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OvmfPkg/XenBusDxe: Add support to make Xen Hypercalls. 

Change in V4:
- Replace the license by the commonly used file header text.
- add file header to XenHypercall.h (license, copyright, brief desc)

Change in V3:
- adding IA32 support. (not reviewed yet)
  both XenBusDxe/Ia32/hypercall.{S,asm} file are new

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

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16260 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Anthony PERARD 2014-10-29 06:49:10 +00:00 committed by jljusten
parent a154f42014
commit abcbbb14a4
9 changed files with 362 additions and 0 deletions
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22
OvmfPkg/XenBusDxe/Ia32/hypercall.S Normal file
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@ -0,0 +1,22 @@
# INTN
# EFIAPI
# XenHypercall2 (
# IN VOID *HypercallAddr,
# IN OUT INTN Arg1,
# IN OUT INTN Arg2
# );
ASM_GLOBAL ASM_PFX(XenHypercall2)
ASM_PFX(XenHypercall2):
# Save only ebx, ecx is supposed to be a scratch register and needs to be
# saved by the caller
push %ebx
# Copy HypercallAddr to eax
mov 8(%esp), %eax
# Copy Arg1 to the register expected by Xen
mov 12(%esp), %ebx
# Copy Arg2 to the register expected by Xen
mov 16(%esp), %ecx
# Call HypercallAddr
call *%eax
pop %ebx
ret

26
OvmfPkg/XenBusDxe/Ia32/hypercall.asm Normal file
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@ -0,0 +1,26 @@
.code
; INTN
; EFIAPI
; XenHypercall2 (
; IN VOID *HypercallAddr,
; IN OUT INTN Arg1,
; IN OUT INTN Arg2
; );
XenHypercall2 PROC
; Save only ebx, ecx is supposed to be a scratch register and needs to be
; saved by the caller
push ebx
; Copy HypercallAddr to eax
mov eax, [esp + 8]
; Copy Arg1 to the register expected by Xen
mov ebx, [esp + 12]
; Copy Arg2 to the register expected by Xen
mov ecx, [esp + 16]
; Call HypercallAddr
call eax
pop ebx
ret
XenHypercall2 ENDP
END

22
OvmfPkg/XenBusDxe/X64/hypercall.S Normal file
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@ -0,0 +1,22 @@
# 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

26
OvmfPkg/XenBusDxe/X64/hypercall.asm Normal file
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@ -0,0 +1,26 @@
.code
; 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

18
OvmfPkg/XenBusDxe/XenBusDxe.c
View File

@ -29,6 +29,8 @@
#include "XenBusDxe.h"
#include "XenHypercall.h"
///
/// Driver Binding Protocol instance
@ -264,6 +266,8 @@ 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.
**/
@ -295,6 +299,20 @@ XenBusDxeDriverBindingStart (
mMyDevice = Dev;
EfiReleaseLock (&mMyDeviceLock);
Status = XenHyperpageInit (Dev);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "XenBus: Unable to retrieve the hyperpage.\n"));
Status = EFI_UNSUPPORTED;
goto ErrorAllocated;
}
Status = XenGetSharedInfoPage (Dev);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "XenBus: Unable to get the shared info page.\n"));
Status = EFI_UNSUPPORTED;
goto ErrorAllocated;
}
Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,
NotifyExitBoot,
(VOID*) Dev,

5
OvmfPkg/XenBusDxe/XenBusDxe.h
View File

@ -70,6 +70,8 @@ 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
@ -83,6 +85,9 @@ struct _XENBUS_DEVICE {
EFI_DRIVER_BINDING_PROTOCOL *This;
EFI_HANDLE ControllerHandle;
EFI_EVENT ExitBootEvent;
VOID *Hyperpage;
shared_info_t *SharedInfo;
};
#endif

10
OvmfPkg/XenBusDxe/XenBusDxe.inf
View File

@ -34,6 +34,16 @@
DriverBinding.h
ComponentName.c
ComponentName.h
XenHypercall.c
XenHypercall.h
[Sources.IA32]
Ia32/hypercall.S
Ia32/hypercall.asm
[Sources.X64]
X64/hypercall.S
X64/hypercall.asm
[LibraryClasses]
UefiDriverEntryPoint

118
OvmfPkg/XenBusDxe/XenHypercall.c Normal file
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@ -0,0 +1,118 @@
/** @file
Functions to make Xen hypercalls.
Copyright (C) 2014, Citrix Ltd.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#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;
}

115
OvmfPkg/XenBusDxe/XenHypercall.h Normal file
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@ -0,0 +1,115 @@
/** @file
Functions declarations to make Xen hypercalls.
Copyright (C) 2014, Citrix Ltd.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#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