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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v2 5/5] xen: use libxendevicemodel when available
On Thu, 2 Mar 2017, Paul Durrant wrote:
> This patch modifies the wrapper functions in xen_common.h to use the
> new xendevicemodel interface if it is available along with compatibility
> code to use the old libxenctrl interface if it is not.
>
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> ---
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>
>
> v2:
> - Add a compat define for xenforeignmemory_close() since this is now
> used.
> ---
> include/hw/xen/xen_common.h | 115
> +++++++++++++++++++++++++++++++-------------
> xen-common.c | 8 +++
> 2 files changed, 90 insertions(+), 33 deletions(-)
>
> diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
> index 31cf25f..48444e5 100644
> --- a/include/hw/xen/xen_common.h
> +++ b/include/hw/xen/xen_common.h
> @@ -9,6 +9,7 @@
> #undef XC_WANT_COMPAT_EVTCHN_API
> #undef XC_WANT_COMPAT_GNTTAB_API
> #undef XC_WANT_COMPAT_MAP_FOREIGN_API
> +#undef XC_WANT_COMPAT_DEVICEMODEL_API
>
> #include <xenctrl.h>
> #include <xenstore.h>
> @@ -26,48 +27,95 @@ extern xc_interface *xen_xc;
> * We don't support Xen prior to 4.2.0.
> */
>
> +#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 490
> +
> +typedef xc_interface xendevicemodel_handle;
> +
> +#define xendevicemodel_open(l, f) xen_xc
> +
> +#define xendevicemodel_map_io_range_to_ioreq_server \
> + xc_hvm_map_io_range_to_ioreq_server
> +#define xendevicemodel_unmap_io_range_from_ioreq_server \
> + xc_hvm_unmap_io_range_from_ioreq_server
> +#define xendevicemodel_map_pcidev_to_ioreq_server \
> + xc_hvm_map_pcidev_to_ioreq_server
> +#define xendevicemodel_unmap_pcidev_from_ioreq_server \
> + xc_hvm_unmap_pcidev_from_ioreq_server
> +#define xendevicemodel_create_ioreq_server \
> + xc_hvm_create_ioreq_server
> +#define xendevicemodel_destroy_ioreq_server \
> + xc_hvm_destroy_ioreq_server
> +#define xendevicemodel_get_ioreq_server_info \
> + xc_hvm_get_ioreq_server_info
> +#define xendevicemodel_set_ioreq_server_state \
> + xc_hvm_set_ioreq_server_state
> +#define xendevicemodel_set_pci_intx_level \
> + xc_hvm_set_pci_intx_level
> +#define xendevicemodel_set_pci_link_route \
> + xc_hvm_set_pci_link_route
> +#define xendevicemodel_set_isa_irq_level \
> + xc_hvm_set_isa_irq_level
> +#define xendevicemodel_inject_msi \
> + xc_hvm_inject_msi
> +#define xendevicemodel_set_mem_type \
> + xc_hvm_set_mem_type
> +#define xendevicemodel_track_dirty_vram \
> + xc_hvm_track_dirty_vram
> +#define xendevicemodel_modified_memory \
> + xc_hvm_modified_memory
It does build correctly now for Xen < 4.9, however it breaks against
xen-unstable:
ERROR: configure test passed without -Werror but failed with -Werror.
This is probably a bug in the configure script. The failing command
will be at the bottom of config.log.
You can run configure with --disable-werror to bypass this check.
and config.log says:
config-temp/qemu-conf.c: In function 'main':
config-temp/qemu-conf.c:32:3: error: implicit declaration of function
'xc_hvm_set_mem_type' [-Werror=implicit-function-declaration]
config-temp/qemu-conf.c:32:3: error: nested extern declaration of
'xc_hvm_set_mem_type' [-Werror=nested-externs]
config-temp/qemu-conf.c:34:3: error: implicit declaration of function
'xc_hvm_inject_msi' [-Werror=implicit-function-declaration]
config-temp/qemu-conf.c:34:3: error: nested extern declaration of
'xc_hvm_inject_msi' [-Werror=nested-externs]
config-temp/qemu-conf.c:35:3: error: implicit declaration of function
'xc_hvm_create_ioreq_server' [-Werror=implicit-function-declaration]
config-temp/qemu-conf.c:35:3: error: nested extern declaration of
'xc_hvm_create_ioreq_server' [-Werror=nested-externs]
With -DXC_WANT_COMPAT_DEVICEMODEL_API=1:
In file included from /local/qemu-upstream/include/hw/xen/xen_backend.h:4:0,
from hw/block/xen_disk.c:27:
/local/qemu-upstream/include/hw/xen/xen_common.h: In function
'xen_set_mem_type':
/local/qemu-upstream/include/hw/xen/xen_common.h:78:5: error: implicit
declaration of function 'xc_hvm_set_mem_type'
[-Werror=implicit-function-declaration]
Only another comment (I guess you didn't see in my previous email):
could you please use static inline functions for compatibility rather
than macros? That way we are going to have some more compile time
checks. Or at least macros with parameters.
