Anthony Liguori wrote:
> This adds a CPUID entry for the paravirtualization feature bitmap. We can do
> this unconditionally because the guest requires that both the feature CPUID
> entry and the signature CPUID entry exists to enable paravirtualization.
>
> This means that guest will never enable paravirtualization if either userspace
> or kernelspace doesn't support paravirtualization.
>
> Signed-off-by: Anthony Liguori <[EMAIL PROTECTED]>
>
> diff --git a/qemu/qemu-kvm.c b/qemu/qemu-kvm.c
> index 491c32c..1c93388 100644
> --- a/qemu/qemu-kvm.c
> +++ b/qemu/qemu-kvm.c
> @@ -1103,12 +1103,18 @@ static void do_cpuid_ent(struct kvm_cpuid_entry *e,
> uint32_t function,
> int kvm_qemu_init_env(CPUState *cenv)
> {
> struct kvm_cpuid_entry cpuid_ent[100];
> + struct kvm_cpuid_entry *pv_features;
> int cpuid_nent = 0;
> CPUState copy;
> uint32_t i, limit;
>
> copy = *cenv;
>
> + pv_features = &cpuid_ent[cpuid_nent++];
> + memset(pv_features, 0, sizeof(*pv_features));
> + pv_features->function = 0x40000003;
> + pv_features->eax = (1 << KVM_PARA_FEATURE_NOP_IO_DELAY);
> +
> copy.regs[R_EAX] = 0;
> qemu_kvm_cpuid_on_env(©);
> limit = copy.regs[R_EAX];
>
Shouldn't we query kvm here to see if the feature is needed?
I imagine I/O delay is never needed unless we passthrough a device,
which this qemu doesn't support, but it would be nice to set a good
example for the future.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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