Re: [Xen-devel] [PATCH v2 1/2] hvm/vmx: save dr7 during vmx_vmcs_save

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.02.16 at 01:22, <tlengyel@xxxxxxxxxxx> wrote:
> Sending the dr7 register during vm_events is useful for various applications,
> but the current way the register value is gathered is incorrent. In this 
> patch
> we extend vmx_vmcs_save so that we get the correct value.
> 
> Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Iirc Andrew suggested ...

> --- a/xen/arch/x86/hvm/vmx/vmx.c
> +++ b/xen/arch/x86/hvm/vmx/vmx.c
> @@ -490,6 +490,7 @@ static void vmx_vmcs_save(struct vcpu *v, struct 
> hvm_hw_cpu *c)
>      __vmread(GUEST_SYSENTER_CS, &c->sysenter_cs);
>      __vmread(GUEST_SYSENTER_ESP, &c->sysenter_esp);
>      __vmread(GUEST_SYSENTER_EIP, &c->sysenter_eip);
> +    __vmread(GUEST_DR7, &c->dr7);

... just when v == current.

Jan


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