diff options
author | Dave Airlie <airlied@redhat.com> | 2018-09-27 04:06:46 +0300 |
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committer | Dave Airlie <airlied@redhat.com> | 2018-09-27 04:06:46 +0300 |
commit | bf78296ab1cb215d0609ac6cff4e43e941e51265 (patch) | |
tree | a193615b327d9ee538e71ca5f13bbfb4f3db4e6b /drivers/gpu/drm/i915/gvt/kvmgt.c | |
parent | 18eb2f6e19d77900695987e3a2b775cccbe5b84e (diff) | |
parent | 6bf4ca7fbc85d80446ac01c0d1d77db4d91a6d84 (diff) | |
download | linux-bf78296ab1cb215d0609ac6cff4e43e941e51265.tar.xz |
BackMerge v4.19-rc5 into drm-next
Sean Paul requested an -rc5 backmerge from some sun4i fixes.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/kvmgt.c')
-rw-r--r-- | drivers/gpu/drm/i915/gvt/kvmgt.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index 71751be329e3..c1072143da1d 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -32,6 +32,7 @@ #include <linux/device.h> #include <linux/mm.h> #include <linux/mmu_context.h> +#include <linux/sched/mm.h> #include <linux/types.h> #include <linux/list.h> #include <linux/rbtree.h> @@ -1792,16 +1793,21 @@ static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa, info = (struct kvmgt_guest_info *)handle; kvm = info->kvm; - if (kthread) + if (kthread) { + if (!mmget_not_zero(kvm->mm)) + return -EFAULT; use_mm(kvm->mm); + } idx = srcu_read_lock(&kvm->srcu); ret = write ? kvm_write_guest(kvm, gpa, buf, len) : kvm_read_guest(kvm, gpa, buf, len); srcu_read_unlock(&kvm->srcu, idx); - if (kthread) + if (kthread) { unuse_mm(kvm->mm); + mmput(kvm->mm); + } return ret; } @@ -1827,6 +1833,8 @@ static bool kvmgt_is_valid_gfn(unsigned long handle, unsigned long gfn) { struct kvmgt_guest_info *info; struct kvm *kvm; + int idx; + bool ret; if (!handle_valid(handle)) return false; @@ -1834,8 +1842,11 @@ static bool kvmgt_is_valid_gfn(unsigned long handle, unsigned long gfn) info = (struct kvmgt_guest_info *)handle; kvm = info->kvm; - return kvm_is_visible_gfn(kvm, gfn); + idx = srcu_read_lock(&kvm->srcu); + ret = kvm_is_visible_gfn(kvm, gfn); + srcu_read_unlock(&kvm->srcu, idx); + return ret; } struct intel_gvt_mpt kvmgt_mpt = { |