[xen master] x86/platform: introduce hypercall to get initial video console settings

[patchbot@xxxxxxx]

commit 4dd160583c798d3a5a451ea74633836891d15354
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Tue Dec 6 13:53:43 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Dec 6 13:53:43 2022 +0100

    x86/platform: introduce hypercall to get initial video console settings
    
    This is required so PVH dom0 can get the initial video console state
    as handled by Xen.  PV dom0 will get this as part of the start_info,
    but it doesn't seem necessary to place such information in the
    HVM start info.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/platform_hypercall.c | 11 +++++++++++
 xen/drivers/video/vga.c           |  2 +-
 xen/include/public/platform.h     |  6 ++++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/platform_hypercall.c 
b/xen/arch/x86/platform_hypercall.c
index a7341dc3d7..3f0d0389af 100644
--- a/xen/arch/x86/platform_hypercall.c
+++ b/xen/arch/x86/platform_hypercall.c
@@ -839,6 +839,17 @@ ret_t do_platform_op(
     }
     break;
 
+    case XENPF_get_dom0_console:
+        if ( !fill_console_start_info(&op->u.dom0_console) )
+        {
+            ret = -ENODEV;
+            break;
+        }
+
+        if ( copy_field_to_guest(u_xenpf_op, op, u.dom0_console) )
+            ret = -EFAULT;
+        break;
+
     default:
         ret = -ENOSYS;
         break;
diff --git a/xen/drivers/video/vga.c b/xen/drivers/video/vga.c
index 29a88e8241..0a03508bee 100644
--- a/xen/drivers/video/vga.c
+++ b/xen/drivers/video/vga.c
@@ -205,7 +205,7 @@ static void cf_check vga_text_puts(const char *s, size_t nr)
     }
 }
 
-int __init fill_console_start_info(struct dom0_vga_console_info *ci)
+int fill_console_start_info(struct dom0_vga_console_info *ci)
 {
     memcpy(ci, &vga_console_info, sizeof(*ci));
     return 1;
diff --git a/xen/include/public/platform.h b/xen/include/public/platform.h
index 5e1494fe9a..14784dfa77 100644
--- a/xen/include/public/platform.h
+++ b/xen/include/public/platform.h
@@ -605,6 +605,11 @@ struct xenpf_symdata {
 typedef struct xenpf_symdata xenpf_symdata_t;
 DEFINE_XEN_GUEST_HANDLE(xenpf_symdata_t);
 
+/* Fetch the video console information and mode setup by Xen. */
+#define XENPF_get_dom0_console 64
+typedef struct dom0_vga_console_info xenpf_dom0_console_t;
+DEFINE_XEN_GUEST_HANDLE(xenpf_dom0_console_t);
+
 /*
  * ` enum neg_errnoval
  * ` HYPERVISOR_platform_op(const struct xen_platform_op*);
@@ -635,6 +640,7 @@ struct xen_platform_op {
         xenpf_core_parking_t          core_parking;
         xenpf_resource_op_t           resource_op;
         xenpf_symdata_t               symdata;
+        xenpf_dom0_console_t          dom0_console;
         uint8_t                       pad[128];
     } u;
 };
--
generated by git-patchbot for /home/xen/git/xen.git#master