx_vmread_bitmap);
if (vmcs_field_type(field) == VMCS_FIELD_TYPE_U64)
clear_bit(field + 1, vmx_vmread_bitmap);
}
for (i = 0; i < max_shadow_read_only_fields; i++)
clear_bit(shadow_read_only_fields[i],
vmx_vmread_bitmap);
}
static __init int alloc_kvm_area(void)
@ -7219,25 +7246,6 @@ static int handle_vmresume(struct kvm_vcpu *vcpu)
return nested_vmx_run(vcpu, false);
}
enum vmcs_field_type {
VMCS_FIELD_TYPE_U16 = 0,
VMCS_FIELD_TYPE_U64 = 1,
VMCS_FIELD_TYPE_U32 = 2,
VMCS_FIELD_TYPE_NATURAL_WIDTH = 3
};
static inline int vmcs_field_type(unsigned long field)
{
if (0x1 & field) /* the *_HIGH fields are all 32 bit */
return VMCS_FIELD_TYPE_U32;
return (field >> 13) & 0x3 ;
}
static inline int vmcs_field_readonly(unsigned long field)
{
return (((field >> 10) & 0x3) == 1);
}
/*
* Read a vmcs12 field. Since these can have varying lengths and we return
* one type, we chose the biggest type (u64) and zero-extend the return value