The first patch fixes Xen PV regression introduced by 32-bit rewrite. Unlike the
earlier version it uses ALTERNATIVE instruction and avoids using xen_sysexit
(and sysret32 in compat mode) pv ops, as suggested by Andy.
As result of this patch irq_enable_sysexit and usergs_sysret32 pv ops are not
used anymore by anyone and so can be removed.
v2:
* patch both TEST and JZ intructions with a single JMP
* Add magic prefix to X86_FEATURE_XENPV comment to avoid having it printed in
/proc/cpuinfo
* Clarify in commit messages why irq_enable_sysexit and usergs_sysret32 are
removed
Boris Ostrovsky (3):
x86/xen: Avoid fast syscall path for Xen PV guests
x86: irq_enable_sysexit pv op is no longer needed
x86: usergs_sysret32 pv op is no longer needed
arch/x86/entry/entry_32.S | 13 +++++--------
arch/x86/entry/entry_64_compat.S | 20 ++++++++------------
arch/x86/include/asm/cpufeature.h | 1 +
arch/x86/include/asm/paravirt.h | 12 ------------
arch/x86/include/asm/paravirt_types.h | 17 -----------------
arch/x86/kernel/asm-offsets.c | 3 ---
arch/x86/kernel/asm-offsets_64.c | 1 -
arch/x86/kernel/paravirt.c | 12 ------------
arch/x86/kernel/paravirt_patch_32.c | 2 --
arch/x86/kernel/paravirt_patch_64.c | 3 ---
arch/x86/xen/enlighten.c | 7 +++----
arch/x86/xen/xen-asm_32.S | 14 --------------
arch/x86/xen/xen-asm_64.S | 19 -------------------
arch/x86/xen/xen-ops.h | 3 ---
14 files changed, 17 insertions(+), 110 deletions(-)
--
1.8.1.4
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