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hw/xen: Add foreignmem operations to allow redirection to internal emulation

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Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2023-01-02 01:13:46 +00:00
parent f80fad16af
commit 15e283c5b6
7 changed files with 88 additions and 26 deletions
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26
include/hw/xen/xen_backend_ops.h
View file

@ -214,6 +214,32 @@ static inline int qemu_xen_gnttab_unmap(xengnttab_handle *xgt,
return xen_gnttab_ops->unmap(xgt, start_address, refs, count);
}
struct foreignmem_backend_ops {
void *(*map)(uint32_t dom, void *addr, int prot, size_t pages,
xen_pfn_t *pfns, int *errs);
int (*unmap)(void *addr, size_t pages);
};
extern struct foreignmem_backend_ops *xen_foreignmem_ops;
static inline void *qemu_xen_foreignmem_map(uint32_t dom, void *addr, int prot,
size_t pages, xen_pfn_t *pfns,
int *errs)
{
if (!xen_foreignmem_ops) {
return NULL;
}
return xen_foreignmem_ops->map(dom, addr, prot, pages, pfns, errs);
}
static inline int qemu_xen_foreignmem_unmap(void *addr, size_t pages)
{
if (!xen_foreignmem_ops) {
return -ENOSYS;
}
return xen_foreignmem_ops->unmap(addr, pages);
}
void setup_xen_backend_ops(void);
#endif /* QEMU_XEN_BACKEND_OPS_H */

13
include/hw/xen/xen_common.h
View file

@ -32,19 +32,6 @@ typedef xc_interface xenforeignmemory_handle;
#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,
const xen_pfn_t arr[/*pages*/],
int err[/*pages*/])
{
if (err)
return xc_map_foreign_bulk(h, dom, prot, arr, err, pages);
else
return xc_map_foreign_pages(h, dom, prot, arr, pages);
}
#define xenforeignmemory_unmap(h, p, s) munmap(p, s * XC_PAGE_SIZE)
#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */
#include <xenforeignmemory.h>