[tip: x86/platform] x86/jailhouse: Enable platform UARTs only if available - tip-bot2 for Ralf Ramsauer

From: "tip-bot2 for Ralf Ramsauer" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Ralf Ramsauer <ralf.ramsauer@oth-regensburg.de>,
	Jan Kiszka <jan.kiszka@siemens.com>,
	Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	jailhouse-dev@googlegroups.com, Ingo Molnar <mingo@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: [tip: x86/platform] x86/jailhouse: Enable platform UARTs only if available
Date: Mon, 07 Oct 2019 18:25:04 -0000	[thread overview]
Message-ID: <157047270440.9978.1646295335019419258.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20191007123819.161432-3-ralf.ramsauer@oth-regensburg.de>

The following commit has been merged into the x86/platform branch of tip:

Commit-ID:     dac59f1eb78123c3f0e497eb9870ac550c59debb
Gitweb:        https://git.kernel.org/tip/dac59f1eb78123c3f0e497eb9870ac550c59debb
Author:        Ralf Ramsauer <ralf.ramsauer@oth-regensburg.de>
AuthorDate:    Mon, 07 Oct 2019 14:38:19 +02:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Mon, 07 Oct 2019 17:35:56 +02:00

x86/jailhouse: Enable platform UARTs only if available

ACPI tables aren't available if Linux runs as guest of the hypervisor
Jailhouse. This makes the 8250 driver probe for all platform UARTs as
it assumes that all platform are present in case of !ACPI. Jailhouse
will stop execution of Linux guest due to port access violation.

So far, these access violations could be solved by tuning the
8250.nr_uarts parameter but it has limitations: We can, e.g., only map
consecutive platform UARTs to Linux, and only in the sequence 0x3f8,
0x2f8, 0x3e8, 0x2e8.

Beginning from setup_data version 2, Jailhouse will place information of
available platform UARTs in setup_data. This allows for selective
activation of platform UARTs.

This patch queries the setup_data version and activates only available
UARTS. It comes with backward compatibility, and will still support
older setup_data versions. In this case, Linux falls back to the old
behaviour.

Signed-off-by: Ralf Ramsauer <ralf.ramsauer@oth-regensburg.de>
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H . Peter Anvin <hpa@zytor.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: jailhouse-dev@googlegroups.com
Link: https://lkml.kernel.org/r/20191007123819.161432-3-ralf.ramsauer@oth-regensburg.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/include/uapi/asm/bootparam.h |  3 +-
 arch/x86/kernel/jailhouse.c           | 83 ++++++++++++++++++++++----
 2 files changed, 74 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index 43be437..db1e24e 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -152,6 +152,9 @@ struct jailhouse_setup_data {
 		__u8	standard_ioapic;
 		__u8	cpu_ids[255];
 	} __attribute__((packed)) v1;
+	struct {
+		__u32	flags;
+	} __attribute__((packed)) v2;
 } __attribute__((packed));
 
 /* The so-called "zeropage" */
diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index b9647ad..95550c0 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -11,6 +11,7 @@
 #include <linux/acpi_pmtmr.h>
 #include <linux/kernel.h>
 #include <linux/reboot.h>
+#include <linux/serial_8250.h>
 #include <asm/apic.h>
 #include <asm/cpu.h>
 #include <asm/hypervisor.h>
@@ -23,9 +24,22 @@
 
 static __initdata struct jailhouse_setup_data setup_data;
 #define SETUP_DATA_V1_LEN	(sizeof(setup_data.hdr) + sizeof(setup_data.v1))
+#define SETUP_DATA_V2_LEN	(SETUP_DATA_V1_LEN + sizeof(setup_data.v2))
 
 static unsigned int precalibrated_tsc_khz;
 
