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drm/i915/gvt: allow several MPT methods to be NULL 

Hypervisors are different, the MPT ops is a only superset of
all possibly supported hypervisors. There might be other way
out of the MPT to achieve same target. e.g. vfio-based kvmgt
won't provide map_gfn_to_mfn method to establish guest EPT
mapping for aperture, since it will be done in QEMU/KVM, MMIO
is also trapped elsewhere, etc.

Signed-off-by: Jike Song <jike.song@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Jike Song 2016-11-03 18:38:34 +08:00 committed by Zhenyu Wang
parent 40df6ea07a
commit 7b3343b7e8
1 changed files with 24 additions and 0 deletions
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24
drivers/gpu/drm/i915/gvt/mpt.h
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@ -64,6 +64,10 @@ static inline int intel_gvt_hypervisor_detect_host(void)
static inline int intel_gvt_hypervisor_host_init(struct device *dev,
void *gvt, const void *ops)
{
/* optional to provide */
if (!intel_gvt_host.mpt->host_init)
return 0;
return intel_gvt_host.mpt->host_init(dev, gvt, ops);
}
@ -73,6 +77,10 @@ static inline int intel_gvt_hypervisor_host_init(struct device *dev,
static inline void intel_gvt_hypervisor_host_exit(struct device *dev,
void *gvt)
{
/* optional to provide */
if (!intel_gvt_host.mpt->host_exit)
return;
intel_gvt_host.mpt->host_exit(dev, gvt);
}
@ -85,6 +93,10 @@ static inline void intel_gvt_hypervisor_host_exit(struct device *dev,
*/
static inline int intel_gvt_hypervisor_attach_vgpu(struct intel_vgpu *vgpu)
{
/* optional to provide */
if (!intel_gvt_host.mpt->attach_vgpu)
return 0;
return intel_gvt_host.mpt->attach_vgpu(vgpu, &vgpu->handle);
}
@ -97,6 +109,10 @@ static inline int intel_gvt_hypervisor_attach_vgpu(struct intel_vgpu *vgpu)
*/
static inline void intel_gvt_hypervisor_detach_vgpu(struct intel_vgpu *vgpu)
{
/* optional to provide */
if (!intel_gvt_host.mpt->detach_vgpu)
return;
intel_gvt_host.mpt->detach_vgpu(vgpu->handle);
}
@ -261,6 +277,10 @@ static inline int intel_gvt_hypervisor_map_gfn_to_mfn(
unsigned long mfn, unsigned int nr,
bool map)
{
/* a MPT implementation could have MMIO mapped elsewhere */
if (!intel_gvt_host.mpt->map_gfn_to_mfn)
return 0;
return intel_gvt_host.mpt->map_gfn_to_mfn(vgpu->handle, gfn, mfn, nr,
map);
}
@ -278,6 +298,10 @@ static inline int intel_gvt_hypervisor_map_gfn_to_mfn(
static inline int intel_gvt_hypervisor_set_trap_area(
struct intel_vgpu *vgpu, u64 start, u64 end, bool map)
{
/* a MPT implementation could have MMIO trapped elsewhere */
if (!intel_gvt_host.mpt->set_trap_area)
return 0;
return intel_gvt_host.mpt->set_trap_area(vgpu->handle, start, end, map);
}