linux-kernel - Re: [PATCH 06/17] mshv: SynIC port and connection hypercalls

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Date:   Tue, 29 Jun 2021 12:55:19 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Vineeth Pillai <viremana@...ux.microsoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org
Subject: Re: [PATCH 06/17] mshv: SynIC port and connection hypercalls

On Thu, Jun 10, 2021 at 02:19:28PM +0200, Vitaly Kuznetsov wrote:
> Vineeth Pillai <viremana@...ux.microsoft.com> writes:
> 
> > Hyper-V enables inter-partition communication through the port and
> > connection constructs. More details about ports and connections in
> > TLFS chapter 11.
> >
> > Implement hypercalls related to ports and connections for enabling
> > inter-partiion communication.
> >
> > Signed-off-by: Vineeth Pillai <viremana@...ux.microsoft.com>
> > ---
> >  drivers/hv/hv_call.c                   | 161 +++++++++++++++++++++++++
> >  drivers/hv/mshv.h                      |  12 ++
> >  include/asm-generic/hyperv-tlfs.h      |  55 +++++++++
> >  include/linux/hyperv.h                 |   9 --
> >  include/uapi/asm-generic/hyperv-tlfs.h |  76 ++++++++++++
> >  5 files changed, 304 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/hv/hv_call.c b/drivers/hv/hv_call.c
> > index 025d4e2b892f..57db3a8ac94a 100644
> > --- a/drivers/hv/hv_call.c
> > +++ b/drivers/hv/hv_call.c
> > @@ -742,3 +742,164 @@ int hv_call_translate_virtual_address(
> >  	return hv_status_to_errno(status);
> >  }
> >  
> > +
> > +int
> > +hv_call_create_port(u64 port_partition_id, union hv_port_id port_id,
> > +		    u64 connection_partition_id,
> > +		    struct hv_port_info *port_info,
> > +		    u8 port_vtl, u8 min_connection_vtl, int node)
> > +{
> > +	struct hv_create_port *input;
> > +	unsigned long flags;
> > +	int ret = 0;
> > +	int status;
> > +
> > +	do {
> > +		local_irq_save(flags);
> > +		input = (struct hv_create_port *)(*this_cpu_ptr(
> > +				hyperv_pcpu_input_arg));
> > +		memset(input, 0, sizeof(*input));
> > +
> > +		input->port_partition_id = port_partition_id;
> > +		input->port_id = port_id;
> > +		input->connection_partition_id = connection_partition_id;
> > +		input->port_info = *port_info;
> > +		input->port_vtl = port_vtl;
> > +		input->min_connection_vtl = min_connection_vtl;
> > +		input->proximity_domain_info =
> > +			numa_node_to_proximity_domain_info(node);
> > +		status = hv_do_hypercall(HVCALL_CREATE_PORT, input,
> > +					NULL) & HV_HYPERCALL_RESULT_MASK;
> > +		local_irq_restore(flags);
> > +		if (status == HV_STATUS_SUCCESS)
> > +			break;
> > +
> > +		if (status != HV_STATUS_INSUFFICIENT_MEMORY) {
> > +			pr_err("%s: %s\n",
> > +			       __func__, hv_status_to_string(status));
> > +			ret = -hv_status_to_errno(status);
> 
> In Nuno's "x86/hyperv: convert hyperv statuses to linux error codes"
> patch, hv_status_to_errno() already returns negatives:

Yes, this needs to be fixed otherwise one of the following patch has the
error handling check reversed.

Wei.