KVM: fix poison overwritten caused by using wrong xstate size

fpu.state is allocated from task_xstate_cachep, the size of task_xstate_cachep
is xstate_size. xstate_size is set from cpuid instruction, which is often
smaller than sizeof(struct xsave_struct). kvm is using sizeof(struct xsave_struct)
to fill in/out fpu.state.xsave, as what we allocated for fpu.state is
xstate_size, kernel will write out of memory and caused poison/redzone/padding
overwritten warnings.

Signed-off-by: Xiaotian Feng <[email protected]>
Reviewed-by: Sheng Yang <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Suresh Siddha <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Avi Kivity <[email protected]>
Cc: Robert Richter <[email protected]>
Cc: Sheng Yang <[email protected]>
Cc: Marcelo Tosatti <[email protected]>
Cc: Gleb Natapov <[email protected]>
Cc: Jan Kiszka <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>

0 files changed, 0 insertions, 0 deletions