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SubjectRe: [PATCH 06/17] mshv: SynIC port and connection hypercalls
On Wed, Jun 02, 2021 at 05:20:51PM +0000, Vineeth Pillai wrote:
> 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@linux.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);

This misses the check for NUMA_NO_NODE, so does the function for port
connection (see below).

I think it would actually be better to leave the check in
numa_node_to_proximity_domain_info to avoid problems like this.

Of course, adapting this approach means some call sites for that
function will need to be changed too.
---8<---
From 8705857c62b3e5f13d415736ca8b508c22e3f5ba Mon Sep 17 00:00:00 2001
From: Wei Liu <wei.liu@kernel.org>
Date: Wed, 30 Jun 2021 11:08:31 +0000
Subject: [PATCH] numa_node_to_proximity_domain_info should cope with
NUMA_NO_NODE
Signed-off-by: Wei Liu <wei.liu@kernel.org>
---
include/asm-generic/mshyperv.h | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index d9b91b8f63c8..44552b7a02ef 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -31,10 +31,14 @@ numa_node_to_proximity_domain_info(int node)
{
union hv_proximity_domain_info proximity_domain_info;

- proximity_domain_info.domain_id = node_to_pxm(node);
- proximity_domain_info.flags.reserved = 0;
- proximity_domain_info.flags.proximity_info_valid = 1;
- proximity_domain_info.flags.proximity_preferred = 1;
+ proximity_domain_info.as_uint64 = 0;
+
+ if (node != NUMA_NO_NODE) {
+ proximity_domain_info.domain_id = node_to_pxm(node);
+ proximity_domain_info.flags.reserved = 0;
+ proximity_domain_info.flags.proximity_info_valid = 1;
+ proximity_domain_info.flags.proximity_preferred = 1;
+ }

return proximity_domain_info;
}
--
2.30.2

[...]
> +int
> +hv_call_connect_port(u64 port_partition_id, union hv_port_id port_id,
> + u64 connection_partition_id,
> + union hv_connection_id connection_id,
> + struct hv_connection_info *connection_info,
> + u8 connection_vtl, int node)
> +{
> + struct hv_connect_port *input;
> + unsigned long flags;
> + int ret = 0, status;
> +
> + do {
> + local_irq_save(flags);
> + input = (struct hv_connect_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->connection_id = connection_id;
> + input->connection_info = *connection_info;
> + input->connection_vtl = connection_vtl;
> + input->proximity_domain_info =
> + numa_node_to_proximity_domain_info(node);

Here...

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