[PATCH V6 11/24] xen/mm: Make x86's XENMEM_resource_ioreq_server handling common

From: Oleksandr Tyshchenko <olekstysh@gmail.com>
To: xen-devel@lists.xenproject.org
Cc: "Julien Grall" <julien.grall@arm.com>,
	"Jan Beulich" <jbeulich@suse.com>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>, "Wei Liu" <wl@xen.org>,
	"George Dunlap" <george.dunlap@citrix.com>,
	"Ian Jackson" <iwj@xenproject.org>,
	"Julien Grall" <julien@xen.org>,
	"Stefano Stabellini" <sstabellini@kernel.org>,
	"Oleksandr Tyshchenko" <oleksandr_tyshchenko@epam.com>
Subject: [PATCH V6 11/24] xen/mm: Make x86's XENMEM_resource_ioreq_server handling common
Date: Fri, 29 Jan 2021 03:48:39 +0200	[thread overview]
Message-ID: <1611884932-1851-12-git-send-email-olekstysh@gmail.com> (raw)
In-Reply-To: <1611884932-1851-1-git-send-email-olekstysh@gmail.com>

From: Julien Grall <julien.grall@arm.com>

As x86 implementation of XENMEM_resource_ioreq_server can be
re-used on Arm later on, this patch makes it common and removes
arch_acquire_resource (and the corresponding option) as unneeded.

Also re-order #include-s alphabetically.

This support is going to be used on Arm to be able run device
emulator outside of Xen hypervisor.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Paul Durrant <paul@xen.org>
[On Arm only]
Tested-by: Wei Chen <Wei.Chen@arm.com>

---
Please note, this is a split/cleanup/hardening of Julien's PoC:
"Add support for Guest IO forwarding to a device emulator"

Changes RFC -> V1:
   - no changes

Changes V1 -> V2:
   - update the author of a patch

Changes V2 -> V3:
   - don't wrap #include <xen/ioreq.h>
   - limit the number of #ifdef-s
   - re-order #include-s alphabetically

Changes V3 -> V4:
   - rebase
   - Add Jan's R-b

Changes V4 -> V5:
   - add Paul's R-b
   - update patch description
   - remove ARCH_ACQUIRE_RESOURCE option, etc

Changes V5 -> V6:
   - no changes

---
---
 xen/arch/x86/Kconfig     |  1 -
 xen/arch/x86/mm.c        | 44 ---------------------------------
 xen/common/Kconfig       |  3 ---
 xen/common/memory.c      | 63 +++++++++++++++++++++++++++++++++++++++---------
 xen/include/asm-x86/mm.h |  4 ---
 xen/include/xen/mm.h     |  9 -------
 6 files changed, 51 insertions(+), 73 deletions(-)

diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
index ea9a9ea..abe0fce 100644
--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -6,7 +6,6 @@ config X86
 	select ACPI
 	select ACPI_LEGACY_TABLES_LOOKUP
 	select ARCH_SUPPORTS_INT128
-	select ARCH_ACQUIRE_RESOURCE
 	select COMPAT
 	select CORE_PARKING
 	select HAS_ALTERNATIVE
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 59eb5c8..4366ea3 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4587,50 +4587,6 @@ static int handle_iomem_range(unsigned long s, unsigned long e, void *p)
     return err || s > e ? err : _handle_iomem_range(s, e, p);
 }
 
-int arch_acquire_resource(struct domain *d, unsigned int type,
-                          unsigned int id, unsigned long frame,
-                          unsigned int nr_frames, xen_pfn_t mfn_list[])
-{
-    int rc;
-
-    switch ( type )
-    {
-#ifdef CONFIG_HVM
-    case XENMEM_resource_ioreq_server:
-    {
-        ioservid_t ioservid = id;
-        unsigned int i;
-
-        rc = -EINVAL;
-        if ( !is_hvm_domain(d) )
-            break;
-
-        if ( id != (unsigned int)ioservid )
-            break;
-
-        rc = 0;
-        for ( i = 0; i < nr_frames; i++ )
-        {
-            mfn_t mfn;
-
-            rc = hvm_get_ioreq_server_frame(d, id, frame + i, &mfn);
-            if ( rc )
-                break;
-
-            mfn_list[i] = mfn_x(mfn);
-        }
-        break;
-    }
-#endif
-
-    default:
-        rc = -EOPNOTSUPP;
-        break;
-    }
-
-    return rc;
-}
-
 long arch_memory_op(unsigned long cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
 {
     int rc;
diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index cf32a07..fa049a6 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -22,9 +22,6 @@ config GRANT_TABLE
 
 	  If unsure, say Y.
 
