On Mon, Feb 03, 2020 at 03:42:17PM +, Wei Liu wrote:
> On Mon, Feb 03, 2020 at 04:32:52PM +0100, Jan Beulich wrote:
> > On 03.02.2020 16:21, Roger Pau Monné wrote:
> > > On Mon, Feb 03, 2020 at 03:07:24PM +, Wei Liu wrote:
> > >> On Mon, Feb 03, 2020 at 04:01:54PM +0100, Roger Pau Monné
On Mon, Feb 03, 2020 at 04:32:52PM +0100, Jan Beulich wrote:
> On 03.02.2020 16:21, Roger Pau Monné wrote:
> > On Mon, Feb 03, 2020 at 03:07:24PM +, Wei Liu wrote:
> >> On Mon, Feb 03, 2020 at 04:01:54PM +0100, Roger Pau Monné wrote:
> >>> On Fri, Jan 31, 2020 at 05:49:24PM +, Wei Liu
On 03.02.2020 16:21, Roger Pau Monné wrote:
> On Mon, Feb 03, 2020 at 03:07:24PM +, Wei Liu wrote:
>> On Mon, Feb 03, 2020 at 04:01:54PM +0100, Roger Pau Monné wrote:
>>> On Fri, Jan 31, 2020 at 05:49:24PM +, Wei Liu wrote:
Hyper-V uses a technique called overlay page for its
On Mon, Feb 03, 2020 at 03:07:24PM +, Wei Liu wrote:
> On Mon, Feb 03, 2020 at 04:01:54PM +0100, Roger Pau Monné wrote:
> > On Fri, Jan 31, 2020 at 05:49:24PM +, Wei Liu wrote:
> > > Hyper-V uses a technique called overlay page for its hypercall page. It
> > > will insert a backing page to
On Mon, Feb 03, 2020 at 04:01:54PM +0100, Roger Pau Monné wrote:
> On Fri, Jan 31, 2020 at 05:49:24PM +, Wei Liu wrote:
> > Hyper-V uses a technique called overlay page for its hypercall page. It
> > will insert a backing page to the guest when the hypercall functionality
> > is enabled. That
On Fri, Jan 31, 2020 at 05:49:24PM +, Wei Liu wrote:
> Hyper-V uses a technique called overlay page for its hypercall page. It
> will insert a backing page to the guest when the hypercall functionality
> is enabled. That means we can use a page that is not backed by real
> memory for hypercall
On Mon, Feb 03, 2020 at 02:21:14PM +0100, Jan Beulich wrote:
> On 31.01.2020 18:49, Wei Liu wrote:
> > +static void __init setup_hypercall_page(void)
> > +{
> > +union hv_x64_msr_hypercall_contents hypercall_msr;
> > +union hv_guest_os_id guest_id;
> > +unsigned long mfn;
> > +
> > +
On 31.01.2020 18:49, Wei Liu wrote:
> +static void __init setup_hypercall_page(void)
> +{
> +union hv_x64_msr_hypercall_contents hypercall_msr;
> +union hv_guest_os_id guest_id;
> +unsigned long mfn;
> +
> +BUILD_BUG_ON(HV_HYP_PAGE_SHIFT != PAGE_SHIFT);
> +
> +
On Mon, Feb 03, 2020 at 11:41:57AM +, Durrant, Paul wrote:
> > -Original Message-
> > From: Jan Beulich
> > Sent: 03 February 2020 11:39
> > To: Durrant, Paul
> > Cc: Wei Liu ; Xen Development List > de...@lists.xenproject.org>; Michael Kelley ; Wei
> > Liu ; Andrew Cooper ;
> >
> -Original Message-
> From: Jan Beulich
> Sent: 03 February 2020 11:39
> To: Durrant, Paul
> Cc: Wei Liu ; Xen Development List de...@lists.xenproject.org>; Michael Kelley ; Wei
> Liu ; Andrew Cooper ;
> Roger Pau Monné
> Subject: Re: [PATCH v6 05/11] x86/hyperv: setup hypercall page
On 03.02.2020 12:37, Durrant, Paul wrote:
>> -Original Message-
>> From: Jan Beulich
>> Sent: 03 February 2020 11:34
>> To: Durrant, Paul
>> Cc: Wei Liu ; Xen Development List > de...@lists.xenproject.org>; Michael Kelley ; Wei
>> Liu ; Andrew Cooper ;
>> Roger Pau Monné
>> Subject: Re:
> -Original Message-
> From: Jan Beulich
> Sent: 03 February 2020 11:34
> To: Durrant, Paul
> Cc: Wei Liu ; Xen Development List de...@lists.xenproject.org>; Michael Kelley ; Wei
> Liu ; Andrew Cooper ;
> Roger Pau Monné
> Subject: Re: [PATCH v6 05/11] x86/hyperv: setup hypercall page
On 03.02.2020 12:21, Durrant, Paul wrote:
>> -Original Message-
>> From: Jan Beulich
>> Sent: 03 February 2020 11:06
>> To: Durrant, Paul
>> Cc: Wei Liu ; Xen Development List > de...@lists.xenproject.org>; Michael Kelley ; Wei
>> Liu ; Andrew Cooper ;
>> Roger Pau Monné
>> Subject: Re:
> -Original Message-
> From: Jan Beulich
> Sent: 03 February 2020 11:06
> To: Durrant, Paul
> Cc: Wei Liu ; Xen Development List de...@lists.xenproject.org>; Michael Kelley ; Wei
> Liu ; Andrew Cooper ;
> Roger Pau Monné
> Subject: Re: [PATCH v6 05/11] x86/hyperv: setup hypercall page
On 03.02.2020 11:39, Durrant, Paul wrote:
>> -Original Message-
>> From: Wei Liu
>> Sent: 31 January 2020 17:57
>> To: Xen Development List
>> Cc: Durrant, Paul ; Michael Kelley
>> ; Wei Liu ; Wei Liu
>> ; Jan Beulich ; Andrew Cooper
>> ; Roger Pau Monné
>> Subject: Re: [PATCH v6 05/11]
> -Original Message-
> From: Wei Liu
> Sent: 31 January 2020 17:57
> To: Xen Development List
> Cc: Durrant, Paul ; Michael Kelley
> ; Wei Liu ; Wei Liu
> ; Jan Beulich ; Andrew Cooper
> ; Roger Pau Monné
> Subject: Re: [PATCH v6 05/11] x86/hyperv: setup hypercall page
>
> (Note to
(Note to self)
On Fri, Jan 31, 2020 at 05:49:24PM +, Wei Liu wrote:
[...]
> +static uint64_t generate_guest_id(void)
> +{
> +union hv_guest_os_id id;
> +
id.raw = 0;
> +id.vendor = HV_XEN_VENDOR_ID;
> +id.major = xen_major_version();
> +id.minor = xen_minor_version();
Hyper-V uses a technique called overlay page for its hypercall page. It
will insert a backing page to the guest when the hypercall functionality
is enabled. That means we can use a page that is not backed by real
memory for hypercall page.
Use the top-most addressable page for that purpose.
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