Move ring0 package.

This allows the package to serve as a general purpose ring0 support package, as
opposed to being bound to specific sentry platforms.

Updates #5039

PiperOrigin-RevId: 355220044

61 files changed, 43 insertions, 45 deletions

diff --git a/nogo.yaml b/nogo.yaml
index f17e54b8d..fa744a114 100644
--- a/nogo.yaml
+++ b/nogo.yaml
@@ -126,10 +126,10 @@ analyzers:
         - ".*_test.go"                                             # Exclude tests.
         - "pkg/flipcall/.*_unsafe.go"                              # Special case.
         - pkg/gohacks/gohacks_unsafe.go                            # Special case.
+        - pkg/ring0/pagetables/allocator_unsafe.go                 # Special case.
         - pkg/sentry/fs/fsutil/host_file_mapper_unsafe.go          # Special case.
         - pkg/sentry/platform/kvm/bluepill_unsafe.go               # Special case.
         - pkg/sentry/platform/kvm/machine_unsafe.go                # Special case.
-        - pkg/sentry/platform/ring0/pagetables/allocator_unsafe.go # Special case.
         - pkg/sentry/platform/safecopy/safecopy_unsafe.go          # Special case.
         - pkg/sentry/vfs/mount_unsafe.go                           # Special case.
         - pkg/state/decode_unsafe.go                               # Special case.
diff --git a/pkg/sentry/platform/ring0/BUILD b/pkg/ring0/BUILD
index 2852b7387..d1b14efdb 100644
--- a/pkg/sentry/platform/ring0/BUILD
+++ b/pkg/ring0/BUILD
@@ -43,16 +43,16 @@ arch_genrule(
     name = "entry_impl_amd64",
     srcs = ["entry_amd64.s"],
     outs = ["entry_impl_amd64.s"],
-    cmd = "(echo -e '// build +amd64\\n' && QEMU $(location //pkg/sentry/platform/ring0/gen_offsets) && cat $(location entry_amd64.s)) > $@",
-    tools = ["//pkg/sentry/platform/ring0/gen_offsets"],
+    cmd = "(echo -e '// build +amd64\\n' && QEMU $(location //pkg/ring0/gen_offsets) && cat $(location entry_amd64.s)) > $@",
+    tools = ["//pkg/ring0/gen_offsets"],
 )
 
 arch_genrule(
     name = "entry_impl_arm64",
     srcs = ["entry_arm64.s"],
     outs = ["entry_impl_arm64.s"],
-    cmd = "(echo -e '// build +arm64\\n' && QEMU $(location //pkg/sentry/platform/ring0/gen_offsets) && cat $(location entry_arm64.s)) > $@",
-    tools = ["//pkg/sentry/platform/ring0/gen_offsets"],
+    cmd = "(echo -e '// build +arm64\\n' && QEMU $(location //pkg/ring0/gen_offsets) && cat $(location entry_arm64.s)) > $@",
+    tools = ["//pkg/ring0/gen_offsets"],
 )
 
 go_library(
@@ -77,9 +77,9 @@ go_library(
     visibility = ["//pkg/sentry:internal"],
     deps = [
         "//pkg/cpuid",
+        "//pkg/ring0/pagetables",
         "//pkg/safecopy",
         "//pkg/sentry/arch",
-        "//pkg/sentry/platform/ring0/pagetables",
         "//pkg/usermem",
     ],
 )
diff --git a/pkg/sentry/platform/ring0/aarch64.go b/pkg/ring0/aarch64.go
index 3bda594f9..3bda594f9 100644
--- a/pkg/sentry/platform/ring0/aarch64.go
+++ b/pkg/ring0/aarch64.go
diff --git a/pkg/sentry/platform/ring0/defs.go b/pkg/ring0/defs.go
index f9765771e..e2561e4c2 100644
--- a/pkg/sentry/platform/ring0/defs.go
+++ b/pkg/ring0/defs.go
@@ -15,8 +15,8 @@
 package ring0
 
 import (
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 )
 
