forked from luck/tmp_suning_uos_patched
x86/paravirt/xen: Remove xen_patch()
Xen's paravirt patch function xen_patch() does some special casing for irq_ops functions to apply relocations when those functions can be patched inline instead of calls. Unfortunately none of the special case function replacements is small enough to be patched inline, so the special case never applies. As xen_patch() will call paravirt_patch_default() in all cases it can be just dropped. xen-asm.h doesn't seem necessary without xen_patch() as the only thing left in it would be the definition of XEN_EFLAGS_NMI used only once. So move that definition and remove xen-asm.h. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boris.ostrovsky@oracle.com Cc: lguest@lists.ozlabs.org Cc: rusty@rustcorp.com.au Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/20170816173157.8633-2-jgross@suse.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Juergen Gross
Ingo Molnar
parent
ee97638b57
commit
edcb5cf84f
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@ -981,59 +981,6 @@ void __ref xen_setup_vcpu_info_placement(void)
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}
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}
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static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
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unsigned long addr, unsigned len)
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{
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char *start, *end, *reloc;
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unsigned ret;
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start = end = reloc = NULL;
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#define SITE(op, x) \
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case PARAVIRT_PATCH(op.x): \
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if (xen_have_vcpu_info_placement) { \
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start = (char *)xen_##x##_direct; \
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end = xen_##x##_direct_end; \
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reloc = xen_##x##_direct_reloc; \
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} \
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goto patch_site
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switch (type) {
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SITE(pv_irq_ops, irq_enable);
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SITE(pv_irq_ops, irq_disable);
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SITE(pv_irq_ops, save_fl);
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SITE(pv_irq_ops, restore_fl);
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#undef SITE
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patch_site:
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if (start == NULL || (end-start) > len)
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goto default_patch;
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ret = paravirt_patch_insns(insnbuf, len, start, end);
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/* Note: because reloc is assigned from something that
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appears to be an array, gcc assumes it's non-null,
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but doesn't know its relationship with start and
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end. */
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if (reloc > start && reloc < end) {
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int reloc_off = reloc - start;
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long *relocp = (long *)(insnbuf + reloc_off);
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long delta = start - (char *)addr;
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*relocp += delta;
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}
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break;
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default_patch:
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default:
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ret = paravirt_patch_default(type, clobbers, insnbuf,
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addr, len);
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break;
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}
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return ret;
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}
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static const struct pv_info xen_info __initconst = {
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.shared_kernel_pmd = 0,
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@ -1043,10 +990,6 @@ static const struct pv_info xen_info __initconst = {
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.name = "Xen",
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};
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static const struct pv_init_ops xen_init_ops __initconst = {
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.patch = xen_patch,
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};
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static const struct pv_cpu_ops xen_cpu_ops __initconst = {
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.cpuid = xen_cpuid,
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@ -1244,7 +1187,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
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/* Install Xen paravirt ops */
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pv_info = xen_info;
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pv_init_ops = xen_init_ops;
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pv_init_ops.patch = paravirt_patch_default;
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pv_cpu_ops = xen_cpu_ops;
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x86_platform.get_nmi_reason = xen_get_nmi_reason;
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@ -1,14 +1,8 @@
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/*
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* Asm versions of Xen pv-ops, suitable for either direct use or
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* inlining. The inline versions are the same as the direct-use
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* versions, with the pre- and post-amble chopped off.
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*
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* This code is encoded for size rather than absolute efficiency, with
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* a view to being able to inline as much as possible.
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* Asm versions of Xen pv-ops, suitable for direct use.
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*
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* We only bother with direct forms (ie, vcpu in percpu data) of the
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* operations here; the indirect forms are better handled in C, since
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* they're generally too large to inline anyway.
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* operations here; the indirect forms are better handled in C.
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*/
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#include <asm/asm-offsets.h>
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@ -16,7 +10,7 @@
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#include <asm/processor-flags.h>
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#include <asm/frame.h>
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#include "xen-asm.h"
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#include <linux/linkage.h>
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/*
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* Enable events. This clears the event mask and tests the pending
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@ -38,13 +32,11 @@ ENTRY(xen_irq_enable_direct)
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testb $0xff, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_pending
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jz 1f
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2: call check_events
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call check_events
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1:
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ENDPATCH(xen_irq_enable_direct)
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FRAME_END
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ret
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ENDPROC(xen_irq_enable_direct)
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RELOC(xen_irq_enable_direct, 2b+1)
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/*
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@ -53,10 +45,8 @@ ENDPATCH(xen_irq_enable_direct)
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*/
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ENTRY(xen_irq_disable_direct)
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movb $1, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask
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ENDPATCH(xen_irq_disable_direct)
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ret
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ENDPROC(xen_irq_disable_direct)
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RELOC(xen_irq_disable_direct, 0)
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ENDPROC(xen_irq_disable_direct)
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/*
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* (xen_)save_fl is used to get the current interrupt enable status.
