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authorJan Beulich <jbeulich@suse.com>2021-09-30 14:19:16 +0200
committerJuergen Gross <jgross@suse.com>2021-10-05 08:36:12 +0200
commit4d1ab432acc9391a5ae13c629dbb5882c29fd1b0 (patch)
treeeb25eb590e4ae71514393af2acfee5b691ffad16 /arch/x86
parentxen/x86: make "earlyprintk=xen" work for HVM/PVH DomU (diff)
downloadlinux-4d1ab432acc9391a5ae13c629dbb5882c29fd1b0.tar.xz
linux-4d1ab432acc9391a5ae13c629dbb5882c29fd1b0.zip
xen/x86: generalize preferred console model from PV to PVH Dom0
Without announcing hvc0 as preferred it won't get used as long as tty0 gets registered earlier. This is particularly problematic with there not being any screen output for PVH Dom0 when the screen is in graphics mode, as the necessary information doesn't get conveyed yet from the hypervisor. Follow PV's model, but be conservative and do this for Dom0 only for now. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/582328b6-c86c-37f3-d802-5539b7a86736@suse.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/xen/enlighten.c12
-rw-r--r--arch/x86/xen/enlighten_pv.c8
-rw-r--r--arch/x86/xen/enlighten_pvh.c3
-rw-r--r--arch/x86/xen/xen-ops.h2
4 files changed, 18 insertions, 7 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 501466038075..c5b1fd606c6f 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -3,6 +3,7 @@
#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
#include <linux/memblock.h>
#endif
+#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/kexec.h>
#include <linux/slab.h>
@@ -18,6 +19,7 @@
#include <asm/xen/hypervisor.h>
#include <asm/cpu.h>
#include <asm/e820/api.h>
+#include <asm/setup.h>
#include "xen-ops.h"
#include "smp.h"
@@ -274,6 +276,16 @@ bool xen_running_on_version_or_later(unsigned int major, unsigned int minor)
return false;
}
+void __init xen_add_preferred_consoles(void)
+{
+ add_preferred_console("xenboot", 0, NULL);
+ if (!boot_params.screen_info.orig_video_isVGA)
+ add_preferred_console("tty", 0, NULL);
+ add_preferred_console("hvc", 0, NULL);
+ if (boot_params.screen_info.orig_video_isVGA)
+ add_preferred_console("tty", 0, NULL);
+}
+
void xen_reboot(int reason)
{
struct sched_shutdown r = { .reason = reason };
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index b1c0e06dcaa8..fb3095ba3bf1 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -28,7 +28,6 @@
#include <linux/mm.h>
#include <linux/page-flags.h>
#include <linux/highmem.h>
-#include <linux/console.h>
#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/edd.h>
@@ -1392,12 +1391,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
#endif
}
- add_preferred_console("xenboot", 0, NULL);
- if (!boot_params.screen_info.orig_video_isVGA)
- add_preferred_console("tty", 0, NULL);
- add_preferred_console("hvc", 0, NULL);
- if (boot_params.screen_info.orig_video_isVGA)
- add_preferred_console("tty", 0, NULL);
+ xen_add_preferred_consoles();
#ifdef CONFIG_PCI
/* PCI BIOS service won't work from a PV guest. */
diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c
index 0d5e34b9e6f9..9029c5ab60e2 100644
--- a/arch/x86/xen/enlighten_pvh.c
+++ b/arch/x86/xen/enlighten_pvh.c
@@ -36,6 +36,9 @@ void __init xen_pvh_init(struct boot_params *boot_params)
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
+ if (xen_initial_domain())
+ x86_init.oem.arch_setup = xen_add_preferred_consoles;
+
xen_efi_init(boot_params);
}
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 6d9b2b3e0c1c..524d1243a0ce 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -118,6 +118,8 @@ static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
}
#endif
+void xen_add_preferred_consoles(void);
+
void __init xen_init_apic(void);
#ifdef CONFIG_XEN_EFI