 // Kernel is a global kernel object.
diff --git a/pkg/sentry/platform/ring0/defs_amd64.go b/pkg/ring0/defs_amd64.go
index 7a2275558..ceddf719d 100644
--- a/pkg/sentry/platform/ring0/defs_amd64.go
+++ b/pkg/ring0/defs_amd64.go
@@ -17,7 +17,6 @@
 package ring0
 
 import (
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
 
diff --git a/pkg/sentry/platform/ring0/defs_arm64.go b/pkg/ring0/defs_arm64.go
index a014dcbc0..dcb255fc8 100644
--- a/pkg/sentry/platform/ring0/defs_arm64.go
+++ b/pkg/ring0/defs_arm64.go
@@ -17,7 +17,6 @@
 package ring0
 
 import (
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
 
diff --git a/pkg/sentry/platform/ring0/entry_amd64.go b/pkg/ring0/entry_amd64.go
index d87b1fd00..d87b1fd00 100644
--- a/pkg/sentry/platform/ring0/entry_amd64.go
+++ b/pkg/ring0/entry_amd64.go
diff --git a/pkg/sentry/platform/ring0/entry_amd64.s b/pkg/ring0/entry_amd64.s
index f59747df3..f59747df3 100644
--- a/pkg/sentry/platform/ring0/entry_amd64.s
+++ b/pkg/ring0/entry_amd64.s
diff --git a/pkg/sentry/platform/ring0/entry_arm64.go b/pkg/ring0/entry_arm64.go
index 62a93f3d6..62a93f3d6 100644
--- a/pkg/sentry/platform/ring0/entry_arm64.go
+++ b/pkg/ring0/entry_arm64.go
diff --git a/pkg/sentry/platform/ring0/entry_arm64.s b/pkg/ring0/entry_arm64.s
index b2bb18257..b2bb18257 100644
--- a/pkg/sentry/platform/ring0/entry_arm64.s
+++ b/pkg/ring0/entry_arm64.s
diff --git a/pkg/sentry/platform/ring0/gen_offsets/BUILD b/pkg/ring0/gen_offsets/BUILD
index a9703baf6..15b93d61c 100644
--- a/pkg/sentry/platform/ring0/gen_offsets/BUILD
+++ b/pkg/ring0/gen_offsets/BUILD
@@ -7,14 +7,14 @@ go_template_instance(
     name = "defs_impl_arm64",
     out = "defs_impl_arm64.go",
     package = "main",
-    template = "//pkg/sentry/platform/ring0:defs_arm64",
+    template = "//pkg/ring0:defs_arm64",
 )
 
 go_template_instance(
     name = "defs_impl_amd64",
     out = "defs_impl_amd64.go",
     package = "main",
-    template = "//pkg/sentry/platform/ring0:defs_amd64",
+    template = "//pkg/ring0:defs_amd64",
 )
 
