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drm/i915/gvt: remove detect_host() MPT hook

Browse source 
We only depend on pvinfo register for GVT-g state detection,
not require hypervisor host detect any more.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Zhenyu Wang 2016-12-27 14:47:04 +08:00
parent d2896e34eb
commit 3de49a7314
4 changed files with 0 additions and 52 deletions
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7
drivers/gpu/drm/i915/gvt/gvt.c
View file

@ -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;
@ -103,11 +101,6 @@ 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]);

1
drivers/gpu/drm/i915/gvt/hypercall.h
View file

@ -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);

32
drivers/gpu/drm/i915/gvt/kvmgt.c
View file

@ -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,

12
drivers/gpu/drm/i915/gvt/mpt.h
View file

@ -43,18 +43,6 @@
* hypervisor.
*/
/**
* 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
*