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KVM: nSVM: remove trailing padding for struct vmcb_control_area

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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>
This commit is contained in:
Paolo Bonzini 2020-05-18 15:24:46 -04:00
parent 2f675917ef
commit 7923ef4f6e
1 changed files with 8 additions and 1 deletions
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9
arch/x86/include/asm/svm.h
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@ -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;
};