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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 17/29] Ovmf/Xen: refactor XenBusDxe hypercall implementation
This refactors the Xen hypercall implementation that is part of the
XenBusDxe driver, in preparation of splitting it off entirely into
a XenHypercallLib library. This involves:
- removing the dependency on XENBUS_DEVICE* pointers in the XenHypercall()
prototypes
- moving the discovered hyperpage address to a global variable
- moving XenGetSharedInfoPage() to its only user XenBusDxe.c (the shared info
page is not strictly part of the Xen hypercall interface, and is not used
by other expected users of XenHypercallLib such as the Xen console version
of SerialPortLib
- reimplement XenHypercall2() in C and move the indexing of the hyperpage
there; the existing asm implementations are renamed to __XenHypercall2() and
invoked from the new C implementation.
Contributed-under: TianoCore Contribution Agreement 1.0
Acked-by: Laszlo Ersek <lersek@xxxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
OvmfPkg/XenBusDxe/EventChannel.c | 11 +++--------
OvmfPkg/XenBusDxe/GrantTable.c | 4 ++--
OvmfPkg/XenBusDxe/Ia32/hypercall.nasm | 6 +++---
OvmfPkg/XenBusDxe/X64/hypercall.nasm | 6 +++---
OvmfPkg/XenBusDxe/XenBusDxe.c | 44
+++++++++++++++++++++++++++++++++++++++++++-
OvmfPkg/XenBusDxe/XenBusDxe.h | 1 -
OvmfPkg/XenBusDxe/XenHypercall.c | 61
+++++++++++++++++++++++++------------------------------------
OvmfPkg/XenBusDxe/XenHypercall.h | 28 +++-------------------------
OvmfPkg/XenBusDxe/XenStore.c | 4 ++--
9 files changed, 84 insertions(+), 81 deletions(-)
diff --git a/OvmfPkg/XenBusDxe/EventChannel.c b/OvmfPkg/XenBusDxe/EventChannel.c
index 03efaf9cb904..a86323e6adfd 100644
--- a/OvmfPkg/XenBusDxe/EventChannel.c
+++ b/OvmfPkg/XenBusDxe/EventChannel.c
@@ -28,7 +28,7 @@ XenEventChannelNotify (
evtchn_send_t Send;
Send.port = Port;
- ReturnCode = XenHypercallEventChannelOp (Dev, EVTCHNOP_send, &Send);
+ ReturnCode = XenHypercallEventChannelOp (EVTCHNOP_send, &Send);
return (UINT32)ReturnCode;
}
@@ -40,15 +40,12 @@ XenBusEventChannelAllocate (
OUT evtchn_port_t *Port
)
{
- XENBUS_PRIVATE_DATA *Private;
evtchn_alloc_unbound_t Parameter;
UINT32 ReturnCode;
- Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
-
Parameter.dom = DOMID_SELF;
Parameter.remote_dom = DomainId;
- ReturnCode = (UINT32)XenHypercallEventChannelOp (Private->Dev,
+ ReturnCode = (UINT32)XenHypercallEventChannelOp (
EVTCHNOP_alloc_unbound,
&Parameter);
if (ReturnCode != 0) {
@@ -79,10 +76,8 @@ XenBusEventChannelClose (
IN evtchn_port_t Port
)
{
- XENBUS_PRIVATE_DATA *Private;
evtchn_close_t Close;
- Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
Close.port = Port;
- return (UINT32)XenHypercallEventChannelOp (Private->Dev, EVTCHNOP_close,
&Close);
+ return (UINT32)XenHypercallEventChannelOp (EVTCHNOP_close, &Close);
}
diff --git a/OvmfPkg/XenBusDxe/GrantTable.c b/OvmfPkg/XenBusDxe/GrantTable.c
index 8405edc51bc4..53cb99f0e004 100644
--- a/OvmfPkg/XenBusDxe/GrantTable.c
+++ b/OvmfPkg/XenBusDxe/GrantTable.c
@@ -161,7 +161,7 @@ XenGrantTableInit (
Parameters.idx = Index;
Parameters.space = XENMAPSPACE_grant_table;
Parameters.gpfn = (xen_pfn_t) ((UINTN) GrantTable >> EFI_PAGE_SHIFT) +
Index;
- ReturnCode = XenHypercallMemoryOp (Dev, XENMEM_add_to_physmap,
&Parameters);
+ ReturnCode = XenHypercallMemoryOp (XENMEM_add_to_physmap, &Parameters);
if (ReturnCode != 0) {
DEBUG ((EFI_D_ERROR, "Xen GrantTable, add_to_physmap hypercall error:
%d\n", ReturnCode));
}
@@ -184,7 +184,7 @@ XenGrantTableDeinit (
Parameters.domid = DOMID_SELF;
Parameters.gpfn = (xen_pfn_t) ((UINTN) GrantTable >> EFI_PAGE_SHIFT) +
