Recommend QEMU 6.2.0_1 on M1 macOS

AkihiroSuda · AkihiroSuda · commit a37a4bf0ac8a · 2022-03-14T16:52:07.000+09:00
Homebrew's QEMU 6.2.0_1 contains the following commits to run recent Linux guests: - qemu/qemu@ad99f64f `hvf: arm: Use macros for sysreg shift/masking` - qemu/qemu@7f6c295c `hvf: arm: Handle unknown ID registers as RES0` These commits are planned to be included in the upstream QEMU 7.0.0 (ETA: April 2022). See Homebrew/homebrew-core PR 96743 for the further information. Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
diff --git a/README.md b/README.md
@@ -110,7 +110,16 @@ brew install lima
 
 #### Install QEMU
 
-Install recent version of QEMU. v6.2.0 or later is recommended.
+Install recent version of QEMU.
+
+On M1 macOS, [Homebrew's QEMU `6.2.0_1`](https://github.com/Homebrew/homebrew-core/pull/96743) or later is recommended.
+
+If you are not using Homebrew, make sure to include the following commits to boot recent Linux guests:
+- https://github.com/qemu/qemu/commit/ad99f64f `hvf: arm: Use macros for sysreg shift/masking`
+- https://github.com/qemu/qemu/commit/7f6c295c `hvf: arm: Handle unknown ID registers as RES0`
+
+These commits are planned to be included in the upstream QEMU 7.0.0 (ETA: April 2022).
+See https://github.com/Homebrew/homebrew-core/pull/96743 for the further information.
 
 #### Install Lima
 
@@ -402,8 +411,12 @@ On Linux hosts, you might have to set sysctl value `net.ipv4.ip_unprivileged_por
 
 #### stuck on "Waiting for the essential requirement 1 of X: "ssh"
 
-libslirp v4.6.0 used by QEMU is known to be [broken](https://gitlab.freedesktop.org/slirp/libslirp/-/issues/48).
-If you have libslirp v4.6.0 in `/usr/local/Cellar/libslirp`, you have to upgrade it to v4.6.1 or later (`brew upgrade`).
+On M1 macOS, QEMU needs to be [Homebrew's QEMU `6.2.0_1`](https://github.com/Homebrew/homebrew-core/pull/96743) or later to run recent Linux guests.
+Run `brew upgrade` to upgrade QEMU.
+
+If you are not using Homebrew, see the "Manual installation steps" in the [Installation](#installation) section.
+
+See also `serial.log` in `~/.lima/<INSTANCE>` for debugging.
 
 #### "permission denied" for `limactl cp` command
 
diff --git a/examples/buildkit.yaml b/examples/buildkit.yaml
@@ -12,7 +12,6 @@ message: |
  -------
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220309 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/21.10/release-20220201/ubuntu-21.10-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:73fe1785c60edeb506f191affff0440abcc2de02420bb70865d51d0ff9b28223"
diff --git a/examples/default.yaml b/examples/default.yaml
@@ -14,7 +14,6 @@ arch: null
 # 🔵 This file: Ubuntu 21.10 Impish Indri images
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220309 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/21.10/release-20220201/ubuntu-21.10-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:73fe1785c60edeb506f191affff0440abcc2de02420bb70865d51d0ff9b28223"
diff --git a/examples/docker.yaml b/examples/docker.yaml
@@ -9,7 +9,6 @@
 # This example requires Lima v0.8.0 or later
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220309 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/21.10/release-20220201/ubuntu-21.10-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:73fe1785c60edeb506f191affff0440abcc2de02420bb70865d51d0ff9b28223"
diff --git a/examples/faasd.yaml b/examples/faasd.yaml
@@ -20,7 +20,6 @@
 # Image is set to focal (20.04 LTS) for long-term stability
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220308 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/20.04/release-20220302/ubuntu-20.04-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:243157ea0390890d6e60ce5e08e0249b16e23b6b313b63aed50f39f92b020afe"
diff --git a/examples/k3s.yaml b/examples/k3s.yaml
@@ -15,7 +15,6 @@
 
