Commit 3de49a73 authored by Zhenyu Wang's avatar Zhenyu Wang
Browse files

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



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

Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent d2896e34

drivers/gpu/drm/i915/gvt/gvt.c

+0 −7
Original line number Diff line number Diff line
@@ -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]);

drivers/gpu/drm/i915/gvt/hypercall.h

+0 −1
Original line number Diff line number Diff line
@@ -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);

drivers/gpu/drm/i915/gvt/kvmgt.c

+0 −32
Original line number Diff line number Diff line
@@ -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,

drivers/gpu/drm/i915/gvt/mpt.h

+0 −12
Original line number Diff line number Diff line
@@ -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

 *