[RFC PATCH 06/12] ebpf/uBPF: Add qemu_ubpf_run_once excute real ebpf program

From: Zhang Chen <chen.zhang@intel.com>
To: "Jason Wang" <jasowang@redhat.com>,
	qemu-dev <qemu-devel@nongnu.org>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Daniel P. Berrangé" <berrange@redhat.com>,
	"Eduardo Habkost" <eduardo@habkost.net>,
	"Eric Blake" <eblake@redhat.com>,
	"Markus Armbruster" <armbru@redhat.com>
Cc: Zhang Chen <chen.zhang@intel.com>,
	Peter Maydell <peter.maydell@linaro.org>,
	Thomas Huth <thuth@redhat.com>,
	Laurent Vivier <lvivier@redhat.com>,
	Yuri Benditovich <yuri.benditovich@daynix.com>,
	Andrew Melnychenko <andrew@daynix.com>
Subject: [RFC PATCH 06/12] ebpf/uBPF: Add qemu_ubpf_run_once excute real ebpf program
Date: Fri, 17 Jun 2022 15:36:24 +0800	[thread overview]
Message-ID: <20220617073630.535914-7-chen.zhang@intel.com> (raw)
In-Reply-To: <20220617073630.535914-1-chen.zhang@intel.com>

Before running this function, we need to ensure that the
userspace ebpf program has been loaded correctly.

Signed-off-by: Zhang Chen <chen.zhang@intel.com>
---
 ebpf/ubpf-stub.c |  6 ++++++
 ebpf/ubpf.c      | 16 ++++++++++++++++
 ebpf/ubpf.h      |  2 ++
 3 files changed, 24 insertions(+)

diff --git a/ebpf/ubpf-stub.c b/ebpf/ubpf-stub.c
index 885bd954b7..70da421629 100644
--- a/ebpf/ubpf-stub.c
+++ b/ebpf/ubpf-stub.c
@@ -27,3 +27,9 @@ int qemu_ubpf_prepare(UbpfState *u_ebpf, char *code_path)
 {
     return 0;
 }
+
+uint64_t qemu_ubpf_run_once(UbpfState *u_ebpf, void *target,
+                            size_t target_len)
+{
+    return 0;
+}
diff --git a/ebpf/ubpf.c b/ebpf/ubpf.c
index d65fffeda3..8ac513c7ed 100644
--- a/ebpf/ubpf.c
+++ b/ebpf/ubpf.c
@@ -199,3 +199,19 @@ int qemu_ubpf_prepare(UbpfState *u_ebpf, char *code_path)
 
     return 0;
 }
+
+uint64_t qemu_ubpf_run_once(UbpfState *u_ebpf, void *target,
+                            size_t target_len)
+{
+    uint64_t result;
+
+    if (u_ebpf->jit) {
+        result = u_ebpf->fn(target, target_len);
+    } else {
+        if (ubpf_exec(u_ebpf->vm, target, target_len, &result) < 0) {
+            result = UINT64_MAX;
+        }
+    }
+
+    return result;
+}
diff --git a/ebpf/ubpf.h b/ebpf/ubpf.h
index 9a35efbeb6..fc40e84e51 100644
--- a/ebpf/ubpf.h
+++ b/ebpf/ubpf.h
@@ -38,5 +38,7 @@ bool qemu_ubpf_read_code(UbpfState *u_ebpf, char *path);
 bool qemu_ubpf_read_target(UbpfState *u_ebpf, char *path);
 void qemu_ubpf_init_jit(UbpfState *u_ebpf, bool jit);
 int qemu_ubpf_prepare(UbpfState *u_ebpf, char *code_path);
+uint64_t qemu_ubpf_run_once(UbpfState *u_ebpf, void *target,
+                            size_t target_len);
 
 #endif /* QEMU_UBPF_H */
-- 
2.25.1


