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x86_64, xen: Simplify Xen SYSCALL handling

Andy Lutomirski lkml xen-devel 1 version New

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  1. v1 Latest2 patches 0 repliesNew

Patches in v1 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/2x86/entry/64: Rearrange SYSCALL entry points for Xen's benefitarch/x86/entry/entry_64.S arch/x86/entry/entry_64_compat.S+20 -100 replies
1/2x86/entry/64: Rearrange SYSCALL entry points for Xen's benefitarch/x86/entry/entry_64.S arch/x86/entry/entry_64_compat.S+20 -100 replies
2/2x86/xen/64: Rearrange the SYSCALL entriesarch/x86/entry/entry_64.S arch/x86/entry/entry_64_compat.S arch/x86/xen/xen-asm_64.S+12 -230 replies
2/2x86/xen/64: Rearrange the SYSCALL entriesarch/x86/entry/entry_64.S arch/x86/entry/entry_64_compat.S arch/x86/xen/xen-asm_64.S+12 -230 replies

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Cover letter [PATCH 0/2] x86_64, xen: Simplify Xen SYSCALL handling

Xen's SYSCALL hooks are overcomplicated and add unnecessary places where RSP is user controlled. Simplify it and get rid of those user RSP code paths under Xen.

Tested as an Intel KVM guest. Not tested under Xen or on AMD, both of which are important.

Andy Lutomirski (2):
x86/entry/64: Rearrange SYSCALL entry points for Xen's benefit x86/xen/64: Rearrange the SYSCALL entries

 arch/x86/entry/entry_64.S        | 29 +++++++++++++++--------------
 arch/x86/entry/entry_64_compat.S | 12 +++++++-----
 arch/x86/xen/xen-asm_64.S        | 24 ++++++++++--------------
 3 files changed, 32 insertions(+), 33 deletions(-)
Signature · 1 line
2.4.3

Read the cover letter in its thread