On Thu, 2018-01-04 at 00:15 +0000, Andrew Cooper wrote: > > --- a/xen/include/asm-x86/asm_defns.h > +++ b/xen/include/asm-x86/asm_defns.h > @@ -217,22 +217,34 @@ static always_inline void stac(void) > addq $-(UREGS_error_code-UREGS_r15), %rsp > cld > movq %rdi,UREGS_rdi(%rsp) > + xor %edi, %edi > movq %rsi,UREGS_rsi(%rsp) > + xor %esi, %esi > movq %rdx,UREGS_rdx(%rsp) > + xor %edx, %edx > movq %rcx,UREGS_rcx(%rsp) > + xor %ecx, %ecx > movq %rax,UREGS_rax(%rsp) > + xor %eax, %eax
You didn't want to erase all 64 bits?
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