Index;
DEBUG ((EFI_D_INFO, "Xen GrantTable, removing %X\n", Parameters.gpfn));
- ReturnCode = XenHypercallMemoryOp (Dev, XENMEM_remove_from_physmap,
&Parameters);
+ ReturnCode = XenHypercallMemoryOp (XENMEM_remove_from_physmap,
&Parameters);
if (ReturnCode != 0) {
DEBUG ((EFI_D_ERROR, "Xen GrantTable, remove_from_physmap hypercall
error: %d\n", ReturnCode));
}
diff --git a/OvmfPkg/XenBusDxe/Ia32/hypercall.nasm
b/OvmfPkg/XenBusDxe/Ia32/hypercall.nasm
index 8547c30b81ee..e0fa71bb5ba8 100644
--- a/OvmfPkg/XenBusDxe/Ia32/hypercall.nasm
+++ b/OvmfPkg/XenBusDxe/Ia32/hypercall.nasm
@@ -2,13 +2,13 @@ SECTION .text
; INTN
; EFIAPI
-; XenHypercall2 (
+; __XenHypercall2 (
; IN VOID *HypercallAddr,
; IN OUT INTN Arg1,
; IN OUT INTN Arg2
; );
-global ASM_PFX(XenHypercall2)
-ASM_PFX(XenHypercall2):
+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
diff --git a/OvmfPkg/XenBusDxe/X64/hypercall.nasm
b/OvmfPkg/XenBusDxe/X64/hypercall.nasm
index 177f271ef094..5e6a0c05c5c4 100644
--- a/OvmfPkg/XenBusDxe/X64/hypercall.nasm
+++ b/OvmfPkg/XenBusDxe/X64/hypercall.nasm
@@ -3,13 +3,13 @@ SECTION .text
; INTN
; EFIAPI
-; XenHypercall2 (
+; __XenHypercall2 (
; IN VOID *HypercallAddr,
; IN OUT INTN Arg1,
; IN OUT INTN Arg2
; );
-global ASM_PFX(XenHypercall2)
-ASM_PFX(XenHypercall2):
+global ASM_PFX(__XenHypercall2)
+ASM_PFX(__XenHypercall2):
push rdi
push rsi
; Copy HypercallAddr to rax
diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.c b/OvmfPkg/XenBusDxe/XenBusDxe.c
index 7a7fd82d559d..d333b331b6db 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.c
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.c
@@ -34,6 +34,8 @@
#include "XenStore.h"
#include "XenBus.h"
+#include <IndustryStandard/Xen/hvm/params.h>
+#include <IndustryStandard/Xen/memory.h>
///
/// Driver Binding Protocol instance
@@ -52,6 +54,46 @@ STATIC EFI_LOCK mMyDeviceLock =
EFI_INITIALIZE_LOCK_VARIABLE (TPL_CALLBACK
STATIC XENBUS_DEVICE *mMyDevice = NULL;
/**
+ 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.
+**/
+STATIC
+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 (XENMEM_add_to_physmap, &Parameter) != 0) {
+ FreePages (Dev->SharedInfo, 1);
+ Dev->SharedInfo = NULL;
+ return EFI_LOAD_ERROR;
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
Unloads an image.
@param ImageHandle Handle that identifies the image to be
unloaded.
@@ -348,7 +390,7 @@ XenBusDxeDriverBindingStart (
MmioAddr = BarDesc->AddrRangeMin;
FreePool (BarDesc);
- Status = XenHyperpageInit (Dev);
+ Status = XenHyperpageInit ();
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "XenBus: Unable to retrieve the hyperpage.\n"));
Status = EFI_UNSUPPORTED;
diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.h b/OvmfPkg/XenBusDxe/XenBusDxe.h
index 80253b7d1ca9..9b7219906a69 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.h
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.h
@@ -91,7 +91,6 @@ struct _XENBUS_DEVICE {
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
LIST_ENTRY ChildList;
- VOID *Hyperpage;
shared_info_t *SharedInfo;
};
diff --git a/OvmfPkg/XenBusDxe/XenHypercall.c b/OvmfPkg/XenBusDxe/XenHypercall.c
index 34d92e76b7e3..19c34bdd0cec 100644
--- a/OvmfPkg/XenBusDxe/XenHypercall.c
+++ b/OvmfPkg/XenBusDxe/XenHypercall.c
@@ -23,9 +23,21 @@
#include <IndustryStandard/Xen/hvm/params.h>
#include <IndustryStandard/Xen/memory.h>
+STATIC VOID *HyperPage;
+
+//
+// Interface exposed by the ASM implementation of the core hypercall
+//
+INTN
+EFIAPI
+__XenHypercall2 (
+ IN VOID *HypercallAddr,
+ IN OUT INTN Arg1,
+ IN OUT INTN Arg2
+ );
+
EFI_STATUS
XenHyperpageInit (
- IN OUT XENBUS_DEVICE *Dev
)
{
EFI_HOB_GUID_TYPE *GuidHob;
@@ -36,24 +48,21 @@ XenHyperpageInit (
return EFI_NOT_FOUND;
}
XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);
- Dev->Hyperpage = XenInfo->HyperPages;
+ HyperPage = XenInfo->HyperPages;
return EFI_SUCCESS;
}
UINT64
XenHypercallHvmGetParam (
- IN XENBUS_DEVICE *Dev,
IN UINT32 Index
)
{
xen_hvm_param_t Parameter;
INTN Error;
- ASSERT (Dev->Hyperpage != NULL);
-
Parameter.domid = DOMID_SELF;
Parameter.index = Index;
- Error = XenHypercall2 ((UINT8*)Dev->Hyperpage + __HYPERVISOR_hvm_op * 32,
+ Error = XenHypercall2 (__HYPERVISOR_hvm_op,
HVMOP_get_param, (INTN) &Parameter);
if (Error != 0) {
DEBUG ((EFI_D_ERROR,
@@ -66,53 +75,33 @@ XenHypercallHvmGetParam (
INTN
XenHypercallMemoryOp (
- IN XENBUS_DEVICE *Dev,
IN UINTN Operation,
IN OUT VOID *Arguments
)
{
- ASSERT (Dev->Hyperpage != NULL);
- return XenHypercall2 ((UINT8*)Dev->Hyperpage + __HYPERVISOR_memory_op * 32,
+ return XenHypercall2 (__HYPERVISOR_memory_op,
Operation, (INTN) Arguments);
}
INTN
XenHypercallEventChannelOp (
- IN XENBUS_DEVICE *Dev,
IN INTN Operation,
IN OUT VOID *Arguments
)
{
- ASSERT (Dev->Hyperpage != NULL);
- return XenHypercall2 ((UINT8*)Dev->Hyperpage + __HYPERVISOR_event_channel_op
* 32,
+ return XenHypercall2 (__HYPERVISOR_event_channel_op,
Operation, (INTN) Arguments);
}
-EFI_STATUS
-XenGetSharedInfoPage (
- IN OUT XENBUS_DEVICE *Dev
+INTN
+EFIAPI
+XenHypercall2 (
+ IN INTN HypercallID,
+ IN OUT INTN Arg1,
+ IN OUT INTN Arg2
)
{
- xen_add_to_physmap_t Parameter;
+ ASSERT (HyperPage != NULL);
- 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;
+ return __XenHypercall2 ((UINT8*)HyperPage + HypercallID * 32, Arg1, Arg2);
}
diff --git a/OvmfPkg/XenBusDxe/XenHypercall.h b/OvmfPkg/XenBusDxe/XenHypercall.h
index 06693830e16e..9d49e33eb5af 100644
--- a/OvmfPkg/XenBusDxe/XenHypercall.h
+++ b/OvmfPkg/XenBusDxe/XenHypercall.h
@@ -18,9 +18,9 @@
/**
This function will put the two arguments in the right place (registers) and
- call HypercallAddr, which correspond to an entry in the hypercall pages.
+ invoke the hypercall identified by HypercallID.
- @param HypercallAddr A memory address where the hypercall to call is.
+ @param HypercallID The symbolic ID of the hypercall to be invoked
@param Arg1 First argument.
@param Arg2 Second argument.
@@ -29,7 +29,7 @@
INTN
EFIAPI
XenHypercall2 (
- IN VOID *HypercallAddr,
+ IN INTN HypercallID,
IN OUT INTN Arg1,
IN OUT INTN Arg2
);
@@ -44,27 +44,23 @@ XenHypercall2 (
**/
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,
UINT32 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.
@@ -73,7 +69,6 @@ XenHypercallHvmGetParam (
**/
INTN
XenHypercallMemoryOp (
- IN XENBUS_DEVICE *Dev,
IN UINTN Operation,
IN OUT VOID *Arguments
);
@@ -81,7 +76,6 @@ XenHypercallMemoryOp (
/**
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.
@@ -90,24 +84,8 @@ XenHypercallMemoryOp (
**/
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
diff --git a/OvmfPkg/XenBusDxe/XenStore.c b/OvmfPkg/XenBusDxe/XenStore.c
index 2df8f5348585..7ec1e634bc5c 100644
--- a/OvmfPkg/XenBusDxe/XenStore.c
+++ b/OvmfPkg/XenBusDxe/XenStore.c
@@ -1057,8 +1057,8 @@ XenStoreInit (
xs.Dev = Dev;
- xs.EventChannel = (evtchn_port_t)XenHypercallHvmGetParam (Dev,
HVM_PARAM_STORE_EVTCHN);
- XenStoreGpfn = (UINTN)XenHypercallHvmGetParam (Dev, HVM_PARAM_STORE_PFN);
+ xs.EventChannel = (evtchn_port_t)XenHypercallHvmGetParam
(HVM_PARAM_STORE_EVTCHN);
+ XenStoreGpfn = (UINTN)XenHypercallHvmGetParam (HVM_PARAM_STORE_PFN);
xs.XenStore = (VOID *) (XenStoreGpfn << EFI_PAGE_SHIFT);
DEBUG ((EFI_D_INFO, "XenBusInit: XenBus rings @%p, event channel %x\n",
xs.XenStore, xs.EventChannel));
--
1.8.3.2
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