diff options
author | Paolo Bonzini <pbonzini@redhat.com> | 2020-05-18 15:24:46 -0400 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-06-01 04:25:59 -0400 |
commit | 7923ef4f6ec4a25a902bd827446eac860b01fd1c (patch) | |
tree | 6f1a3f6585ffc16f238861fe2474fc9d840ec22d /arch/x86 | |
parent | 2f675917efc8a4d469f8be95e6ea55b2310bfd0d (diff) |
KVM: nSVM: remove trailing padding for struct vmcb_control_area
Allow placing the VMCB structs on the stack or in other structs without
wasting too much space. Add BUILD_BUG_ON as a quick safeguard against typos.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/include/asm/svm.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index 6ece8561ba66..8a1f5382a4ea 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -96,7 +96,6 @@ struct __attribute__ ((__packed__)) vmcb_control_area { u8 reserved_6[8]; /* Offset 0xe8 */ u64 avic_logical_id; /* Offset 0xf0 */ u64 avic_physical_id; /* Offset 0xf8 */ - u8 reserved_7[768]; }; @@ -203,8 +202,16 @@ struct __attribute__ ((__packed__)) vmcb_save_area { u64 last_excp_to; }; + +static inline void __unused_size_checks(void) +{ + BUILD_BUG_ON(sizeof(struct vmcb_save_area) != 0x298); + BUILD_BUG_ON(sizeof(struct vmcb_control_area) != 256); +} + struct __attribute__ ((__packed__)) vmcb { struct vmcb_control_area control; + u8 reserved_control[1024 - sizeof(struct vmcb_control_area)]; struct vmcb_save_area save; }; |