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openSUSE:Leap:15.0:Rings:1-MinimalX
xen
5a4fd894-1-x86-rearrange-RESTORE_ALL-to-restore...
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File 5a4fd894-1-x86-rearrange-RESTORE_ALL-to-restore-in-stack-order.patch of Package xen
# Commit f85d105e27735f0e20aa30d77f03774f3ed55ae5 # Date 2018-01-05 19:57:08 +0000 # Author Andrew Cooper <andrew.cooper3@citrix.com> # Committer Andrew Cooper <andrew.cooper3@citrix.com> x86/entry: Rearrange RESTORE_ALL to restore register in stack order Results in a more predictable (i.e. linear) memory access pattern. No functional change. This is part of XSA-254. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com> --- a/xen/include/asm-x86/asm_defns.h +++ b/xen/include/asm-x86/asm_defns.h @@ -259,6 +259,19 @@ static always_inline void stac(void) */ .macro RESTORE_ALL adj=0 compat=0 .if !\compat + movq UREGS_r15(%rsp), %r15 + movq UREGS_r14(%rsp), %r14 + movq UREGS_r13(%rsp), %r13 + movq UREGS_r12(%rsp), %r12 +.else + xor %r15, %r15 + xor %r14, %r14 + xor %r13, %r13 + xor %r12, %r12 +.endif + LOAD_ONE_REG(bp, \compat) + LOAD_ONE_REG(bx, \compat) +.if !\compat movq UREGS_r11(%rsp),%r11 movq UREGS_r10(%rsp),%r10 movq UREGS_r9(%rsp),%r9 @@ -274,19 +287,6 @@ static always_inline void stac(void) LOAD_ONE_REG(dx, \compat) LOAD_ONE_REG(si, \compat) LOAD_ONE_REG(di, \compat) -.if !\compat - movq UREGS_r15(%rsp),%r15 - movq UREGS_r14(%rsp),%r14 - movq UREGS_r13(%rsp),%r13 - movq UREGS_r12(%rsp),%r12 -.else - xor %r15, %r15 - xor %r14, %r14 - xor %r13, %r13 - xor %r12, %r12 -.endif - LOAD_ONE_REG(bp, \compat) - LOAD_ONE_REG(bx, \compat) subq $-(UREGS_error_code-UREGS_r15+\adj), %rsp .endm
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