Re: [Xen-devel] [PATCH v2] vmx: Restore debug registers when injecting #DB traps

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Ross Lagerwall [mailto:ross.lagerwall@xxxxxxxxxx]
> Sent: Saturday, March 12, 2016 12:24 AM
> 
> Commit a929bee0e652 ("x86/vmx: Fix injection of #DB traps following
> XSA-156") prevents an infinite loop in certain #DB traps. However, it
> changed the behavior to not call hvm_hw_inject_trap() for #DB and #AC
> traps which which means that the debug registers are not restored
> correctly and nullified commit b56ae5b48c38 ("VMX: fix/adjust trap
> injection").
> 
> To fix this, restore the original code path through hvm_inject_trap(),
> but ensure that the struct hvm_trap is populated with all the required
> data.
> 
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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