Re: [Xen-devel] [PATCH] libxc/restore: Fix REC_TYPE_X86_PV_VCPU_XSAVE data auditing (take 2)

[Wei Liu <wl@xxxxxxx>]

On Tue, Feb 04, 2020 at 08:29:38PM +0000, Andrew Cooper wrote:
> It turns out that a bug (since forever) in Xen causes XSAVE records to have
> non-architectural behaviour on xsave-capable hardware, when a PV guest has not
> touched the state.
> 
> In such a case, the data record returned from Xen is 2*uint64_t, both claiming
> the (illegitimate) state of %xcr0 and %xcr0_accum being 0.
> 
> Adjust the bound in handle_x86_pv_vcpu_blob() to cope with this.
> 
> Fixes: 2a62c22715b "libxc/restore: Fix data auditing in 
> handle_x86_pv_vcpu_blob()"
> Reported-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Acked-by: Wei Liu <wl@xxxxxxx>

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