linux-kernel - [PATCH 10/10] x86: jailhouse: Initialize PCI support

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Date:   Thu, 16 Nov 2017 08:26:52 +0100
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jailhouse-dev@...glegroups.com
Subject: [PATCH 10/10] x86: jailhouse: Initialize PCI support

From: Jan Kiszka <jan.kiszka@...mens.com>

With this change, PCI devices can be detected and used inside a non-root
cell.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 arch/x86/kernel/jailhouse.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index 05459ea0ecc7..e573ea8b0a5f 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -18,6 +18,7 @@
 #include <asm/hypervisor.h>
 #include <asm/i8259.h>
 #include <asm/irqdomain.h>
+#include <asm/pci_x86.h>
 #include <asm/reboot.h>
 #include <asm/setup.h>
 
@@ -211,6 +212,15 @@ static void __init jailhouse_init_platform(void)
 
 	early_memunmap(data, sizeof(*data));
 
+	pci_probe = 0;
+	pci_direct_init(1);
+
+	/*
+	 * There are no bridges on the virtual PCI root bus under Jailhouse,
+	 * thus no other way to discover all devices than a full scan.
+	 */
+	pcibios_last_bus = 0xff;
+
 	/*
 	 * Avoid that the kernel complains about missing ACPI tables - there
 	 * are none in a non-root cell.
-- 
2.12.3