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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 04/18] OvmfPkg/XenBusDxe: Add support to make Xen Hypercalls.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
Change in V2:
- file header, copyright
- Add License
- Add push/pop instruction.
- fix types
- Comment of exported functions
- Improve coding style
- Add error handling in the main init function (of the drivers)
- Comment assembly
---
OvmfPkg/XenBusDxe/X64/hypercall.S | 23 +++++++
OvmfPkg/XenBusDxe/X64/hypercall.asm | 27 ++++++++
OvmfPkg/XenBusDxe/XenBusDxe.c | 22 ++++++
OvmfPkg/XenBusDxe/XenBusDxe.h | 5 ++
OvmfPkg/XenBusDxe/XenBusDxe.inf | 6 ++
OvmfPkg/XenBusDxe/XenHypercall.c | 134 ++++++++++++++++++++++++++++++++++++
OvmfPkg/XenBusDxe/XenHypercall.h | 100 +++++++++++++++++++++++++++
7 files changed, 317 insertions(+)
create mode 100644 OvmfPkg/XenBusDxe/X64/hypercall.S
create mode 100644 OvmfPkg/XenBusDxe/X64/hypercall.asm
create mode 100644 OvmfPkg/XenBusDxe/XenHypercall.c
create mode 100644 OvmfPkg/XenBusDxe/XenHypercall.h
diff --git a/OvmfPkg/XenBusDxe/X64/hypercall.S
b/OvmfPkg/XenBusDxe/X64/hypercall.S
new file mode 100644
index 0000000..3b18e48
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/X64/hypercall.S
@@ -0,0 +1,23 @@
+# Hypercall with 2 arguments
+# INTN
+# EFIAPI
+# XenHypercall2 (
+# IN VOID *HypercallAddr,
+# IN OUT INTN Arg1,
+# IN OUT INTN Arg2
+# );
+ASM_GLOBAL ASM_PFX(XenHypercall2)
+ASM_PFX(XenHypercall2):
+ push %rdi
+ push %rsi
+ # Copy HypercallAddr to rax
+ movq %rcx, %rax
+ # Copy Arg1 to the register expected by Xen
+ movq %rdx, %rdi
+ # Copy Arg2 to the register expected by Xen
+ movq %r8, %rsi
+ # Call HypercallAddr
+ call *%rax
+ pop %rsi
+ pop %rdi
+ ret
diff --git a/OvmfPkg/XenBusDxe/X64/hypercall.asm
b/OvmfPkg/XenBusDxe/X64/hypercall.asm
new file mode 100644
index 0000000..a39f240
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/X64/hypercall.asm
@@ -0,0 +1,27 @@
+.code
+
+; Hypercall with 2 arguments
+; INTN
+; EFIAPI
+; XenHypercall2 (
+; IN VOID *HypercallAddr,
+; IN OUT INTN Arg1,
+; IN OUT INTN Arg2
+; );
+XenHypercall2 PROC
+ push rdi
+ push rsi
+ ; Copy HypercallAddr to rax
+ mov rax, rcx
+ ; Copy Arg1 to the register expected by Xen
+ mov rdi, rdx
+ ; Copy Arg2 to the register expected by Xen
+ mov rsi, r8
+ ; Call HypercallAddr
+ call rax
+ pop rsi
+ pop rdi
+ ret
+XenHypercall2 ENDP
+
+END
diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.c b/OvmfPkg/XenBusDxe/XenBusDxe.c
index e125ed7..db88cb4 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.c
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.c
@@ -45,6 +45,8 @@
#include "XenBusDxe.h"
+#include "XenHypercall.h"
+
///
/// Driver Binding Protocol instance
@@ -279,6 +281,8 @@ NotifyExitBoot (
@retval EFI_SUCCESS The device was started.
@retval EFI_DEVICE_ERROR The device could not be started due to a
device error.Currently not implemented.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
lack of resources.
+ @retval EFI_UNSUPPORTED Something is missing on the system that
+ prevent to start the edvice.
@retval Others The driver failded to start the device.
