Use qemu external dependency (#851)

## Description

Use an external dependency for qemu rather than relying on it being
installed by the user.

- [ ] Impacts functionality?
- **Functionality** - Does the change ultimately impact how firmware
functions?
- Examples: Add a new library, publish a new PPI, update an algorithm,
...
- [ ] Impacts security?
- **Security** - Does the change have a direct security impact on an
application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
- **Breaking change** - Will anyone consuming this change experience a
break
    in build or boot behavior?
- Examples: Add a new library class, move a module to a different repo,
call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
- **Documentation** - Does the change contain explicit documentation
additions
    outside direct code modifications (and comments)?
- Examples: Update readme file, add feature readme file, link to
documentation
    on an a separate Web page, ...

## How This Was Tested

Ensured Boot to shell and Boot to windows using the Windows and Linux
qemu external dependencies. Verified TPM Replay functionality continued
to work as expected.

## Integration Instructions

N/A

.azurepipelines/Platform-Build-VS.yml

@@ -20,12 +20,6 @@ jobs:
 - template: Platform-Build-Job.yml
   parameters:
     extra_install_step:
-    - powershell: |
-        $qemuVersion = (Get-Content -Path WindowsQemuVersion.json | ConvertFrom-Json).version
-        choco install qemu --version=$qemuVersion; Write-Host "##vso[task.prependpath]c:\Program Files\qemu"
-      workingDirectory: .azurepipelines/
-      displayName: Install QEMU and Set QEMU on path # friendly name displayed in the UI
-      condition: and(gt(variables.pkg_count, 0), succeeded())
     - template: Steps/InstallCoverageTools.yml@mu_devops
     tool_chain_tag: 'VS2022'
     vm_image: $(vm_image)

Platforms/QemuQ35Pkg/Plugins/QemuRunner/QemuRunner.py

@@ -35,6 +35,8 @@ class QemuRunner(uefi_helper_plugin.IUefiHelperPlugin):
         result = io.StringIO()
         ret = utility_functions.RunCmd(exec, "--version", outstream=result)
         if ret != 0:
+            logging.error(result.getvalue())
+            logging.error(ret)
             return None
 
         # expected version string will be "QEMU emulator version maj.min.rev"
@@ -51,14 +53,22 @@ class QemuRunner(uefi_helper_plugin.IUefiHelperPlugin):
         OutputPath_FV = os.path.join(env.GetValue("BUILD_OUTPUT_BASE"), "FV")
         repo_version = env.GetValue("VERSION", "Unknown")
 
-        # Use a provided QEMU path. Default to the system path if not provided.
-        executable = env.GetValue("QEMU_PATH", "qemu-system-x86_64")
+        # Use a provided QEMU path. Otherwise use what is provided through the extdep
+        executable = env.GetValue("QEMU_PATH", None)
+        if not executable:
+            executable = str(Path(env.GetValue("QEMU_DIR", ''), "qemu-system-x86_64"))
 
         # First query the version
         qemu_version = QemuRunner.QueryQemuVersion(executable)
 
         # write messages to stdio
         args = "-debugcon stdio"
+
+        # If we are using the QEMU external dependency, we need to tell it
+        # where to look for roms
+        if not env.GetValue("QEMU_PATH") and env.GetValue("QEMU_DIR"):
+            args += f" -L {str(Path(env.GetValue('QEMU_DIR'), 'share'))}"
+
         # debug messages out thru virtual io port
         args += " -global isa-debugcon.iobase=0x402"
         # Turn off S3 support

Platforms/QemuSbsaPkg/Plugins/QemuRunner/QemuRunner.py

@@ -50,14 +50,21 @@ class QemuRunner(uefi_helper_plugin.IUefiHelperPlugin):
         OutputPath_FV = os.path.join(env.GetValue("BUILD_OUTPUT_BASE"), "FV")
         repo_version = env.GetValue("VERSION", "Unknown")
 
-        # Use a provided QEMU path. Default to the system path if not provided.
-        executable = env.GetValue("QEMU_PATH", "qemu-system-aarch64")
-
+        # Use a provided QEMU path. Otherwise use what is provided through the extdep
+        executable = env.GetValue("QEMU_PATH", None)
+        if not executable:
+            executable = str(Path(env.GetValue("QEMU_DIR", ''),"qemu-system-aarch64"))
+            
         qemu_version = QemuRunner.QueryQemuVersion(executable)
 
         # turn off network
         args = "-net none"
 
+        # If we are using the QEMU external dependency, we need to tell it
+        # where to look for roms
+        if not env.GetValue("QEMU_PATH") and env.GetValue("QEMU_DIR"):
+            args += f" -L {str(Path(env.GetValue('QEMU_DIR'), 'share'))}"
+
         # Mount disk with either startup.nsh or OS image
         path_to_os = env.GetValue("PATH_TO_OS")
         if path_to_os is not None:

QemuPkg/Binaries/qemu-linux_ext_dep.yaml

@@ -0,0 +1,19 @@
+##
+# Downloads the exact version of QEMU that is known to work for the
+# current version of mu_tiano_platforms.
+#
+# Copyright (c) 2019, Microsoft Corporation
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+{
+  "scope": "global-nix",
+  "type": "web",
+  "name": "qemu",
+  "source": "https://github.com/microsoft/mu_tiano_platforms/releases/download/v5.1.0/qemu-linux-v5.1.0.tar.gz",
+  "version": "v5.1.0",
+  "sha256": "1792d2179113beebe58743680c8b142de83b27a506acb7eff8db1cb1651c730f",
+  "internal_path": "/bin/",
+  "compression_type": "tar",
+  "flags": ["set_path", "set_build_var"],
+  "var_name": "QEMU_DIR",
+}

QemuPkg/Binaries/qemu-windows_ext_dep.yaml

@@ -0,0 +1,19 @@
+##
+# Downloads the exact version of QEMU that is known to work for the
+# current version of mu_tiano_platforms.
+#
+# Copyright (c) 2019, Microsoft Corporation
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+{
+  "scope": "global-win",
+  "type": "web",
+  "name": "qemu",
+  "source": "https://github.com/microsoft/mu_tiano_platforms/releases/download/v5.1.0/qemu-windows-v5.1.0.zip",
+  "version": "v5.1.0",
+  "sha256": "356f5ba4d110b33d0440945005f051ca4b40019162187f2929997020937ceb52",
+  "internal_path": "/bin/",
+  "compression_type": "zip",
+  "flags": ["set_path", "set_build_var"],
+  "var_name": "QEMU_DIR",
+}