Commit a1f4d395 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Remove memory alias support 



As advertised in feature-removal-schedule.txt.  Equivalent support is provided
by overlapping memory regions.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent fc34531d

Documentation/feature-removal-schedule.txt

+0 −11
Original line number Diff line number Diff line
@@ -538,17 +538,6 @@ Who: Jan Kiszka <jan.kiszka@web.de> 


----------------------------



What:	KVM memory aliases support

When:	July 2010

Why:	Memory aliasing support is used for speeding up guest vga access

	through the vga windows.



	Modern userspace no longer uses this feature, so it's just bitrotted

	code and can be removed with no impact.

Who:	Avi Kivity <avi@redhat.com>



----------------------------



What:	xtime, wall_to_monotonic

When:	2.6.36+

Files:	kernel/time/timekeeping.c include/linux/time.h

Documentation/kvm/api.txt

+1 −11
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@@ -226,17 +226,7 @@ Type: vm ioctl 
Parameters: struct kvm_memory_alias (in)

Returns: 0 (success), -1 (error)



struct kvm_memory_alias {

	__u32 slot;  /* this has a different namespace than memory slots */

	__u32 flags;

	__u64 guest_phys_addr;

	__u64 memory_size;

	__u64 target_phys_addr;

};



Defines a guest physical address space region as an alias to another

region.  Useful for aliased address, for example the VGA low memory

window. Should not be used with userspace memory.

This ioctl is obsolete and has been removed.



4.9 KVM_RUN

arch/ia64/kvm/kvm-ia64.c

+0 −5
Original line number Diff line number Diff line
@@ -1946,11 +1946,6 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) 
	return vcpu->arch.timer_fired;

}



gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)

{

	return gfn;

}



int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)

{

	return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE) ||

arch/powerpc/kvm/powerpc.c

+0 −5
Original line number Diff line number Diff line
@@ -36,11 +36,6 @@ 
#define CREATE_TRACE_POINTS

#include "trace.h"



gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)

{

	return gfn;

}



int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)

{

	return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);

arch/s390/kvm/kvm-s390.c

+0 −5
Original line number Diff line number Diff line
@@ -723,11 +723,6 @@ void kvm_arch_flush_shadow(struct kvm *kvm) 
{

}



gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)

{

	return gfn;

}



static int __init kvm_s390_init(void)

{

	int ret;