**/
@@ -298,6 +302,20 @@ XenBusDxeDriverBindingStart (
Dev->This = This;
Dev->ControllerHandle = ControllerHandle;
+ Status = XenHyperpageInit (Dev);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_ERROR, "XenBus: Unable to retrieve the hyperpage."));
+ Status = EFI_UNSUPPORTED;
+ goto ErrorNoHyperpage;
+ }
+
+ Status = XenGetSharedInfoPage (Dev);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_ERROR, "XenBus: Unable to get the shared info page."));
+ Status = EFI_UNSUPPORTED;
+ goto ErrorNoHyperpage;
+ }
+
Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,
NotifyExitBoot,
(VOID*) Dev,
@@ -306,6 +324,10 @@ XenBusDxeDriverBindingStart (
mMyDevice = Dev;
return EFI_SUCCESS;
+
+ErrorNoHyperpage:
+ FreePool (Dev);
+ return Status;
}
/**
diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.h b/OvmfPkg/XenBusDxe/XenBusDxe.h
index 9e4860a..af0510a 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.h
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.h
@@ -86,6 +86,8 @@ extern EFI_COMPONENT_NAME_PROTOCOL gXenBusDxeComponentName;
//
// Other stuff
//
+#include <IndustryStandard/Xen/xen.h>
+
#define PCI_VENDOR_ID_XEN 0x5853
#define PCI_DEVICE_ID_XEN_PLATFORM 0x0001
@@ -99,6 +101,9 @@ struct _XENBUS_DEVICE {
EFI_DRIVER_BINDING_PROTOCOL *This;
EFI_HANDLE ControllerHandle;
EFI_EVENT ExitBootEvent;
+
+ VOID *Hyperpage;
+ shared_info_t *SharedInfo;
};
#endif
diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.inf b/OvmfPkg/XenBusDxe/XenBusDxe.inf
index b4d7551..edc3e51 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.inf
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.inf
@@ -31,6 +31,12 @@
DriverBinding.h
ComponentName.c
ComponentName.h
+ XenHypercall.c
+ XenHypercall.h
+
+[Sources.X64]
+ X64/hypercall.S
+ X64/hypercall.asm
[LibraryClasses]
UefiDriverEntryPoint
diff --git a/OvmfPkg/XenBusDxe/XenHypercall.c b/OvmfPkg/XenBusDxe/XenHypercall.c
new file mode 100644
index 0000000..2e1f361
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/XenHypercall.c
@@ -0,0 +1,134 @@
+/** @file
+ Functions to make Xen hypercalls.
+
+ Copyright (C) 2014, Citrix Ltd.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+**/
+
+#include <PiDxe.h>
+#include <Library/HobLib.h>
+#include <Guid/XenInfo.h>
+
+#include "XenBusDxe.h"
+#include "XenHypercall.h"
+
+#include <IndustryStandard/Xen/hvm/params.h>
+#include <IndustryStandard/Xen/memory.h>
+
+EFI_STATUS
+XenHyperpageInit (
+ IN OUT XENBUS_DEVICE *Dev
+ )
+{
+ EFI_HOB_GUID_TYPE *GuidHob;
+ EFI_XEN_INFO *XenInfo;
+
+ GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
+ if (GuidHob == NULL) {
+ return EFI_NOT_FOUND;
+ }
+ XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
+ Dev->Hyperpage = XenInfo->HyperPages;
+ return EFI_SUCCESS;
+}
+
+UINT64
+XenHypercallHvmGetParam (
+ IN XENBUS_DEVICE *Dev,
+ IN INTN Index
+ )
+{
+ xen_hvm_param_t Parameter;
+ INTN Error;
+
+ ASSERT (Dev->Hyperpage != NULL);
+
+ Parameter.domid = DOMID_SELF;
+ Parameter.index = Index;
+ Error = XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_hvm_op * 32,
+ HVMOP_get_param, (INTN) &Parameter);
+ if (Error != 0) {
+ DEBUG ((EFI_D_ERROR,
+ "XenHypercall: Error %d trying to get HVM parameter %d\n",
+ Error, Index));
+ return 0;
+ }
+ return Parameter.value;
+}
+
+INTN
+XenHypercallMemoryOp (
+ IN XENBUS_DEVICE *Dev,
+ IN UINTN Operation,
+ IN OUT VOID *Arguments
+ )
+{
+ ASSERT (Dev->Hyperpage != NULL);
+ return XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_memory_op * 32,
+ Operation, (INTN) Arguments);
+}
+
+INTN
+XenHypercallEventChannelOp (
+ IN XENBUS_DEVICE *Dev,
+ IN INTN Operation,
+ IN OUT VOID *Arguments
+ )
+{
+ ASSERT (Dev->Hyperpage != NULL);
+ return XenHypercall2 (Dev->Hyperpage + __HYPERVISOR_event_channel_op * 32,
+ Operation, (INTN) Arguments);
+}
+
+EFI_STATUS
+XenGetSharedInfoPage (
+ IN OUT XENBUS_DEVICE *Dev
+ )
+{
+ xen_add_to_physmap_t Parameter;
+
+ ASSERT (Dev->SharedInfo == NULL);
+
+ Parameter.domid = DOMID_SELF;
+ Parameter.space = XENMAPSPACE_shared_info;
+ Parameter.idx = 0;
+
+ //
+ // using reserved page because the page is not released when linux is
+ // starting because of the add_to_physmap. QEMU might try to access the
+ // page, and fail because it have no right to do so (segv).
