Re: [Xen-devel] [PATCH v4] kexec: implement STATUS hypercall to check if image is loaded

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Jan 18, 2017 at 11:46:13AM -0600, Eric DeVolder wrote:
> The tools that use kexec are asynchronous in nature and do not keep
> state changes. As such provide an hypercall to find out whether an
> image has been loaded for either type.
> 
> Note: No need to modify XSM as it has one size fits all check and
> does not check for subcommands.
> 
> Note: No need to check KEXEC_FLAG_IN_PROGRESS (and error out of
> kexec_status()) as this flag is set only once by the first/only
> cpu on the crash path.
> 
> Note: In kexec_status(), the use of test_bit() can also return
> EPERM, so the return value from test_bit() must be checked to
> ensure that kexec_status() always returns 0, 1 or -1, per the
> public header description.
> 
> Note: This is just the Xen side of the hypercall, kexec-tools patch
> to come separately.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Signed-off-by: Eric DeVolder <eric.devolder@xxxxxxxxxx>

Your v3 is already applied to staging.

Please submit a patch on top of staging branch.

Wei.

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