We only depend on pvinfo register for GVT-g state detection,
not require hypervisor host detect any more.
Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gvt/gvt.c | 7 -------
drivers/gpu/drm/i915/gvt/hypercall.h | 1 -
drivers/gpu/drm/i915/gvt/kvmgt.c | 32 --------------------------------
drivers/gpu/drm/i915/gvt/mpt.h | 12 ------------
4 files changed, 52 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 7a7886644acf..c8002bf200ad 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -68,8 +68,6 @@ static const struct intel_gvt_ops intel_gvt_ops = {
*/
int intel_gvt_init_host(void)
{
- int ret;
-
if (intel_gvt_host.initialized)
return 0;
@@ -99,11 +97,6 @@ int intel_gvt_init_host(void)
if (!intel_gvt_host.mpt)
return -EINVAL;
- /* Try to detect if we're running in host instead of VM. */
- ret = intel_gvt_hypervisor_detect_host();
- if (ret)
- return -ENODEV;
-
gvt_dbg_core("Running with hypervisor %s in host mode\n",
supported_hypervisors[intel_gvt_host.hypervisor_type]);
diff --git a/drivers/gpu/drm/i915/gvt/hypercall.h b/drivers/gpu/drm/i915/gvt/hypercall.h
index 30e543f5a703..df7f33abd393 100644
--- a/drivers/gpu/drm/i915/gvt/hypercall.h
+++ b/drivers/gpu/drm/i915/gvt/hypercall.h
@@ -38,7 +38,6 @@
* both Xen and KVM by providing dedicated hypervisor-related MPT modules.
*/
struct intel_gvt_mpt {
- int (*detect_host)(void);
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 f29d2a27ccb1..080ca77abd22 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1248,37 +1248,6 @@ static void kvmgt_page_track_flush_slot(struct kvm *kvm,
spin_unlock(&kvm->mmu_lock);
}
-static bool kvmgt_check_guest(void)
-{
- unsigned int eax, ebx, ecx, edx;
- char s[12];
- unsigned int *i;
-
- eax = KVM_CPUID_SIGNATURE;
- ebx = ecx = edx = 0;
-
- asm volatile ("cpuid"
- : "+a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
- :
- : "cc", "memory");
- i = (unsigned int *)s;
- i[0] = ebx;
- i[1] = ecx;
- i[2] = edx;
-
- return !strncmp(s, "KVMKVMKVM", strlen("KVMKVMKVM"));
-}
-
-/**
- * NOTE:
- * It's actually impossible to check if we are running in KVM host,
- * since the "KVM host" is simply native. So we only dectect guest here.
- */
-static int kvmgt_detect_host(void)
-{
- return kvmgt_check_guest() ? -ENODEV : 0;
-}
-
static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
{
struct intel_vgpu *itr;
@@ -1453,7 +1422,6 @@ static unsigned long kvmgt_virt_to_pfn(void *addr)
}
struct intel_gvt_mpt kvmgt_mpt = {
- .detect_host = kvmgt_detect_host,
.host_init = kvmgt_host_init,
.host_exit = kvmgt_host_exit,
.attach_vgpu = kvmgt_attach_vgpu,
diff --git a/drivers/gpu/drm/i915/gvt/mpt.h b/drivers/gpu/drm/i915/gvt/mpt.h
index 1af5830c0a56..419353624c5a 100644
--- a/drivers/gpu/drm/i915/gvt/mpt.h
+++ b/drivers/gpu/drm/i915/gvt/mpt.h
@@ -44,18 +44,6 @@
*/
/**
- * intel_gvt_hypervisor_detect_host - check if GVT-g is running within
- * hypervisor host/privilged domain
- *
- * Returns:
- * Zero on success, -ENODEV if current kernel is running inside a VM
- */
-static inline int intel_gvt_hypervisor_detect_host(void)
-{
- return intel_gvt_host.mpt->detect_host();
-}
-
-/**
* intel_gvt_hypervisor_host_init - init GVT-g host side
*
* Returns:
--
2.11.0
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