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220309 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/21.10/release-20220201/ubuntu-21.10-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:73fe1785c60edeb506f191affff0440abcc2de02420bb70865d51d0ff9b28223"
diff --git a/examples/k8s.yaml b/examples/k8s.yaml
@@ -16,7 +16,6 @@
 # Image is set to focal (20.04 LTS) for long-term stability
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220308 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/20.04/release-20220302/ubuntu-20.04-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:243157ea0390890d6e60ce5e08e0249b16e23b6b313b63aed50f39f92b020afe"
diff --git a/examples/nomad.yaml b/examples/nomad.yaml
@@ -12,7 +12,6 @@
 # Image is set to focal (20.04 LTS) for long-term stability
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220308 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/20.04/release-20220302/ubuntu-20.04-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:243157ea0390890d6e60ce5e08e0249b16e23b6b313b63aed50f39f92b020afe"
diff --git a/examples/podman.yaml b/examples/podman.yaml
@@ -13,7 +13,6 @@
 # This example requires Lima v0.8.0 or later
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220309 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/21.10/release-20220201/ubuntu-21.10-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:73fe1785c60edeb506f191affff0440abcc2de02420bb70865d51d0ff9b28223"
diff --git a/examples/ubuntu-lts.yaml b/examples/ubuntu-lts.yaml
@@ -3,7 +3,6 @@
 # This example requires Lima v0.7.0 or later.
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220308 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/20.04/release-20220302/ubuntu-20.04-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:243157ea0390890d6e60ce5e08e0249b16e23b6b313b63aed50f39f92b020afe"
diff --git a/examples/ubuntu.yaml b/examples/ubuntu.yaml
@@ -1,7 +1,6 @@
 # This example requires Lima v0.7.0 or later.
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-# ⚠️ release-20220309 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/21.10/release-20220201/ubuntu-21.10-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:73fe1785c60edeb506f191affff0440abcc2de02420bb70865d51d0ff9b28223"
diff --git a/examples/vmnet.yaml b/examples/vmnet.yaml
@@ -2,7 +2,6 @@
 # This example requires Lima v0.7.0 or later.
 # Older versions of Lima were using a different syntax for supporting vmnet.framework.
 images:
-# ⚠️ release-20220309 is known to be broken on aarch64: https://github.com/lima-vm/lima/issues/712
 - location: "https://cloud-images.ubuntu.com/releases/21.10/release-20220201/ubuntu-21.10-server-cloudimg-amd64.img"
   arch: "x86_64"
   digest: "sha256:73fe1785c60edeb506f191affff0440abcc2de02420bb70865d51d0ff9b28223"
diff --git a/pkg/qemu/qemu.go b/pkg/qemu/qemu.go
@@ -201,6 +201,47 @@ func inspectFeatures(exe string) (*features, error) {
 	return &f, nil
 }
 
+// showDarwinARM64HVFQEMU620Warning shows a warning on M1 macOS when QEMU is older than 6.2.0_1.
+//
+// See:
+// - https://gitlab.com/qemu-project/qemu/-/issues/899
+// - https://github.com/Homebrew/homebrew-core/pull/96743
+// - https://github.com/lima-vm/lima/issues/712
+func showDarwinARM64HVFQEMU620Warning(exe, accel string, features *features) {
+	if runtime.GOOS != "darwin" {
+		return
+	}
+	if runtime.GOARCH != "arm64" {
+		return
+	}
+	if accel != "hvf" {
+		return
+	}
+	if strings.Contains(string(features.MachineHelp), "virt-7.0") {
+		// QEMU 7.0.0 or later
+		return
+	}
+	if exeFull, err := exec.LookPath(exe); err == nil {
+		if exeResolved, err2 := filepath.EvalSymlinks(exeFull); err2 == nil {
+			if strings.Contains(exeResolved, "Cellar/qemu/6.2.0_") {
+				// Homebrew's QEMU 6.2.0_1 or later
+				return
+			}
+		}
+	}
+	w := "This version of QEMU might not be able to boot recent Linux guests on M1 macOS hosts."
+	if _, err := exec.LookPath("brew"); err == nil {
+		w += "Run `brew upgrade` and make sure your QEMU version is 6.2.0_1 or later."
+	} else {
+		w += `Reinstall QEMU with the following commits (included in QEMU 7.0.0):
+- https://github.com/qemu/qemu/commit/ad99f64f "hvf: arm: Use macros for sysreg shift/masking"
+- https://github.com/qemu/qemu/commit/7f6c295c "hvf: arm: Handle unknown ID registers as RES0"
+`
+		w += "See https://github.com/Homebrew/homebrew-core/pull/96743 for the further information."
+	}
+	logrus.Warn(w)
+}
+
 func Cmdline(cfg Config) (string, []string, error) {
 	y := cfg.LimaYAML
 	exe, args, err := getExe(*y.Arch)
@@ -218,6 +259,7 @@ func Cmdline(cfg Config) (string, []string, error) {
 	if !strings.Contains(string(features.AccelHelp), accel) {
 		return "", nil, fmt.Errorf("accelerator %q is not supported by %s", accel, exe)
 	}
+	showDarwinARM64HVFQEMU620Warning(exe, accel, features)
 
