Message ID | 1514169855-13314-1-git-send-email-changbin.du@intel.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
diff --git a/drivers/gpu/drm/i915/i915_memcpy.c b/drivers/gpu/drm/i915/i915_memcpy.c index 49a0794..79f8ec7 100644 --- a/drivers/gpu/drm/i915/i915_memcpy.c +++ b/drivers/gpu/drm/i915/i915_memcpy.c @@ -96,6 +96,11 @@ bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len) void i915_memcpy_init_early(struct drm_i915_private *dev_priv) { - if (static_cpu_has(X86_FEATURE_XMM4_1)) + /* + * Some hypervisors (e.g. KVM) don't support VEX-prefix instructions + * emulation. So don't enable movntdqa in hypervisor guest. + */ + if (static_cpu_has(X86_FEATURE_XMM4_1) && + !boot_cpu_has(X86_FEATURE_HYPERVISOR)) static_branch_enable(&has_movntdqa); }