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KVM: x86: add SYNC_REGS_SIZE_BYTES #define.

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Replace hardcoded padding size value for struct kvm_sync_regs
with #define SYNC_REGS_SIZE_BYTES.

Also update the value specified in api.txt from outdated hardcoded
value to SYNC_REGS_SIZE_BYTES.

Signed-off-by: Ken Hofsass <hofsass@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Ken Hofsass 2018-01-31 16:03:35 -08:00 committed by Radim Krčmář
parent faeb7833ee
commit 7b7e39522a
2 changed files with 6 additions and 2 deletions
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2
Documentation/virtual/kvm/api.txt
View File

@ -3905,7 +3905,7 @@ in userspace.
__u64 kvm_dirty_regs; __u64 kvm_dirty_regs;
union { union {
struct kvm_sync_regs regs; struct kvm_sync_regs regs;
char padding[1024]; char padding[SYNC_REGS_SIZE_BYTES];
} s; } s;
If KVM_CAP_SYNC_REGS is defined, these fields allow userspace to access If KVM_CAP_SYNC_REGS is defined, these fields allow userspace to access

6
include/uapi/linux/kvm.h
View File

@ -396,6 +396,10 @@ struct kvm_run {
char padding[256]; char padding[256];
}; };
/* 2048 is the size of the char array used to bound/pad the size
* of the union that holds sync regs.
*/
#define SYNC_REGS_SIZE_BYTES 2048
/* /*
* shared registers between kvm and userspace. * shared registers between kvm and userspace.
* kvm_valid_regs specifies the register classes set by the host * kvm_valid_regs specifies the register classes set by the host
@ -407,7 +411,7 @@ struct kvm_run {
__u64 kvm_dirty_regs; __u64 kvm_dirty_regs;
union { union {
struct kvm_sync_regs regs; struct kvm_sync_regs regs;
char padding[2048]; char padding[SYNC_REGS_SIZE_BYTES];
} s; } s;
}; };