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MIPS: KVM: Add CP0_Count/Compare KVM register access

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Implement KVM_{GET,SET}_ONE_REG ioctl based access to the guest CP0
Count and Compare registers. These registers are special in that writing
to them has side effects (adjusting the time until the next timer
interrupt) and reading of Count depends on the time. Therefore add a
couple of callbacks so that different implementations (trap & emulate or
VZ) can implement them differently depending on what the hardware
provides.

The trap & emulate versions mostly duplicate what happens when a T&E
guest reads or writes these registers, so it inherits the same
limitations which can be fixed in later patches.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: kvm@vger.kernel.org
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: David Daney <david.daney@cavium.com>
Cc: Sanjay Lal <sanjayl@kymasys.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
James Hogan
2014-05-29 10:16:29 +01:00
committed by Paolo Bonzini
parent 48a3c4e4cd
commit f8be02daca
3 changed files with 56 additions and 0 deletions
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4
arch/mips/include/asm/kvm_host.h
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@@ -523,6 +523,10 @@ struct kvm_mips_callbacks {
uint32_t cause);
int (*irq_clear) (struct kvm_vcpu *vcpu, unsigned int priority,
uint32_t cause);
int (*get_one_reg)(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg, s64 *v);
int (*set_one_reg)(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg, s64 v);
};
extern struct kvm_mips_callbacks *kvm_mips_callbacks;
int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks);