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SubjectRe: [PATCH 5/8] xen/pvh: Prevent PVH guests from using PIC, RTC and IOAPIC
On Fri, Oct 14, 2016 at 02:05:15PM -0400, Boris Ostrovsky wrote:
> Make sure they don't use these devices since they are not emulated
> for unprivileged PVH guest.
>
> Also don't initialize hypercall page for them in init_hvm_pv_info()
> since this has already been done.
>
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> ---
> arch/x86/xen/enlighten.c | 24 +++++++++++++++++-------
> 1 file changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index d38d568..6c1a330 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1803,10 +1803,21 @@ static void __init init_hvm_pv_info(void)
> minor = eax & 0xffff;
> printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
>
> - cpuid(base + 2, &pages, &msr, &ecx, &edx);
> + xen_domain_type = XEN_HVM_DOMAIN;
>
> - pfn = __pa(hypercall_page);
> - wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
> + /* PVH set up hypercall page earlier in xen_prepare_pvh() */
> + if (xen_pvh_domain()) {
> + pv_info.name = "Xen PVH";
> +#ifdef CONFIG_ACPI
> + /* No PIC or IOAPIC */

Shouldn't this be fetched from the MADT ACPI table if ACPI is available
(rsdp_paddr != 0 in start_info)?

Roger.

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