From: Alexander Graf <ag...@suse.de> 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 <ag...@suse.de> Signed-off-by: Avi Kivity <a...@redhat.com> --- arch/powerpc/include/asm/kvm_book3s.h | 3 ++ arch/powerpc/kvm/book3s_64_exports.c | 7 ++++++ arch/powerpc/kvm/book3s_64_rmhandlers.S | 34 +++++++++++++++++++++++++++++++ 3 files changed, 44 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index c7db69f..e1b441c 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -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) { diff --git a/arch/powerpc/kvm/book3s_64_exports.c b/arch/powerpc/kvm/book3s_64_exports.c index 99b0712..1dd5a1d 100644 --- a/arch/powerpc/kvm/book3s_64_exports.c +++ b/arch/powerpc/kvm/book3s_64_exports.c @@ -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 diff --git a/arch/powerpc/kvm/book3s_64_rmhandlers.S b/arch/powerpc/kvm/book3s_64_rmhandlers.S index e7091c9..c83c60a 100644 --- a/arch/powerpc/kvm/book3s_64_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_64_rmhandlers.S @@ -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...@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 -- 1.6.5.3 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html