 go_binary(
@@ -28,13 +28,13 @@ go_binary(
     # pass the sentry deps test.
     system_malloc = True,
     visibility = [
+        "//pkg/ring0:__pkg__",
         "//pkg/sentry/platform/kvm:__pkg__",
-        "//pkg/sentry/platform/ring0:__pkg__",
     ],
     deps = [
         "//pkg/cpuid",
+        "//pkg/ring0/pagetables",
         "//pkg/sentry/arch",
-        "//pkg/sentry/platform/ring0/pagetables",
         "//pkg/usermem",
     ],
 )
diff --git a/pkg/sentry/platform/ring0/gen_offsets/main.go b/pkg/ring0/gen_offsets/main.go
index a4927da2f..a4927da2f 100644
--- a/pkg/sentry/platform/ring0/gen_offsets/main.go
+++ b/pkg/ring0/gen_offsets/main.go
diff --git a/pkg/sentry/platform/ring0/kernel.go b/pkg/ring0/kernel.go
index 292f9d0cc..292f9d0cc 100644
--- a/pkg/sentry/platform/ring0/kernel.go
+++ b/pkg/ring0/kernel.go
diff --git a/pkg/sentry/platform/ring0/kernel_amd64.go b/pkg/ring0/kernel_amd64.go
index 36a60700e..36a60700e 100644
--- a/pkg/sentry/platform/ring0/kernel_amd64.go
+++ b/pkg/ring0/kernel_amd64.go
diff --git a/pkg/sentry/platform/ring0/kernel_arm64.go b/pkg/ring0/kernel_arm64.go
index c05284641..c05284641 100644
--- a/pkg/sentry/platform/ring0/kernel_arm64.go
+++ b/pkg/ring0/kernel_arm64.go
diff --git a/pkg/sentry/platform/ring0/kernel_unsafe.go b/pkg/ring0/kernel_unsafe.go
index 16955ad91..16955ad91 100644
--- a/pkg/sentry/platform/ring0/kernel_unsafe.go
+++ b/pkg/ring0/kernel_unsafe.go
diff --git a/pkg/sentry/platform/ring0/lib_amd64.go b/pkg/ring0/lib_amd64.go
index 0ec5c3bc5..0ec5c3bc5 100644
--- a/pkg/sentry/platform/ring0/lib_amd64.go
+++ b/pkg/ring0/lib_amd64.go
diff --git a/pkg/sentry/platform/ring0/lib_amd64.s b/pkg/ring0/lib_amd64.s
index 2fe83568a..2fe83568a 100644
--- a/pkg/sentry/platform/ring0/lib_amd64.s
+++ b/pkg/ring0/lib_amd64.s
diff --git a/pkg/sentry/platform/ring0/lib_arm64.go b/pkg/ring0/lib_arm64.go
index a490bf3af..a490bf3af 100644
--- a/pkg/sentry/platform/ring0/lib_arm64.go
+++ b/pkg/ring0/lib_arm64.go
diff --git a/pkg/sentry/platform/ring0/lib_arm64.s b/pkg/ring0/lib_arm64.s
index e39b32841..e39b32841 100644
--- a/pkg/sentry/platform/ring0/lib_arm64.s
+++ b/pkg/ring0/lib_arm64.s
diff --git a/pkg/sentry/platform/ring0/offsets_amd64.go b/pkg/ring0/offsets_amd64.go
index ca4075b09..ca4075b09 100644
--- a/pkg/sentry/platform/ring0/offsets_amd64.go
+++ b/pkg/ring0/offsets_amd64.go
diff --git a/pkg/sentry/platform/ring0/offsets_arm64.go b/pkg/ring0/offsets_arm64.go
index 164db6d5a..164db6d5a 100644
--- a/pkg/sentry/platform/ring0/offsets_arm64.go
+++ b/pkg/ring0/offsets_arm64.go
diff --git a/pkg/sentry/platform/ring0/pagetables/BUILD b/pkg/ring0/pagetables/BUILD
index 7ce8d0078..65a978cbb 100644
--- a/pkg/sentry/platform/ring0/pagetables/BUILD
+++ b/pkg/ring0/pagetables/BUILD
@@ -64,8 +64,8 @@ go_library(
         ":walker_unmap_arm64",
     ],
     visibility = [
+        "//pkg/ring0:__subpackages__",
         "//pkg/sentry/platform/kvm:__subpackages__",
-        "//pkg/sentry/platform/ring0:__subpackages__",
     ],
     deps = [
         "//pkg/sync",
diff --git a/pkg/sentry/platform/ring0/pagetables/allocator.go b/pkg/ring0/pagetables/allocator.go