> +#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 490 */
> +
> +#include <xendevicemodel.h>
> +
> +#endif
> +
> +extern xendevicemodel_handle *xen_dmod;
> +
> static inline int xen_set_mem_type(domid_t domid, hvmmem_type_t type,
> uint64_t first_pfn, uint32_t nr)
> {
> - return xc_hvm_set_mem_type(xen_xc, domid, type, first_pfn, nr);
> + return xendevicemodel_set_mem_type(xen_dmod, domid, type, first_pfn,
> + nr);
> }
>
> static inline int xen_set_pci_intx_level(domid_t domid, uint16_t segment,
> uint8_t bus, uint8_t device,
> uint8_t intx, unsigned int level)
> {
> - return xc_hvm_set_pci_intx_level(xen_xc, domid, segment, bus, device,
> - intx, level);
> + return xendevicemodel_set_pci_intx_level(xen_dmod, domid, segment, bus,
> + device, intx, level);
> }
>
> static inline int xen_set_pci_link_route(domid_t domid, uint8_t link,
> uint8_t irq)
> {
> - return xc_hvm_set_pci_link_route(xen_xc, domid, link, irq);
> + return xendevicemodel_set_pci_link_route(xen_dmod, domid, link, irq);
> }
>
> static inline int xen_inject_msi(domid_t domid, uint64_t msi_addr,
> uint32_t msi_data)
> {
> - return xc_hvm_inject_msi(xen_xc, domid, msi_addr, msi_data);
> + return xendevicemodel_inject_msi(xen_dmod, domid, msi_addr, msi_data);
> }
>
> static inline int xen_set_isa_irq_level(domid_t domid, uint8_t irq,
> unsigned int level)
> {
> - return xc_hvm_set_isa_irq_level(xen_xc, domid, irq, level);
> + return xendevicemodel_set_isa_irq_level(xen_dmod, domid, irq, level);
> }
>
> static inline int xen_track_dirty_vram(domid_t domid, uint64_t first_pfn,
> uint32_t nr, unsigned long *bitmap)
> {
> - return xc_hvm_track_dirty_vram(xen_xc, domid, first_pfn, nr, bitmap);
> + return xendevicemodel_track_dirty_vram(xen_dmod, domid, first_pfn, nr,
> + bitmap);
> }
>
> static inline int xen_modified_memory(domid_t domid, uint64_t first_pfn,
> uint32_t nr)
> {
> - return xc_hvm_modified_memory(xen_xc, domid, first_pfn, nr);
> + return xendevicemodel_modified_memory(xen_dmod, domid, first_pfn, nr);
> }
>
> /* Xen 4.2 through 4.6 */
> @@ -97,6 +145,7 @@ typedef xc_gnttab xengnttab_handle;
> xc_gnttab_map_domain_grant_refs(h, c, d, r, p)
>
> #define xenforeignmemory_open(l, f) xen_xc
> +#define xenforeignmemory_close(h)
>
> static inline void *xenforeignmemory_map(xc_interface *h, uint32_t dom,
> int prot, size_t pages,
> @@ -285,8 +334,8 @@ static inline void xen_map_memory_section(domid_t dom,
> }
>
> trace_xen_map_mmio_range(ioservid, start_addr, end_addr);
> - xc_hvm_map_io_range_to_ioreq_server(xen_xc, dom, ioservid, 1,
> - start_addr, end_addr);
> + xendevicemodel_map_io_range_to_ioreq_server(xen_dmod, dom, ioservid, 1,
> + start_addr, end_addr);
> }
>
> static inline void xen_unmap_memory_section(domid_t dom,
> @@ -302,8 +351,8 @@ static inline void xen_unmap_memory_section(domid_t dom,
> }
>
> trace_xen_unmap_mmio_range(ioservid, start_addr, end_addr);
> - xc_hvm_unmap_io_range_from_ioreq_server(xen_xc, dom, ioservid,
> - 1, start_addr, end_addr);
> + xendevicemodel_unmap_io_range_from_ioreq_server(xen_dmod, dom, ioservid,
> + 1, start_addr, end_addr);
> }
>
> static inline void xen_map_io_section(domid_t dom,
> @@ -319,8 +368,8 @@ static inline void xen_map_io_section(domid_t dom,
> }
>
> trace_xen_map_portio_range(ioservid, start_addr, end_addr);
> - xc_hvm_map_io_range_to_ioreq_server(xen_xc, dom, ioservid, 0,
> - start_addr, end_addr);
> + xendevicemodel_map_io_range_to_ioreq_server(xen_dmod, dom, ioservid, 0,
> + start_addr, end_addr);
> }
>
> static inline void xen_unmap_io_section(domid_t dom,
> @@ -336,8 +385,8 @@ static inline void xen_unmap_io_section(domid_t dom,
> }
