Commit d5e52813 authored by Alexander Graf's avatar Alexander Graf Committed by Marcelo Tosatti
Browse files

KVM: PPC: Add helper functions to call real mode loaders 



Linux contains quite some bits of code to load FPU, Altivec and VSX lazily for
a task. It calls those bits in real mode, coming from an interrupt handler.

For KVM we better reuse those, so let's wrap a bit of trampoline magic around
them and then we can call them from normal module code.

Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent fbad5f1d

arch/powerpc/include/asm/kvm_book3s.h

+3 −0
Original line number Diff line number Diff line
@@ -124,6 +124,9 @@ extern void kvmppc_set_bat(struct kvm_vcpu *vcpu, struct kvmppc_bat *bat, 
extern u32 kvmppc_trampoline_lowmem;

extern u32 kvmppc_trampoline_enter;

extern void kvmppc_rmcall(ulong srr0, ulong srr1);

extern void kvmppc_load_up_fpu(void);

extern void kvmppc_load_up_altivec(void);

extern void kvmppc_load_up_vsx(void);



static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)

{

arch/powerpc/kvm/book3s_64_exports.c

+7 −0
Original line number Diff line number Diff line
@@ -23,3 +23,10 @@ 
EXPORT_SYMBOL_GPL(kvmppc_trampoline_enter);

EXPORT_SYMBOL_GPL(kvmppc_trampoline_lowmem);

EXPORT_SYMBOL_GPL(kvmppc_rmcall);

EXPORT_SYMBOL_GPL(kvmppc_load_up_fpu);

#ifdef CONFIG_ALTIVEC

EXPORT_SYMBOL_GPL(kvmppc_load_up_altivec);

#endif

#ifdef CONFIG_VSX

EXPORT_SYMBOL_GPL(kvmppc_load_up_vsx);

#endif

arch/powerpc/kvm/book3s_64_rmhandlers.S

+34 −0
Original line number Diff line number Diff line
@@ -158,6 +158,40 @@ _GLOBAL(kvmppc_rmcall) 
	mtsrr1	r4

	RFI



/*

 * Activate current's external feature (FPU/Altivec/VSX)

 */

#define define_load_up(what) 				\

							\

_GLOBAL(kvmppc_load_up_ ## what);			\

	subi	r1, r1, INT_FRAME_SIZE;			\

	mflr	r3;					\

	std	r3, _LINK(r1);				\

	mfmsr	r4;					\

	std	r31, GPR3(r1);				\

	mr	r31, r4;				\

	li	r5, MSR_DR;				\

	oris	r5, r5, MSR_EE@h;			\

	andc	r4, r4, r5;				\

	mtmsr	r4;					\

							\

	bl	.load_up_ ## what;			\

							\

	mtmsr	r31;					\

	ld	r3, _LINK(r1);				\

	ld	r31, GPR3(r1);				\

	addi	r1, r1, INT_FRAME_SIZE;			\

	mtlr	r3;					\

	blr



define_load_up(fpu)

#ifdef CONFIG_ALTIVEC

define_load_up(altivec)

#endif

#ifdef CONFIG_VSX

define_load_up(vsx)

#endif



.global kvmppc_trampoline_lowmem

kvmppc_trampoline_lowmem:

	.long kvmppc_handler_lowmem_trampoline - _stext

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