index 8d75b7599..8d75b7599 100644
--- a/pkg/sentry/platform/ring0/pagetables/allocator.go
+++ b/pkg/ring0/pagetables/allocator.go
diff --git a/pkg/sentry/platform/ring0/pagetables/allocator_unsafe.go b/pkg/ring0/pagetables/allocator_unsafe.go
index d08bfdeb3..d08bfdeb3 100644
--- a/pkg/sentry/platform/ring0/pagetables/allocator_unsafe.go
+++ b/pkg/ring0/pagetables/allocator_unsafe.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables.go b/pkg/ring0/pagetables/pagetables.go
index 8c0a6aa82..8c0a6aa82 100644
--- a/pkg/sentry/platform/ring0/pagetables/pagetables.go
+++ b/pkg/ring0/pagetables/pagetables.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables_aarch64.go b/pkg/ring0/pagetables/pagetables_aarch64.go
index 163a3aea3..163a3aea3 100644
--- a/pkg/sentry/platform/ring0/pagetables/pagetables_aarch64.go
+++ b/pkg/ring0/pagetables/pagetables_aarch64.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables_amd64.go b/pkg/ring0/pagetables/pagetables_amd64.go
index a217f404c..a217f404c 100644
--- a/pkg/sentry/platform/ring0/pagetables/pagetables_amd64.go
+++ b/pkg/ring0/pagetables/pagetables_amd64.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables_amd64_test.go b/pkg/ring0/pagetables/pagetables_amd64_test.go
index 54e8e554f..54e8e554f 100644
--- a/pkg/sentry/platform/ring0/pagetables/pagetables_amd64_test.go
+++ b/pkg/ring0/pagetables/pagetables_amd64_test.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables_arm64.go b/pkg/ring0/pagetables/pagetables_arm64.go
index fef7a0fd1..fef7a0fd1 100644
--- a/pkg/sentry/platform/ring0/pagetables/pagetables_arm64.go
+++ b/pkg/ring0/pagetables/pagetables_arm64.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables_arm64_test.go b/pkg/ring0/pagetables/pagetables_arm64_test.go
index 2f73d424f..2f73d424f 100644
--- a/pkg/sentry/platform/ring0/pagetables/pagetables_arm64_test.go
+++ b/pkg/ring0/pagetables/pagetables_arm64_test.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables_test.go b/pkg/ring0/pagetables/pagetables_test.go
index 772f4fc5e..772f4fc5e 100644
--- a/pkg/sentry/platform/ring0/pagetables/pagetables_test.go
+++ b/pkg/ring0/pagetables/pagetables_test.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pagetables_x86.go b/pkg/ring0/pagetables/pagetables_x86.go
index 32edd2f0a..32edd2f0a 100644
--- a/pkg/sentry/platform/ring0/pagetables/pagetables_x86.go
+++ b/pkg/ring0/pagetables/pagetables_x86.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pcids.go b/pkg/ring0/pagetables/pcids.go
index 964496aac..964496aac 100644
--- a/pkg/sentry/platform/ring0/pagetables/pcids.go
+++ b/pkg/ring0/pagetables/pcids.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pcids_aarch64.go b/pkg/ring0/pagetables/pcids_aarch64.go
index fbfd41d83..fbfd41d83 100644
--- a/pkg/sentry/platform/ring0/pagetables/pcids_aarch64.go
+++ b/pkg/ring0/pagetables/pcids_aarch64.go
diff --git a/pkg/sentry/platform/ring0/pagetables/pcids_aarch64.s b/pkg/ring0/pagetables/pcids_aarch64.s
index e9d62d768..e9d62d768 100644
--- a/pkg/sentry/platform/ring0/pagetables/pcids_aarch64.s
+++ b/pkg/ring0/pagetables/pcids_aarch64.s