>
> trace_xen_unmap_portio_range(ioservid, start_addr, end_addr);
> - xc_hvm_unmap_io_range_from_ioreq_server(xen_xc, dom, ioservid,
> - 0, start_addr, end_addr);
> + xendevicemodel_unmap_io_range_from_ioreq_server(xen_dmod, dom, ioservid,
> + 0, start_addr, end_addr);
> }
>
> static inline void xen_map_pcidev(domid_t dom,
> @@ -350,10 +399,10 @@ static inline void xen_map_pcidev(domid_t dom,
>
> trace_xen_map_pcidev(ioservid, pci_bus_num(pci_dev->bus),
> PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn));
> - xc_hvm_map_pcidev_to_ioreq_server(xen_xc, dom, ioservid, 0,
> - pci_bus_num(pci_dev->bus),
> - PCI_SLOT(pci_dev->devfn),
> - PCI_FUNC(pci_dev->devfn));
> + xendevicemodel_map_pcidev_to_ioreq_server(xen_dmod, dom, ioservid, 0,
> + pci_bus_num(pci_dev->bus),
> + PCI_SLOT(pci_dev->devfn),
> + PCI_FUNC(pci_dev->devfn));
> }
>
> static inline void xen_unmap_pcidev(domid_t dom,
> @@ -366,18 +415,18 @@ static inline void xen_unmap_pcidev(domid_t dom,
>
> trace_xen_unmap_pcidev(ioservid, pci_bus_num(pci_dev->bus),
> PCI_SLOT(pci_dev->devfn),
> PCI_FUNC(pci_dev->devfn));
> - xc_hvm_unmap_pcidev_from_ioreq_server(xen_xc, dom, ioservid, 0,
> - pci_bus_num(pci_dev->bus),
> - PCI_SLOT(pci_dev->devfn),
> - PCI_FUNC(pci_dev->devfn));
> + xendevicemodel_unmap_pcidev_from_ioreq_server(xen_dmod, dom, ioservid, 0,
> + pci_bus_num(pci_dev->bus),
> + PCI_SLOT(pci_dev->devfn),
> + PCI_FUNC(pci_dev->devfn));
> }
>
> static inline void xen_create_ioreq_server(domid_t dom,
> ioservid_t *ioservid)
> {
> - int rc = xc_hvm_create_ioreq_server(xen_xc, dom,
> - HVM_IOREQSRV_BUFIOREQ_ATOMIC,
> - ioservid);
> + int rc = xendevicemodel_create_ioreq_server(xen_dmod, dom,
> + HVM_IOREQSRV_BUFIOREQ_ATOMIC,
> + ioservid);
>
> if (rc == 0) {
> trace_xen_ioreq_server_create(*ioservid);
> @@ -397,7 +446,7 @@ static inline void xen_destroy_ioreq_server(domid_t dom,
> }
>
> trace_xen_ioreq_server_destroy(ioservid);
> - xc_hvm_destroy_ioreq_server(xen_xc, dom, ioservid);
> + xendevicemodel_destroy_ioreq_server(xen_dmod, dom, ioservid);
> }
>
> static inline int xen_get_ioreq_server_info(domid_t dom,
> @@ -412,9 +461,9 @@ static inline int xen_get_ioreq_server_info(domid_t dom,
> bufioreq_evtchn);
> }
>
> - return xc_hvm_get_ioreq_server_info(xen_xc, dom, ioservid,
> - ioreq_pfn, bufioreq_pfn,
> - bufioreq_evtchn);
> + return xendevicemodel_get_ioreq_server_info(xen_dmod, dom, ioservid,
> + ioreq_pfn, bufioreq_pfn,
> + bufioreq_evtchn);
> }
>
> static inline int xen_set_ioreq_server_state(domid_t dom,
> @@ -426,8 +475,8 @@ static inline int xen_set_ioreq_server_state(domid_t dom,
> }
>
> trace_xen_ioreq_server_state(ioservid, enable);
> - return xc_hvm_set_ioreq_server_state(xen_xc, dom, ioservid,
> - enable);
> + return xendevicemodel_set_ioreq_server_state(xen_dmod, dom, ioservid,
> + enable);
> }
>
> #endif
> diff --git a/xen-common.c b/xen-common.c
> index 703e7a5..ae76150 100644
> --- a/xen-common.c
> +++ b/xen-common.c
> @@ -27,6 +27,7 @@
>
> xc_interface *xen_xc;
> xenforeignmemory_handle *xen_fmem;
> +xendevicemodel_handle *xen_dmod;
>
> static int store_dev_info(int domid, Chardev *cs, const char *string)
> {
> @@ -128,6 +129,13 @@ static int xen_init(MachineState *ms)
> xc_interface_close(xen_xc);
> return -1;
> }
> + xen_dmod = xendevicemodel_open(0, 0);
> + if (xen_dmod == NULL) {
> + xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
> + xenforeignmemory_close(xen_fmem);
> + xc_interface_close(xen_xc);
> + return -1;
> + }
> qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
>
> global_state_set_optional();
> --
> 2.1.4
>
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