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MIPS: KVM: Make KVM_GET_REG_LIST dynamic

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Make the implementation of KVM_GET_REG_LIST more dynamic so that only
the subset of registers actually available can be exposed to user mode.
This is important for VZ where some of the guest register state may not
be possible to prevent the guest from accessing, therefore the user
process may need to be aware of the state even if it doesn't understand
what the state is for.

This also allows different MIPS KVM implementations to provide different
registers to one another, by way of new num_regs(vcpu) and
copy_reg_indices(vcpu, indices) callback functions, currently just
stubbed for trap & emulate.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
James Hogan
2016-06-15 19:29:49 +01:00
committed by Paolo Bonzini
parent cc68d22f97
commit f5c43bd421
3 changed files with 37 additions and 7 deletions
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2
arch/mips/include/asm/kvm_host.h
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@@ -560,6 +560,8 @@ struct kvm_mips_callbacks {
u32 cause);
int (*irq_clear)(struct kvm_vcpu *vcpu, unsigned int priority,
u32 cause);
unsigned long (*num_regs)(struct kvm_vcpu *vcpu);
int (*copy_reg_indices)(struct kvm_vcpu *vcpu, u64 __user *indices);
int (*get_one_reg)(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg, s64 *v);
int (*set_one_reg)(struct kvm_vcpu *vcpu,