+ //
+ Dev->SharedInfo = AllocateReservedPages (1);
+ Parameter.gpfn = (UINTN) Dev->SharedInfo >> EFI_PAGE_SHIFT;
+ if (XenHypercallMemoryOp (Dev, XENMEM_add_to_physmap, &Parameter) != 0) {
+ FreePages (Dev->SharedInfo, 1);
+ Dev->SharedInfo = NULL;
+ return EFI_LOAD_ERROR;
+ }
+
+ return EFI_SUCCESS;
+}
diff --git a/OvmfPkg/XenBusDxe/XenHypercall.h b/OvmfPkg/XenBusDxe/XenHypercall.h
new file mode 100644
index 0000000..29eaf9f
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/XenHypercall.h
@@ -0,0 +1,100 @@
+#ifndef __XENBUS_DXE_HYPERCALL_H__
+#define __XENBUS_DXE_HYPERCALL_H__
+
+typedef struct _XENBUS_DEVICE XENBUS_DEVICE;
+
+/**
+ This function will put the two arguments in the right place (registers) and
+ call HypercallAddr, which correspond to an entry in the hypercall pages.
+
+ @param HypercallAddr A memory address where the hypercall to call is.
+ @param Arg1 First argument.
+ @param Arg2 Second argument.
+
+ @return Return 0 if success otherwise it return an errno.
+**/
+INTN
+EFIAPI
+XenHypercall2 (
+ IN VOID *HypercallAddr,
+ IN OUT INTN Arg1,
+ IN OUT INTN Arg2
+ );
+
+/**
+ Get the page where all hypercall are from the XenInfo hob.
+
+ @param Dev A XENBUS_DEVICE instance.
+
+ @retval EFI_NOT_FOUND hyperpage could not be found.
+ @retval EFI_SUCCESS Successfully retrieve the hyperpage pointer.
+**/
+EFI_STATUS
+XenHyperpageInit (
+ XENBUS_DEVICE *Dev
+ );
+
+/**
+ Return the value of the HVM parameter Index.
+
+ @param Dev A XENBUS_DEVICE instance.
+ @param Index The parameter to get, e.g. HVM_PARAM_STORE_EVTCHN.
+
+ @return The value of the asked parameter or 0 in case of error.
+**/
+UINT64
+XenHypercallHvmGetParam (
+ XENBUS_DEVICE *Dev,
+ INTN Index
+ );
+
+/**
+ Hypercall to do different operation on the memory.
+
+ @param Dev A XENBUS_DEVICE instance.
+ @param Operation The operation number, e.g. XENMEM_add_to_physmap.
+ @param Arguments The arguments associated to the operation.
+
+ @return Return the return value from the hypercall, 0 in case of success
+ otherwise, an error code.
+**/
+INTN
+XenHypercallMemoryOp (
+ IN XENBUS_DEVICE *Dev,
+ IN UINTN Operation,
+ IN OUT VOID *Arguments
+ );
+
+/**
+ Do an operation on the event channels.
+
+ @param Dev A XENBUS_DEVICE instance.
+ @param Operation The operation number, e.g. EVTCHNOP_send.
+ @param Arguments The argument associated to the operation.
+
+ @return Return the return value from the hypercall, 0 in case of success
+ otherwise, an error code.
+**/
+INTN
+XenHypercallEventChannelOp (
+ IN XENBUS_DEVICE *Dev,
+ IN INTN Operation,
+ IN OUT VOID *Arguments
+ );
+
+/**
+ Map the shared_info_t page into memory.
+
+ @param Dev A XENBUS_DEVICE instance.
+
+ @retval EFI_SUCCESS Dev->SharedInfo whill contain a pointer to
+ the shared info page
+ @retval EFI_LOAD_ERROR The shared info page could not be mapped. The
+ hypercall returned an error.
+**/
+EFI_STATUS
+XenGetSharedInfoPage (
+ IN OUT XENBUS_DEVICE *Dev
+ );
+
+#endif
--
Anthony PERARD
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