From 85fd514e24238a633c971332aa96a2e5c4ddd502 Mon Sep 17 00:00:00 2001 From: Jim Mattson Date: Fri, 7 Jul 2017 12:51:41 -0700 Subject: [PATCH] kvm: nVMX: Shadow "high" parts of shadowed 64-bit VMCS fields 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 Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx.c | 60 ++++++++++++++++++++++++++-------------------- 1 file changed, 34 insertions(+), 26 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index e02c7004b64b..32db3f5dce7f 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -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 -- 2.20.1