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xen-hvm.c: Add support for Xen access to vmport

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This adds synchronisation of the 6 vcpu registers (only 32bits of
them) that vmport.c needs between Xen and QEMU.

This is to avoid a 2nd and 3rd exchange between QEMU and Xen to
fetch and put these 6 vcpu registers used by the code in vmport.c
and vmmouse.c

The registers are passed in the new shared page provided by
HVM_PARAM_VMPORT_REGS_PFN.

Add new array to XenIOState that allows selection of current_cpu by
vcpu id.

Now pass XenIOState to handle_ioreq().

Add new routines regs_to_cpu(), regs_from_cpu(), and
handle_vmport_ioreq().

Signed-off-by: Don Slutz <dslutz@verizon.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Don Slutz 2014-10-20 15:49:12 -04:00 • committed by Stefano Stabellini
parent cbd5ac6991
commit 37f9e258b6
2 changed files with 118 additions and 5 deletions
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15
include/hw/xen/xen_common.h
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@ -164,4 +164,19 @@ void destroy_hvm_domain(bool reboot);
/* shutdown/destroy current domain because of an error */
void xen_shutdown_fatal_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
#ifdef HVM_PARAM_VMPORT_REGS_PFN
static inline int xen_get_vmport_regs_pfn(XenXC xc, domid_t dom,
unsigned long *vmport_regs_pfn)
{
return xc_get_hvm_param(xc, dom, HVM_PARAM_VMPORT_REGS_PFN,
vmport_regs_pfn);
}
#else
static inline int xen_get_vmport_regs_pfn(XenXC xc, domid_t dom,
unsigned long *vmport_regs_pfn)
{
return -ENOSYS;
}
#endif
#endif /* QEMU_HW_XEN_COMMON_H */