Re: [Xen-devel] [PATCH v4 10/19] xen: setup hypercall page for PVH

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Nov 02, 2018 at 01:37:29PM +0100, Juergen Gross wrote:
> Add the needed code to setup the hypercall page for calling into the
> Xen hypervisor.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Thanks, LGTM, just one suggestion and one question.

> ---
> V3: grub_xen_early_halt->grub_xen_panic (Roger Pau Monné)
>     issue panic message (Roger Pau Monné)
>     rewrite grub_xen_hypercall to avoid register variables (Daniel Kiper)
> ---
>  grub-core/kern/i386/xen/pvh.c | 69 
> +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 69 insertions(+)
> 
> diff --git a/grub-core/kern/i386/xen/pvh.c b/grub-core/kern/i386/xen/pvh.c
> index ac6181f4e..7e90a4538 100644
> --- a/grub-core/kern/i386/xen/pvh.c
> +++ b/grub-core/kern/i386/xen/pvh.c
> @@ -20,14 +20,83 @@
>  #include <grub/misc.h>
>  #include <grub/memory.h>
>  #include <grub/mm.h>
> +#include <grub/i386/cpuid.h>
> +#include <grub/i386/io.h>
>  #include <grub/xen.h>
>  #include <grub/machine/kernel.h>
>  
> +#define XEN_CONSOLE_PORT   0xe9

This is now part of the public headers (XEN_HVM_DEBUGCONS_IOPORT) if
you wish to pick it up from there.

> +
>  grub_uint64_t grub_rsdp_addr;
>  
> +static char hypercall_page[GRUB_XEN_PAGE_SIZE]
> +  __attribute__ ((aligned (GRUB_XEN_PAGE_SIZE)));
> +
> +static grub_uint32_t xen_cpuid_base;
> +
> +static void
> +grub_xen_panic (const char *msg)
> +{
> +  const char *c;
> +
> +  for (c = msg; *c; c++)
> +    grub_outb (*c, XEN_CONSOLE_PORT);
> +
> +  asm volatile ("hlt");

Should this be "cli; hlt;", or does grub always runs with interrupt flag
clear?

Thanks, Roger.

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