Re: [Xen-devel] [PATCH v2 6/8] x86/hyperv: provide percpu hypercall input page

From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Wei Liu <wl@xen.org>,
	Xen Development List <xen-devel@lists.xenproject.org>
Cc: "Michael Kelley" <mikelley@microsoft.com>,
	"Wei Liu" <liuwe@microsoft.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>,
	"Jan Beulich" <jbeulich@suse.com>, "Paul Durrant" <paul@xen.org>
Subject: Re: [Xen-devel] [PATCH v2 6/8] x86/hyperv: provide percpu hypercall input page
Date: Fri, 3 Jan 2020 16:30:49 +0000	[thread overview]
Message-ID: <ec797a21-8b06-6eb1-84a8-7e059c430e7a@citrix.com> (raw)
In-Reply-To: <20200103160825.19377-7-liuwe@microsoft.com>

On 03/01/2020 16:08, Wei Liu wrote:
> @@ -83,14 +84,39 @@ static void __init setup_hypercall_page(void)
>      wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
>  }
>  
> +static void setup_hypercall_pcpu_arg(void)
> +{
> +    struct page_info *pg;
> +    void *mapping;
> +    unsigned int cpu = smp_processor_id();
> +
> +    pg = alloc_domheap_page(NULL, 0);
> +    if ( !pg )
> +        panic("Failed to setup hypercall input page for %u\n", cpu);
> +
> +    mapping = __map_domain_page_global(pg);
> +    if ( !mapping )
> +        panic("Failed to map hypercall input page for %u\n", cpu);

Sorry I didn't spot this before, but an always-mapped domheap page is
just alloc_xenheap_page() (give or take NUMA positioning above the 5T
boundary, which isn't used here).

~Andrew

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