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@ -71,10 +61,8 @@ ENTRY(xen_save_fl_direct)
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testb $0xff, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask
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setz %ah
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addb %ah, %ah
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ENDPATCH(xen_save_fl_direct)
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ret
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ENDPROC(xen_save_fl_direct)
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RELOC(xen_save_fl_direct, 0)
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/*
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@ -101,13 +89,11 @@ ENTRY(xen_restore_fl_direct)
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/* check for unmasked and pending */
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cmpw $0x0001, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_pending
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jnz 1f
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2: call check_events
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call check_events
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1:
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ENDPATCH(xen_restore_fl_direct)
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FRAME_END
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ret
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ENDPROC(xen_restore_fl_direct)
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RELOC(xen_restore_fl_direct, 2b+1)
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/*
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@ -1,12 +0,0 @@
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#ifndef _XEN_XEN_ASM_H
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#define _XEN_XEN_ASM_H
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#include <linux/linkage.h>
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#define RELOC(x, v) .globl x##_reloc; x##_reloc=v
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#define ENDPATCH(x) .globl x##_end; x##_end=.
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/* Pseudo-flag used for virtual NMI, which we don't implement yet */
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#define XEN_EFLAGS_NMI 0x80000000
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#endif
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@ -1,14 +1,8 @@
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/*
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* Asm versions of Xen pv-ops, suitable for either direct use or
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* inlining. The inline versions are the same as the direct-use
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* versions, with the pre- and post-amble chopped off.
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*
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* This code is encoded for size rather than absolute efficiency, with
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* a view to being able to inline as much as possible.
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* Asm versions of Xen pv-ops, suitable for direct use.
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*
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* We only bother with direct forms (ie, vcpu in pda) of the
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* operations here; the indirect forms are better handled in C, since
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* they're generally too large to inline anyway.
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* operations here; the indirect forms are better handled in C.
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*/
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#include <asm/thread_info.h>
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@ -18,21 +12,10 @@
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#include <xen/interface/xen.h>
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#include "xen-asm.h"
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#include <linux/linkage.h>
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/*
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* Force an event check by making a hypercall, but preserve regs
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* before making the call.
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*/
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check_events:
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push %eax
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push %ecx
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push %edx
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call xen_force_evtchn_callback
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pop %edx
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pop %ecx
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pop %eax
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ret
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/* Pseudo-flag used for virtual NMI, which we don't implement yet */
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#define XEN_EFLAGS_NMI 0x80000000
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/*
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* This is run where a normal iret would be run, with the same stack setup:
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@ -1,14 +1,8 @@
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/*
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* Asm versions of Xen pv-ops, suitable for either direct use or
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* inlining. The inline versions are the same as the direct-use
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* versions, with the pre- and post-amble chopped off.
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*
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* This code is encoded for size rather than absolute efficiency, with
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* a view to being able to inline as much as possible.
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* Asm versions of Xen pv-ops, suitable for direct use.
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*
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* We only bother with direct forms (ie, vcpu in pda) of the
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* operations here; the indirect forms are better handled in C, since
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* they're generally too large to inline anyway.
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* operations here; the indirect forms are better handled in C.
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*/
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#include <asm/errno.h>
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@ -20,7 +14,7 @@
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#include <xen/interface/xen.h>
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#include "xen-asm.h"
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#include <linux/linkage.h>
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ENTRY(xen_adjust_exception_frame)
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mov 8+0(%rsp), %rcx
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@ -46,9 +40,7 @@ hypercall_iret = hypercall_page + __HYPERVISOR_iret * 32
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*/
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ENTRY(xen_iret)
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pushq $0
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1: jmp hypercall_iret
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ENDPATCH(xen_iret)
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RELOC(xen_iret, 1b+1)
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jmp hypercall_iret
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ENTRY(xen_sysret64)
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/*
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@ -65,9 +57,7 @@ ENTRY(xen_sysret64)
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pushq %rcx
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pushq $VGCF_in_syscall
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1: jmp hypercall_iret
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ENDPATCH(xen_sysret64)
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RELOC(xen_sysret64, 1b+1)
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jmp hypercall_iret
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/*
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* Xen handles syscall callbacks much like ordinary exceptions, which
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@ -129,17 +129,10 @@ static inline void __init xen_efi_init(void)
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}
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#endif
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/* Declare an asm function, along with symbols needed to make it
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inlineable */
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#define DECL_ASM(ret, name, ...) \
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__visible ret name(__VA_ARGS__); \
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extern char name##_end[] __visible; \
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extern char name##_reloc[] __visible
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DECL_ASM(void, xen_irq_enable_direct, void);
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DECL_ASM(void, xen_irq_disable_direct, void);
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DECL_ASM(unsigned long, xen_save_fl_direct, void);
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DECL_ASM(void, xen_restore_fl_direct, unsigned long);
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__visible void xen_irq_enable_direct(void);
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__visible void xen_irq_disable_direct(void);
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__visible unsigned long xen_save_fl_direct(void);
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__visible void xen_restore_fl_direct(unsigned long);
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/* These are not functions, and cannot be called normally */
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__visible void xen_iret(void);
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