diff --git a/pkg/sentry/platform/ring0/pagetables/pcids_x86.go b/pkg/ring0/pagetables/pcids_x86.go
index 91fc5e8dd..91fc5e8dd 100644
--- a/pkg/sentry/platform/ring0/pagetables/pcids_x86.go
+++ b/pkg/ring0/pagetables/pcids_x86.go
diff --git a/pkg/sentry/platform/ring0/pagetables/walker_amd64.go b/pkg/ring0/pagetables/walker_amd64.go
index eb4fbcc31..eb4fbcc31 100644
--- a/pkg/sentry/platform/ring0/pagetables/walker_amd64.go
+++ b/pkg/ring0/pagetables/walker_amd64.go
diff --git a/pkg/sentry/platform/ring0/pagetables/walker_arm64.go b/pkg/ring0/pagetables/walker_arm64.go
index 5ed881c7a..5ed881c7a 100644
--- a/pkg/sentry/platform/ring0/pagetables/walker_arm64.go
+++ b/pkg/ring0/pagetables/walker_arm64.go
diff --git a/pkg/sentry/platform/ring0/pagetables/walker_generic.go b/pkg/ring0/pagetables/walker_generic.go
index 34fba7b84..34fba7b84 100644
--- a/pkg/sentry/platform/ring0/pagetables/walker_generic.go
+++ b/pkg/ring0/pagetables/walker_generic.go
diff --git a/pkg/sentry/platform/ring0/ring0.go b/pkg/ring0/ring0.go
index cdeb1b43a..cdeb1b43a 100644
--- a/pkg/sentry/platform/ring0/ring0.go
+++ b/pkg/ring0/ring0.go
diff --git a/pkg/sentry/platform/ring0/x86.go b/pkg/ring0/x86.go
index 34fbc1c35..34fbc1c35 100644
--- a/pkg/sentry/platform/ring0/x86.go
+++ b/pkg/ring0/x86.go
diff --git a/pkg/sentry/platform/kvm/BUILD b/pkg/sentry/platform/kvm/BUILD
index 8ce411102..b3290917e 100644
--- a/pkg/sentry/platform/kvm/BUILD
+++ b/pkg/sentry/platform/kvm/BUILD
@@ -45,14 +45,14 @@ go_library(
         "//pkg/cpuid",
         "//pkg/log",
         "//pkg/procid",
+        "//pkg/ring0",
+        "//pkg/ring0/pagetables",
         "//pkg/safecopy",
         "//pkg/seccomp",
         "//pkg/sentry/arch",
         "//pkg/sentry/memmap",
         "//pkg/sentry/platform",
         "//pkg/sentry/platform/interrupt",
-        "//pkg/sentry/platform/ring0",
-        "//pkg/sentry/platform/ring0/pagetables",
         "//pkg/sentry/time",
         "//pkg/sync",
         "//pkg/usermem",
@@ -75,11 +75,11 @@ go_test(
         "requires-kvm",
     ],
     deps = [
+        "//pkg/ring0",
+        "//pkg/ring0/pagetables",
         "//pkg/sentry/arch",
         "//pkg/sentry/platform",
         "//pkg/sentry/platform/kvm/testutil",
-        "//pkg/sentry/platform/ring0",
-        "//pkg/sentry/platform/ring0/pagetables",
         "//pkg/sentry/time",
         "//pkg/usermem",
     ],
@@ -89,6 +89,6 @@ genrule(
     name = "bluepill_impl_amd64",
     srcs = ["bluepill_amd64.s"],
     outs = ["bluepill_impl_amd64.s"],
-    cmd = "(echo -e '// build +amd64\\n' && $(location //pkg/sentry/platform/ring0/gen_offsets) && cat $(SRCS)) > $@",
-    tools = ["//pkg/sentry/platform/ring0/gen_offsets"],
+    cmd = "(echo -e '// build +amd64\\n' && $(location //pkg/ring0/gen_offsets) && cat $(SRCS)) > $@",
+    tools = ["//pkg/ring0/gen_offsets"],
 )
diff --git a/pkg/sentry/platform/kvm/address_space.go b/pkg/sentry/platform/kvm/address_space.go
index af5c5e191..25c21e843 100644
--- a/pkg/sentry/platform/kvm/address_space.go
+++ b/pkg/sentry/platform/kvm/address_space.go
@@ -18,9 +18,9 @@ import (
 	"sync/atomic"
 
