On Mon, Sep 28, 2015 at 4:16 AM, Razvan Cojocaru <rcojoc...@bitdefender.com>
wrote:
> A previous version of this patch dealing with support for skipping
> the current instruction when a vm_event response requested it
> computed the instruction length in the hypervisor, adding non-trivial
> code dependencies. This patch allows a userspace vm_event client to
> simply request that the guest's EIP is set to an arbitary value,
> computed by the introspection application. The registers that can
> now be set are EAX-EDX, ESP, EBP, ESI, EDI, R8-R15, EFLAGS, and EIP.
> CR0, CR3 and CR4 are not set, as at the time of vm_event_resume()
> we can't call hvm_set_cr{0,3,4}() and simply setting
> v->arch.hvm_vcpu.guest_cr[{0,3,4}] is unlikely to have the desired
> effect. The rest of the vm_event registers are not set because
> they're not being filled by hvm_event_fill_regs(), but only by
> p2m_vm_event_fill_regs().
> The VCPU needs to be paused for this flag to take effect.
>
> Signed-off-by: Razvan Cojocaru <rcojoc...@bitdefender.com>
>
Acked-by: Tamas K Lengyel <ta...@tklengyel.com>
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