-config ARCH_ACQUIRE_RESOURCE
-	bool
-
 config HAS_ALTERNATIVE
 	bool
 
diff --git a/xen/common/memory.c b/xen/common/memory.c
index ccb4d49..2f274a6 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -8,22 +8,23 @@
  */
 
 #include <xen/domain_page.h>
-#include <xen/types.h>
+#include <xen/errno.h>
+#include <xen/event.h>
+#include <xen/grant_table.h>
+#include <xen/guest_access.h>
+#include <xen/hypercall.h>
+#include <xen/iocap.h>
+#include <xen/ioreq.h>
 #include <xen/lib.h>
+#include <xen/mem_access.h>
 #include <xen/mm.h>
+#include <xen/numa.h>
+#include <xen/paging.h>
 #include <xen/param.h>
 #include <xen/perfc.h>
 #include <xen/sched.h>
-#include <xen/event.h>
-#include <xen/paging.h>
-#include <xen/iocap.h>
-#include <xen/guest_access.h>
-#include <xen/hypercall.h>
-#include <xen/errno.h>
-#include <xen/numa.h>
-#include <xen/mem_access.h>
 #include <xen/trace.h>
-#include <xen/grant_table.h>
+#include <xen/types.h>
 #include <asm/current.h>
 #include <asm/hardirq.h>
 #include <asm/p2m.h>
@@ -1091,6 +1092,40 @@ static int acquire_grant_table(struct domain *d, unsigned int id,
     return 0;
 }
 
+static int acquire_ioreq_server(struct domain *d,
+                                unsigned int id,
+                                unsigned long frame,
+                                unsigned int nr_frames,
+                                xen_pfn_t mfn_list[])
+{
+#ifdef CONFIG_IOREQ_SERVER
+    ioservid_t ioservid = id;
+    unsigned int i;
+    int rc;
+
+    if ( !is_hvm_domain(d) )
+        return -EINVAL;
+
+    if ( id != (unsigned int)ioservid )
+        return -EINVAL;
+
+    for ( i = 0; i < nr_frames; i++ )
+    {
+        mfn_t mfn;
+
+        rc = hvm_get_ioreq_server_frame(d, id, frame + i, &mfn);
+        if ( rc )
+            return rc;
+
+        mfn_list[i] = mfn_x(mfn);
+    }
+
+    return 0;
+#else
+    return -EOPNOTSUPP;
+#endif
+}
+
 static int acquire_resource(
     XEN_GUEST_HANDLE_PARAM(xen_mem_acquire_resource_t) arg)
 {
@@ -1149,9 +1184,13 @@ static int acquire_resource(
                                  mfn_list);
         break;
 
+    case XENMEM_resource_ioreq_server:
+        rc = acquire_ioreq_server(d, xmar.id, xmar.frame, xmar.nr_frames,
+                                  mfn_list);
+        break;
+
     default:
-        rc = arch_acquire_resource(d, xmar.type, xmar.id, xmar.frame,
-                                   xmar.nr_frames, mfn_list);
+        rc = -EOPNOTSUPP;
         break;
     }
 
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index 1fdb4eb..041c158 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -640,8 +640,4 @@ static inline bool arch_mfn_in_directmap(unsigned long mfn)
     return mfn <= (virt_to_mfn(eva - 1) + 1);
 }
 
-int arch_acquire_resource(struct domain *d, unsigned int type,
-                          unsigned int id, unsigned long frame,
-                          unsigned int nr_frames, xen_pfn_t mfn_list[]);
-
 #endif /* __ASM_X86_MM_H__ */
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index 636a125..667f9da 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -612,13 +612,4 @@ static inline void put_page_alloc_ref(struct page_info *page)
     }
 }
 
-#ifndef CONFIG_ARCH_ACQUIRE_RESOURCE
-static inline int arch_acquire_resource(
-    struct domain *d, unsigned int type, unsigned int id, unsigned long frame,
-    unsigned int nr_frames, xen_pfn_t mfn_list[])
-{
-    return -EOPNOTSUPP;
-}
-#endif /* !CONFIG_ARCH_ACQUIRE_RESOURCE */
-
 #endif /* __XEN_MM_H__ */
-- 
2.7.4