 	"gvisor.dev/gvisor/pkg/atomicbitops"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/memmap"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
diff --git a/pkg/sentry/platform/kvm/bluepill.go b/pkg/sentry/platform/kvm/bluepill.go
index 4b23f7803..2c970162e 100644
--- a/pkg/sentry/platform/kvm/bluepill.go
+++ b/pkg/sentry/platform/kvm/bluepill.go
@@ -19,9 +19,9 @@ import (
 	"reflect"
 	"syscall"
 
+	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/safecopy"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
 )
 
 // bluepill enters guest mode.
diff --git a/pkg/sentry/platform/kvm/bluepill_allocator.go b/pkg/sentry/platform/kvm/bluepill_allocator.go
index 9485e1301..1825edc3a 100644
--- a/pkg/sentry/platform/kvm/bluepill_allocator.go
+++ b/pkg/sentry/platform/kvm/bluepill_allocator.go
@@ -17,7 +17,7 @@ package kvm
 import (
 	"fmt"
 
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 )
 
 type allocator struct {
diff --git a/pkg/sentry/platform/kvm/bluepill_amd64.go b/pkg/sentry/platform/kvm/bluepill_amd64.go
index ddc1554d5..83a4766fb 100644
--- a/pkg/sentry/platform/kvm/bluepill_amd64.go
+++ b/pkg/sentry/platform/kvm/bluepill_amd64.go
@@ -19,8 +19,8 @@ package kvm
 import (
 	"syscall"
 
+	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
 )
 
 var (
diff --git a/pkg/sentry/platform/kvm/bluepill_amd64_unsafe.go b/pkg/sentry/platform/kvm/bluepill_amd64_unsafe.go
index f8ccb7430..0063e947b 100644
--- a/pkg/sentry/platform/kvm/bluepill_amd64_unsafe.go
+++ b/pkg/sentry/platform/kvm/bluepill_amd64_unsafe.go
@@ -20,8 +20,8 @@ import (
 	"syscall"
 	"unsafe"
 
+	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
 )
 
 // dieArchSetup initializes the state for dieTrampoline.
diff --git a/pkg/sentry/platform/kvm/bluepill_arm64.go b/pkg/sentry/platform/kvm/bluepill_arm64.go
index 1f09813ba..35298135a 100644
--- a/pkg/sentry/platform/kvm/bluepill_arm64.go
+++ b/pkg/sentry/platform/kvm/bluepill_arm64.go
@@ -19,8 +19,8 @@ package kvm
 import (
 	"syscall"
 
+	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
 )
 
 var (
diff --git a/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go b/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
index 4d912769a..dbbf2a897 100644
--- a/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
+++ b/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
@@ -20,8 +20,8 @@ import (
 	"syscall"
 	"unsafe"
 
+	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
 )
 
 // fpsimdPtr returns a fpsimd64 for the given address.
diff --git a/pkg/sentry/platform/kvm/context.go b/pkg/sentry/platform/kvm/context.go
index 17268d127..aeae01dbd 100644
--- a/pkg/sentry/platform/kvm/context.go
+++ b/pkg/sentry/platform/kvm/context.go
@@ -18,10 +18,10 @@ import (
 	"sync/atomic"
 
 	pkgcontext "gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
 	"gvisor.dev/gvisor/pkg/sentry/platform/interrupt"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
 
diff --git a/pkg/sentry/platform/kvm/kvm.go b/pkg/sentry/platform/kvm/kvm.go
index 5979aef97..7bdf57436 100644
--- a/pkg/sentry/platform/kvm/kvm.go
+++ b/pkg/sentry/platform/kvm/kvm.go
@@ -20,9 +20,9 @@ import (
 	"os"
 	"syscall"
 
+	"gvisor.dev/gvisor/pkg/ring0"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
diff --git a/pkg/sentry/platform/kvm/kvm_amd64.go b/pkg/sentry/platform/kvm/kvm_amd64.go
index 093497bc4..b9ed4a706 100644
--- a/pkg/sentry/platform/kvm/kvm_amd64.go
+++ b/pkg/sentry/platform/kvm/kvm_amd64.go
@@ -18,7 +18,7 @@ package kvm
 
 import (
 	"gvisor.dev/gvisor/pkg/cpuid"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
+	"gvisor.dev/gvisor/pkg/ring0"
 )
 
 // userRegs represents KVM user registers.
diff --git a/pkg/sentry/platform/kvm/kvm_amd64_test.go b/pkg/sentry/platform/kvm/kvm_amd64_test.go
index c0b4fd374..76fc594a0 100644
--- a/pkg/sentry/platform/kvm/kvm_amd64_test.go
+++ b/pkg/sentry/platform/kvm/kvm_amd64_test.go
@@ -19,11 +19,11 @@ package kvm
 import (
 	"testing"
 
