On Fri, May 15, 2009 at 10:22:19AM +0200, Alexander Graf wrote:
> SVM adds another way to do INVLPG by ASID which Hyper-V makes use of,
> so let's implement it!
>
> For now we just do the same thing invlpg does, as asid switching
> means we flush the mmu anyways. That might change one day though.
>
> Signed-off-by: Alexander Graf <ag...@suse.de>
> ---
> arch/x86/kvm/svm.c | 14 +++++++++++++-
> 1 files changed, 13 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index 30e6b43..b2c6cf3 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -1785,6 +1785,18 @@ static int clgi_interception(struct vcpu_svm *svm,
> struct kvm_run *kvm_run)
> return 1;
> }
>
> +static int invlpga_interception(struct vcpu_svm *svm, struct kvm_run
> *kvm_run)
> +{
> + struct kvm_vcpu *vcpu = &svm->vcpu;
> + nsvm_printk("INVLPGA\n");
> + svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
> + skip_emulated_instruction(&svm->vcpu);
> +
> + kvm_mmu_reset_context(vcpu);
> + kvm_mmu_load(vcpu);
> + return 1;
> +}
> +
Hmm, since we flush the TLB on every nested-guest entry I think we can
make this function a nop.
> static int invalid_op_interception(struct vcpu_svm *svm,
> struct kvm_run *kvm_run)
> {
> @@ -2130,7 +2142,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
> [SVM_EXIT_INVD] = emulate_on_interception,
> [SVM_EXIT_HLT] = halt_interception,
> [SVM_EXIT_INVLPG] = invlpg_interception,
> - [SVM_EXIT_INVLPGA] = invalid_op_interception,
> + [SVM_EXIT_INVLPGA] = invlpga_interception,
> [SVM_EXIT_IOIO] = io_interception,
> [SVM_EXIT_MSR] = msr_interception,
> [SVM_EXIT_TASK_SWITCH] = task_switch_interception,
> --
> 1.6.0.2
>
>
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