[Intel-gfx] [PATCH 03/21] drm/i915/gvt: remove enum hypervisor_type

Christoph Hellwig
2021-07-21T15:55:06Z

The only supported hypervisor is KVM, so don't bother with dead code
enumerating hypervisors.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/gpu/drm/i915/gvt/gvt.c | 17 +--
drivers/gpu/drm/i915/gvt/gvt.h | 1 -
drivers/gpu/drm/i915/gvt/hypercall.h | 6 --
drivers/gpu/drm/i915/gvt/kvmgt.c | 1 -
drivers/gpu/drm/i915/gvt/opregion.c | 150 ++++++---------------------
5 files changed, 34 insertions(+), 141 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 6d7938aacca4..ee09bba970af 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -41,11 +41,6 @@

struct intel_gvt_host intel_gvt_host;

-static const char * const supported_hypervisors[] = {
- [INTEL_GVT_HYPERVISOR_XEN] = "XEN",
- [INTEL_GVT_HYPERVISOR_KVM] = "KVM",
-};
-
static const struct intel_gvt_ops intel_gvt_ops = {
.emulate_cfg_read = intel_vgpu_emulate_cfg_read,
.emulate_cfg_write = intel_vgpu_emulate_cfg_write,
@@ -304,23 +299,13 @@ intel_gvt_register_hypervisor(const struct intel_gvt_mpt *m)
if (!intel_gvt_host.initialized)
return -ENODEV;

- if (m->type != INTEL_GVT_HYPERVISOR_KVM &&
- m->type != INTEL_GVT_HYPERVISOR_XEN)
- return -EINVAL;
-
intel_gvt_host.mpt = m;
- intel_gvt_host.hypervisor_type = m->type;
gvt = (void *)kdev_to_i915(intel_gvt_host.dev)->gvt;

ret = intel_gvt_hypervisor_host_init(intel_gvt_host.dev, gvt,
&intel_gvt_ops);
- if (ret < 0) {
- gvt_err("Failed to init %s hypervisor module\n",
- supported_hypervisors[intel_gvt_host.hypervisor_type]);
+ if (ret < 0)
return -ENODEV;
- }
- gvt_dbg_core("Running with hypervisor %s in host mode\n",
- supported_hypervisors[intel_gvt_host.hypervisor_type]);
return 0;
}
EXPORT_SYMBOL_GPL(intel_gvt_register_hypervisor);
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 0c0615602343..9b9fdbf9df10 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -59,7 +59,6 @@
struct intel_gvt_host {
struct device *dev;
bool initialized;
- int hypervisor_type;
const struct intel_gvt_mpt *mpt;
};

diff --git a/drivers/gpu/drm/i915/gvt/hypercall.h b/drivers/gpu/drm/i915/gvt/hypercall.h
index f33e3cbd0439..317983153645 100644
--- a/drivers/gpu/drm/i915/gvt/hypercall.h
+++ b/drivers/gpu/drm/i915/gvt/hypercall.h
@@ -37,17 +37,11 @@

struct device;

-enum hypervisor_type {
- INTEL_GVT_HYPERVISOR_XEN = 0,
- INTEL_GVT_HYPERVISOR_KVM,
-};
-
/*
* Specific GVT-g MPT modules function collections. Currently GVT-g supports
* both Xen and KVM by providing dedicated hypervisor-related MPT modules.
*/
struct intel_gvt_mpt {
- enum hypervisor_type type;
int (*host_init)(struct device *dev, void *gvt, const void *ops);
void (*host_exit)(struct device *dev, void *gvt);
int (*attach_vgpu)(void *vgpu, unsigned long *handle);
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 1ac98f8aba31..0d0902d7405d 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -2204,7 +2204,6 @@ static bool kvmgt_is_valid_gfn(unsigned long handle, unsigned long gfn)
}

static const struct intel_gvt_mpt kvmgt_mpt = {
- .type = INTEL_GVT_HYPERVISOR_KVM,
.host_init = kvmgt_host_init,
.host_exit = kvmgt_host_exit,
.attach_vgpu = kvmgt_attach_vgpu,
diff --git a/drivers/gpu/drm/i915/gvt/opregion.c b/drivers/gpu/drm/i915/gvt/opregion.c
index 33569b910ed5..286ac6d7c6ce 100644
--- a/drivers/gpu/drm/i915/gvt/opregion.c
+++ b/drivers/gpu/drm/i915/gvt/opregion.c
@@ -255,33 +255,6 @@ int intel_vgpu_init_opregion(struct intel_vgpu *vgpu)
return 0;
}

-static int map_vgpu_opregion(struct intel_vgpu *vgpu, bool map)
-{
- u64 mfn;
- int i, ret;
-
- for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++) {
- mfn = intel_gvt_hypervisor_virt_to_mfn(vgpu_opregion(vgpu)->va
- + i * PAGE_SIZE);
- if (mfn == INTEL_GVT_INVALID_ADDR) {
- gvt_vgpu_err("fail to get MFN from VA\n");
- return -EINVAL;
- }
- ret = intel_gvt_hypervisor_map_gfn_to_mfn(vgpu,
- vgpu_opregion(vgpu)->gfn[i],
- mfn, 1, map);
- if (ret) {
- gvt_vgpu_err("fail to map GFN to MFN, errno: %d\n",
- ret);
- return ret;
- }
- }
-
- vgpu_opregion(vgpu)->mapped = map;
-
- return 0;
-}
-
/**
* intel_vgpu_opregion_base_write_handler - Opregion base register write handler
*
@@ -294,34 +267,13 @@ static int map_vgpu_opregion(struct intel_vgpu *vgpu, bool map)
int intel_vgpu_opregion_base_write_handler(struct intel_vgpu *vgpu, u32 gpa)
{