+static void jailhouse_setup_irq(unsigned int irq)
+{
+	struct mpc_intsrc mp_irq = {
+		.type		= MP_INTSRC,
+		.irqtype	= mp_INT,
+		.irqflag	= MP_IRQPOL_ACTIVE_HIGH | MP_IRQTRIG_EDGE,
+		.srcbusirq	= irq,
+		.dstirq		= irq,
+	};
+	mp_save_irq(&mp_irq);
+}
+
 static uint32_t jailhouse_cpuid_base(void)
 {
 	if (boot_cpu_data.cpuid_level < 0 ||
@@ -79,11 +93,6 @@ static void __init jailhouse_get_smp_config(unsigned int early)
 		.type = IOAPIC_DOMAIN_STRICT,
 		.ops = &mp_ioapic_irqdomain_ops,
 	};
-	struct mpc_intsrc mp_irq = {
-		.type = MP_INTSRC,
-		.irqtype = mp_INT,
-		.irqflag = MP_IRQPOL_ACTIVE_HIGH | MP_IRQTRIG_EDGE,
-	};
 	unsigned int cpu;
 
 	jailhouse_x2apic_init();
@@ -100,12 +109,12 @@ static void __init jailhouse_get_smp_config(unsigned int early)
 	if (setup_data.v1.standard_ioapic) {
 		mp_register_ioapic(0, 0xfec00000, gsi_top, &ioapic_cfg);
 
-		/* Register 1:1 mapping for legacy UART IRQs 3 and 4 */
-		mp_irq.srcbusirq = mp_irq.dstirq = 3;
-		mp_save_irq(&mp_irq);
-
-		mp_irq.srcbusirq = mp_irq.dstirq = 4;
-		mp_save_irq(&mp_irq);
+		if (IS_ENABLED(CONFIG_SERIAL_8250) &&
+		    setup_data.hdr.version < 2) {
+			/* Register 1:1 mapping for legacy UART IRQs 3 and 4 */
+			jailhouse_setup_irq(3);
+			jailhouse_setup_irq(4);
+		}
 	}
 }
 
@@ -138,6 +147,53 @@ static int __init jailhouse_pci_arch_init(void)
 	return 0;
 }
 
+#ifdef CONFIG_SERIAL_8250
+static bool jailhouse_uart_enabled(unsigned int uart_nr)
+{
+	return setup_data.v2.flags & BIT(uart_nr);
+}
+
+static void jailhouse_serial_fixup(int port, struct uart_port *up,
+				   u32 *capabilities)
+{
+	static const u16 pcuart_base[] = {0x3f8, 0x2f8, 0x3e8, 0x2e8};
+	unsigned int n;
+
+	for (n = 0; n < ARRAY_SIZE(pcuart_base); n++) {
+		if (pcuart_base[n] != up->iobase)
+			continue;
+
+		if (jailhouse_uart_enabled(n)) {
+			pr_info("Enabling UART%u (port 0x%lx)\n", n,
+				up->iobase);
+			jailhouse_setup_irq(up->irq);
+		} else {
+			/* Deactivate UART if access isn't allowed */
+			up->iobase = 0;
+		}
+		break;
+	}
+}
+
+static void jailhouse_serial_workaround(void)
+{
+	/*
+	 * There are flags inside setup_data that indicate availability of
+	 * platform UARTs since setup data version 2.
+	 *
+	 * In case of version 1, we don't know which UARTs belong Linux. In
+	 * this case, unconditionally register 1:1 mapping for legacy UART IRQs
+	 * 3 and 4.
+	 */
+	if (setup_data.hdr.version > 1)
+		serial8250_set_isa_configurator(jailhouse_serial_fixup);
+}
+#else /* !CONFIG_SERIAL_8250 */
+static inline void jailhouse_serial_workaround(void)
+{
+}
+#endif /* CONFIG_SERIAL_8250 */
+
 static void __init jailhouse_init_platform(void)
 {
 	u64 pa_data = boot_params.hdr.setup_data;
@@ -188,7 +244,8 @@ static void __init jailhouse_init_platform(void)
 	if (setup_data.hdr.version == 0 ||
 	    setup_data.hdr.compatible_version !=
 		JAILHOUSE_SETUP_REQUIRED_VERSION ||
-	    (setup_data.hdr.version >= 1 && header.len < SETUP_DATA_V1_LEN))
+	    (setup_data.hdr.version == 1 && header.len < SETUP_DATA_V1_LEN) ||
+	    (setup_data.hdr.version >= 2 && header.len < SETUP_DATA_V2_LEN))
 		goto unsupported;
 
 	pmtmr_ioport = setup_data.v1.pm_timer_address;
@@ -204,6 +261,8 @@ static void __init jailhouse_init_platform(void)
 	 * are none in a non-root cell.
 	 */
 	disable_acpi();
+
+	jailhouse_serial_workaround();
 	return;
 
 unsupported:
