WHPX: refactor load library
This refactors the load library of WHV libraries to make it more modular. It makes a helper routine that can be called on demand. This allows future expansion of load library/functions to support functionality that is dependent on some feature being available. Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com> Message-Id: <MW2PR2101MB1116578040BE1F0C1B662318C0760@MW2PR2101MB1116.namprd21.prod.outlook.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -50,5 +50,9 @@ extern struct WHPDispatch whp_dispatch;
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bool init_whp_dispatch(void);
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typedef enum WHPFunctionList {
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WINHV_PLATFORM_FNS_DEFAULT,
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WINHV_EMULATION_FNS_DEFAULT,
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} WHPFunctionList;
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#endif /* WHP_DISPATCH_H */
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@ -1355,6 +1355,58 @@ static void whpx_handle_interrupt(CPUState *cpu, int mask)
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}
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}
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/*
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* Load the functions from the given library, using the given handle. If a
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* handle is provided, it is used, otherwise the library is opened. The
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* handle will be updated on return with the opened one.
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*/
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static bool load_whp_dispatch_fns(HMODULE *handle,
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WHPFunctionList function_list)
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{
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HMODULE hLib = *handle;
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#define WINHV_PLATFORM_DLL "WinHvPlatform.dll"
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#define WINHV_EMULATION_DLL "WinHvEmulation.dll"
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#define WHP_LOAD_FIELD(return_type, function_name, signature) \
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whp_dispatch.function_name = \
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(function_name ## _t)GetProcAddress(hLib, #function_name); \
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if (!whp_dispatch.function_name) { \
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error_report("Could not load function %s", #function_name); \
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goto error; \
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} \
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#define WHP_LOAD_LIB(lib_name, handle_lib) \
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if (!handle_lib) { \
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handle_lib = LoadLibrary(lib_name); \
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if (!handle_lib) { \
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error_report("Could not load library %s.", lib_name); \
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goto error; \
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} \
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} \
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switch (function_list) {
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case WINHV_PLATFORM_FNS_DEFAULT:
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WHP_LOAD_LIB(WINHV_PLATFORM_DLL, hLib)
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LIST_WINHVPLATFORM_FUNCTIONS(WHP_LOAD_FIELD)
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break;
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case WINHV_EMULATION_FNS_DEFAULT:
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WHP_LOAD_LIB(WINHV_EMULATION_DLL, hLib)
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LIST_WINHVEMULATION_FUNCTIONS(WHP_LOAD_FIELD)
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break;
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}
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*handle = hLib;
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return true;
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error:
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if (hLib) {
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FreeLibrary(hLib);
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}
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return false;
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}
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/*
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* Partition support
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*/
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@ -1490,51 +1542,30 @@ static void whpx_type_init(void)
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bool init_whp_dispatch(void)
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{
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const char *lib_name;
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HMODULE hLib;
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if (whp_dispatch_initialized) {
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return true;
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}
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#define WHP_LOAD_FIELD(return_type, function_name, signature) \
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whp_dispatch.function_name = \
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(function_name ## _t)GetProcAddress(hLib, #function_name); \
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if (!whp_dispatch.function_name) { \
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error_report("Could not load function %s from library %s.", \
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#function_name, lib_name); \
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goto error; \
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} \
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lib_name = "WinHvPlatform.dll";
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hWinHvPlatform = LoadLibrary(lib_name);
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if (!hWinHvPlatform) {
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error_report("Could not load library %s.", lib_name);
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if (!load_whp_dispatch_fns(&hWinHvPlatform, WINHV_PLATFORM_FNS_DEFAULT)) {
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goto error;
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}
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hLib = hWinHvPlatform;
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LIST_WINHVPLATFORM_FUNCTIONS(WHP_LOAD_FIELD)
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lib_name = "WinHvEmulation.dll";
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hWinHvEmulation = LoadLibrary(lib_name);
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if (!hWinHvEmulation) {
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error_report("Could not load library %s.", lib_name);
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if (!load_whp_dispatch_fns(&hWinHvEmulation, WINHV_EMULATION_FNS_DEFAULT)) {
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goto error;
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}
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hLib = hWinHvEmulation;
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LIST_WINHVEMULATION_FUNCTIONS(WHP_LOAD_FIELD)
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whp_dispatch_initialized = true;
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return true;
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error:
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if (hWinHvPlatform) {
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FreeLibrary(hWinHvPlatform);
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}
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if (hWinHvEmulation) {
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FreeLibrary(hWinHvEmulation);
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}
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return false;
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}
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