Re: [Xen-devel] [PATCH] x86/svm: Fix handling of EFLAGS.RF on task switch

[Jürgen Groß <jgross@xxxxxxxx>]

On 03.12.19 23:30, Andrew Cooper wrote:
> VT-x updates RF before vmexit, so eflags written into the outgoing TSS happens
> to be correct.  SVM does not update RF before vmexit, and instead provides it
> via a bit in exitinfo2.
>
> In practice, needing RF set in the outgoing state occurs when a task gate is
> used to handle faults.
>
> Extend hvm_task_switch() with an extra_eflags parameter which gets fed into
> the outgoing TSS, and fill it in suitably from the SVM vmexit information.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Release-acked-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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