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| author | James Hogan <james.hogan@imgtec.com> | 2014-05-29 10:16:38 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-05-30 13:02:54 +0200 |
| commit | f74a8e224e32edccade63a23bc260b141b067b1d (patch) | |
| tree | b79412e24fa3b7a059232871982f71bd1f8d2ff3 /arch/mips/kvm/kvm_mips.c | |
| parent | f82393426afb7c82f7618b3b4e440d8dd2b40c08 (diff) | |
| download | op-kernel-dev-f74a8e224e32edccade63a23bc260b141b067b1d.zip op-kernel-dev-f74a8e224e32edccade63a23bc260b141b067b1d.tar.gz | |
MIPS: KVM: Add count frequency KVM register
Expose the KVM guest CP0_Count frequency to userland via a new
KVM_REG_MIPS_COUNT_HZ register accessible with the KVM_{GET,SET}_ONE_REG
ioctls.
When the frequency is altered the bias is adjusted such that the guest
CP0_Count doesn't jump discontinuously or lose any timer interrupts.
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>
Diffstat (limited to 'arch/mips/kvm/kvm_mips.c')
| -rw-r--r-- | arch/mips/kvm/kvm_mips.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c index a2d5d42..7ccb7a5 100644 --- a/arch/mips/kvm/kvm_mips.c +++ b/arch/mips/kvm/kvm_mips.c @@ -546,6 +546,7 @@ static u64 kvm_mips_get_one_regs[] = { KVM_REG_MIPS_COUNT_CTL, KVM_REG_MIPS_COUNT_RESUME, + KVM_REG_MIPS_COUNT_HZ, }; static int kvm_mips_get_reg(struct kvm_vcpu *vcpu, @@ -627,6 +628,7 @@ static int kvm_mips_get_reg(struct kvm_vcpu *vcpu, case KVM_REG_MIPS_CP0_COUNT: case KVM_REG_MIPS_COUNT_CTL: case KVM_REG_MIPS_COUNT_RESUME: + case KVM_REG_MIPS_COUNT_HZ: ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v); if (ret) return ret; @@ -724,6 +726,7 @@ static int kvm_mips_set_reg(struct kvm_vcpu *vcpu, case KVM_REG_MIPS_CP0_CAUSE: case KVM_REG_MIPS_COUNT_CTL: case KVM_REG_MIPS_COUNT_RESUME: + case KVM_REG_MIPS_COUNT_HZ: return kvm_mips_callbacks->set_one_reg(vcpu, reg, v); default: return -EINVAL; |