+	"gvisor.dev/gvisor/pkg/ring0"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
 	"gvisor.dev/gvisor/pkg/sentry/platform/kvm/testutil"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 )
 
 func TestSegments(t *testing.T) {
diff --git a/pkg/sentry/platform/kvm/kvm_arm64.go b/pkg/sentry/platform/kvm/kvm_arm64.go
index 9db1db4e9..b73340f0e 100644
--- a/pkg/sentry/platform/kvm/kvm_arm64.go
+++ b/pkg/sentry/platform/kvm/kvm_arm64.go
@@ -17,8 +17,8 @@
 package kvm
 
 import (
+	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
 )
 
 type kvmOneReg struct {
diff --git a/pkg/sentry/platform/kvm/kvm_test.go b/pkg/sentry/platform/kvm/kvm_test.go
index a650877d6..11ca1f0ea 100644
--- a/pkg/sentry/platform/kvm/kvm_test.go
+++ b/pkg/sentry/platform/kvm/kvm_test.go
@@ -22,11 +22,11 @@ import (
 	"testing"
 	"time"
 
+	"gvisor.dev/gvisor/pkg/ring0"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
 	"gvisor.dev/gvisor/pkg/sentry/platform/kvm/testutil"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 	ktime "gvisor.dev/gvisor/pkg/sentry/time"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
diff --git a/pkg/sentry/platform/kvm/machine.go b/pkg/sentry/platform/kvm/machine.go
index e2fffc99b..1ece1b8d8 100644
--- a/pkg/sentry/platform/kvm/machine.go
+++ b/pkg/sentry/platform/kvm/machine.go
@@ -23,8 +23,8 @@ import (
 	"gvisor.dev/gvisor/pkg/atomicbitops"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/procid"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
+	"gvisor.dev/gvisor/pkg/ring0"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	ktime "gvisor.dev/gvisor/pkg/sentry/time"
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/usermem"
diff --git a/pkg/sentry/platform/kvm/machine_amd64.go b/pkg/sentry/platform/kvm/machine_amd64.go
index 8e03c310d..59c752d73 100644
--- a/pkg/sentry/platform/kvm/machine_amd64.go
+++ b/pkg/sentry/platform/kvm/machine_amd64.go
@@ -24,10 +24,10 @@ import (
 	"syscall"
 
 	"gvisor.dev/gvisor/pkg/cpuid"
+	"gvisor.dev/gvisor/pkg/ring0"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 	ktime "gvisor.dev/gvisor/pkg/sentry/time"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
diff --git a/pkg/sentry/platform/kvm/machine_arm64.go b/pkg/sentry/platform/kvm/machine_arm64.go
index aa2d21748..7d7857067 100644
--- a/pkg/sentry/platform/kvm/machine_arm64.go
+++ b/pkg/sentry/platform/kvm/machine_arm64.go
@@ -17,10 +17,10 @@
 package kvm
 
 import (
+	"gvisor.dev/gvisor/pkg/ring0"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
 
diff --git a/pkg/sentry/platform/kvm/machine_arm64_unsafe.go b/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
index a466acf4d..dca0cdb60 100644
--- a/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
+++ b/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
@@ -23,10 +23,10 @@ import (
 	"syscall"
 	"unsafe"
 
+	"gvisor.dev/gvisor/pkg/ring0"
+	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
 
diff --git a/pkg/sentry/platform/kvm/physical_map.go b/pkg/sentry/platform/kvm/physical_map.go
index f7fa2f98d..8bdec93ae 100644
--- a/pkg/sentry/platform/kvm/physical_map.go
+++ b/pkg/sentry/platform/kvm/physical_map.go
@@ -20,7 +20,7 @@ import (
 	"syscall"
 
 	"gvisor.dev/gvisor/pkg/log"
-	"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
+	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/usermem"
 )