From: Pierre Morel <pmorel@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org, frankja@linux.ibm.com,
david@redhat.com, thuth@redhat.com, cohuck@redhat.com,
imbrenda@linux.ibm.com, drjones@redhat.com, pbonzini@redhat.com
Subject: [kvm-unit-tests PATCH v4 1/3] s390x: pv: implement routine to share/unshare memory
Date: Thu, 21 Jan 2021 10:13:10 +0100 [thread overview]
Message-ID: <1611220392-22628-2-git-send-email-pmorel@linux.ibm.com> (raw)
In-Reply-To: <1611220392-22628-1-git-send-email-pmorel@linux.ibm.com>
When communicating with the host we need to share part of
the memory.
Let's implement the ultravisor calls for this.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Suggested-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Thomas Huth <thuth@redhat.com>
---
lib/s390x/asm/uv.h | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/lib/s390x/asm/uv.h b/lib/s390x/asm/uv.h
index 4c2fc48..8400026 100644
--- a/lib/s390x/asm/uv.h
+++ b/lib/s390x/asm/uv.h
@@ -71,4 +71,42 @@ static inline int uv_call(unsigned long r1, unsigned long r2)
return cc;
}
+static inline int share(unsigned long addr, u16 cmd)
+{
+ struct uv_cb_share uvcb = {
+ .header.cmd = cmd,
+ .header.len = sizeof(uvcb),
+ .paddr = addr
+ };
+ int cc;
+
+ cc = uv_call(0, (u64)&uvcb);
+ if (!cc && uvcb.header.rc == 0x0001)
+ return 0;
+
+ report_info("cc %d response code: %04x", cc, uvcb.header.rc);
+ return -1;
+}
+
+/*
+ * Guest 2 request to the Ultravisor to make a page shared with the
+ * hypervisor for IO.
+ *
+ * @addr: Real or absolute address of the page to be shared
+ */
+static inline int uv_set_shared(unsigned long addr)
+{
+ return share(addr, UVC_CMD_SET_SHARED_ACCESS);
+}
+
+/*
+ * Guest 2 request to the Ultravisor to make a page unshared.
+ *
+ * @addr: Real or absolute address of the page to be unshared
+ */
+static inline int uv_remove_shared(unsigned long addr)
+{
+ return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS);
+}
+
#endif
--
2.17.1
next prev parent reply other threads:[~2021-01-21 9:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-21 9:13 [kvm-unit-tests PATCH v4 0/3] s390x: css: pv: css test adaptation for PV Pierre Morel
2021-01-21 9:13 ` Pierre Morel [this message]
2021-01-21 9:20 ` [kvm-unit-tests PATCH v4 1/3] s390x: pv: implement routine to share/unshare memory Janosch Frank
2021-01-21 9:49 ` Janosch Frank
2021-01-21 9:52 ` Pierre Morel
2021-01-21 9:13 ` [kvm-unit-tests PATCH v4 2/3] s390x: define UV compatible I/O allocation Pierre Morel
2021-01-21 9:32 ` Thomas Huth
2021-01-22 7:55 ` Pierre Morel
2021-01-21 9:46 ` Janosch Frank
2021-01-21 9:57 ` Pierre Morel
2021-01-21 13:02 ` Pierre Morel
2021-01-21 13:43 ` Thomas Huth
2021-01-21 13:47 ` Pierre Morel
2021-01-21 13:56 ` Thomas Huth
2021-01-21 15:47 ` Pierre Morel
2021-01-21 13:48 ` Janosch Frank
2021-01-21 15:48 ` Pierre Morel
2021-01-21 13:33 ` Pierre Morel
2021-01-21 9:13 ` [kvm-unit-tests PATCH v4 3/3] s390x: css: pv: css test adaptation for PV Pierre Morel
2021-01-21 9:35 ` Thomas Huth
2021-01-21 13:25 ` Pierre Morel
2021-01-21 9:57 ` Janosch Frank
2021-01-21 13:25 ` Pierre Morel
2021-01-21 12:48 ` Cornelia Huck
2021-01-21 13:25 ` Pierre Morel
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