 	cpu := y.CPUType[*y.Arch]
 	args = appendArgsIfNoConflict(args, "-cpu", cpu)
diff --git a/pkg/start/start.go b/pkg/start/start.go
@@ -9,8 +9,6 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
-	"runtime"
-	"strings"
 	"text/template"
 	"time"
 
@@ -150,8 +148,6 @@ func Start(ctx context.Context, inst *store.Instance) error {
 		return err
 	}
 
-	showUbuntuMarch2022Warning(inst) // remove when Ubuntu fixes https://github.com/lima-vm/lima/issues/712
-
 	watchErrCh := make(chan error)
 	go func() {
 		watchErrCh <- watchHostAgentEvents(ctx, inst, haStdoutPath, haStderrPath, begin)
@@ -275,60 +271,3 @@ func ShowMessage(inst *store.Instance) error {
 	}
 	return nil
 }
-
-// showUbuntuMarch2022Warning shows warning for https://github.com/lima-vm/lima/issues/712
-func showUbuntuMarch2022Warning(inst *store.Instance) {
-	if runtime.GOARCH != "arm64" {
-		return
-	}
-	if unlikelyUbuntu(inst.Name) {
-		return
-	}
-	display := "sdl"
-	if runtime.GOOS == "darwin" {
-		display = "cocoa"
-	}
-	s := fmt.Sprintf(`
-============ ⚠️  March 2022 update of Ubuntu does not work on ARM ⚠️  ============
-Ubuntu kernel 5.13.0-35.40 (5.4.0-103.117 for 20.04 LTS) released in March 2022
-is not bootable on ARM hosts.
-(EFI stub: ERROR: FIRMWARE BUG: kernel image not aligned on 64k boundary
-
-Until the issue gets resolved, it is HIGHLY RECOMMENDED to run the following
-command in the Ubuntu shell (NOT the host shell) to avoid upgrading the kernel:
-
-------------------------------------------------------------
-sudo apt-mark hold linux-image-$(uname -r)
-------------------------------------------------------------
-
-If your kernel was already upgraded and the VM does not boot, try running Lima
-with the following environment variable to show the QEMU video display:
-
-------------------------------------------------------------
-export QEMU_SYSTEM_AARCH64="qemu-system-aarch64 -display %s"
-------------------------------------------------------------
-
-After the display is shown, press the Esc key several times to show the GRUB
-prompt for choosing an older kernel.
-
-To receive updates about this issue, subscribe to the following issue tickets:
-- https://github.com/lima-vm/lima/issues/712
-- https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1947046
-
-If you are not using Ubuntu, you can ignore this warning message.
-============ ⚠️  March 2022 update of Ubuntu does not work on ARM ⚠️  ============
-`, display)
-	logrus.Warn(s)
-}
-
-func unlikelyUbuntu(instName string) bool {
-	dict := []string{
-		"alma", "alpine", "archlinux", "centos", "debian", "fedora", "red", "rhel", "suse", "oracle", "rocky",
-	}
-	for _, f := range dict {
-		if strings.Contains(instName, f) {
-			return true
-		}
-	}
-	return false
-}