- int i, ret = 0;
+ int i;

gvt_dbg_core("emulate opregion from kernel\n");

- switch (intel_gvt_host.hypervisor_type) {
- case INTEL_GVT_HYPERVISOR_KVM:
- for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++)
- vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i;
- break;
- case INTEL_GVT_HYPERVISOR_XEN:
- /**
- * Wins guest on Xengt will write this register twice: xen
- * hvmloader and windows graphic driver.
- */
- if (vgpu_opregion(vgpu)->mapped)
- map_vgpu_opregion(vgpu, false);
-
- for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++)
- vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i;
-
- ret = map_vgpu_opregion(vgpu, true);
- break;
- default:
- ret = -EINVAL;
- gvt_vgpu_err("not supported hypervisor\n");
- }
-
- return ret;
+ for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++)
+ vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i;
+ return 0;
}

/**
@@ -336,12 +288,7 @@ void intel_vgpu_clean_opregion(struct intel_vgpu *vgpu)
if (!vgpu_opregion(vgpu)->va)
return;

- if (intel_gvt_host.hypervisor_type == INTEL_GVT_HYPERVISOR_XEN) {
- if (vgpu_opregion(vgpu)->mapped)
- map_vgpu_opregion(vgpu, false);
- } else if (intel_gvt_host.hypervisor_type == INTEL_GVT_HYPERVISOR_KVM) {
- /* Guest opregion is released by VFIO */
- }
+ /* Guest opregion is released by VFIO */
free_pages((unsigned long)vgpu_opregion(vgpu)->va,
get_order(INTEL_GVT_OPREGION_SIZE));

@@ -470,39 +417,22 @@ int intel_vgpu_emulate_opregion_request(struct intel_vgpu *vgpu, u32 swsci)
u64 scic_pa = 0, parm_pa = 0;
int ret;

- switch (intel_gvt_host.hypervisor_type) {
- case INTEL_GVT_HYPERVISOR_XEN:
- scic = *((u32 *)vgpu_opregion(vgpu)->va +
- INTEL_GVT_OPREGION_SCIC);
- parm = *((u32 *)vgpu_opregion(vgpu)->va +
- INTEL_GVT_OPREGION_PARM);
- break;
- case INTEL_GVT_HYPERVISOR_KVM:
- scic_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
- INTEL_GVT_OPREGION_SCIC;
- parm_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
- INTEL_GVT_OPREGION_PARM;
-
- ret = intel_gvt_hypervisor_read_gpa(vgpu, scic_pa,
- &scic, sizeof(scic));
- if (ret) {
- gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
- ret, scic_pa, sizeof(scic));
- return ret;
- }
-
- ret = intel_gvt_hypervisor_read_gpa(vgpu, parm_pa,
- &parm, sizeof(parm));
- if (ret) {
- gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
- ret, scic_pa, sizeof(scic));
- return ret;
- }
+ scic_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
+ INTEL_GVT_OPREGION_SCIC;
+ parm_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
+ INTEL_GVT_OPREGION_PARM;
+ ret = intel_gvt_hypervisor_read_gpa(vgpu, scic_pa, &scic, sizeof(scic));
+ if (ret) {
+ gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
+ ret, scic_pa, sizeof(scic));
+ return ret;
+ }

- break;
- default:
- gvt_vgpu_err("not supported hypervisor\n");
- return -EINVAL;
+ ret = intel_gvt_hypervisor_read_gpa(vgpu, parm_pa, &parm, sizeof(parm));
+ if (ret) {
+ gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
+ ret, scic_pa, sizeof(scic));
+ return ret;
}

if (!(swsci & SWSCI_SCI_SELECT)) {
@@ -535,34 +465,20 @@ int intel_vgpu_emulate_opregion_request(struct intel_vgpu *vgpu, u32 swsci)
parm = 0;

out:
- switch (intel_gvt_host.hypervisor_type) {
- case INTEL_GVT_HYPERVISOR_XEN:
- *((u32 *)vgpu_opregion(vgpu)->va +
- INTEL_GVT_OPREGION_SCIC) = scic;
- *((u32 *)vgpu_opregion(vgpu)->va +
- INTEL_GVT_OPREGION_PARM) = parm;
- break;
- case INTEL_GVT_HYPERVISOR_KVM:
- ret = intel_gvt_hypervisor_write_gpa(vgpu, scic_pa,
- &scic, sizeof(scic));
- if (ret) {
- gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
- ret, scic_pa, sizeof(scic));
- return ret;
- }
-
- ret = intel_gvt_hypervisor_write_gpa(vgpu, parm_pa,
- &parm, sizeof(parm));
- if (ret) {
- gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
- ret, scic_pa, sizeof(scic));
- return ret;
- }
+ ret = intel_gvt_hypervisor_write_gpa(vgpu, scic_pa, &scic,
+ sizeof(scic));
+ if (ret) {
+ gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
+ ret, scic_pa, sizeof(scic));
+ return ret;
+ }

- break;
- default:
- gvt_vgpu_err("not supported hypervisor\n");
- return -EINVAL;
+ ret = intel_gvt_hypervisor_write_gpa(vgpu, parm_pa, &parm,
+ sizeof(parm));
+ if (ret) {
+ gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
+ ret, scic_pa, sizeof(scic));
+ return ret;
}

return 0;
--
2.30.2