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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: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2010-01-15 14:49:10 +01:00 committed by Marcelo Tosatti
parent fbad5f1dfd
commit d5e528136c
3 changed files with 44 additions and 0 deletions
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3
arch/powerpc/include/asm/kvm_book3s.h
View File

@ -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)
{

7
arch/powerpc/kvm/book3s_64_exports.c
View File

@ -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

34
arch/powerpc/kvm/book3s_64_rmhandlers.S
View File

@ -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