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Message-ID: <alpine.DEB.2.02.1210221423510.2689@kaball.uk.xensource.com>
Date: Mon, 22 Oct 2012 14:25:43 +0100
From: Stefano Stabellini <stefano.stabellini@...citrix.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
"mukesh.rathor@...cle.com" <mukesh.rathor@...cle.com>,
Ian Campbell <Ian.Campbell@...rix.com>,
Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [PATCH 5/6] xen/pvh: balloon and grant changes.
On Sat, 20 Oct 2012, Konrad Rzeszutek Wilk wrote:
> From: Mukesh Rathor <mukesh.rathor@...cle.com>
>
> For balloon changes we skip setting of local P2M as it's updated
> in Xen. For grant, the shared grant frame is the pfn and not mfn,
> hence its mapped via the same code path as HVM.
>
> Signed-off-by: Mukesh Rathor <mukesh.rathor@...cle.com>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
> drivers/xen/balloon.c | 15 +++++++++------
> drivers/xen/gntdev.c | 3 ++-
> drivers/xen/grant-table.c | 26 ++++++++++++++++++++++----
> 3 files changed, 33 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
> index 31ab82f..c825b63 100644
> --- a/drivers/xen/balloon.c
> +++ b/drivers/xen/balloon.c
> @@ -361,7 +361,9 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
> set_phys_to_machine(pfn, frame_list[i]);
>
> /* Link back into the page tables if not highmem. */
> - if (xen_pv_domain() && !PageHighMem(page)) {
> + if (xen_pv_domain() && !PageHighMem(page) &&
> + !xen_feature(XENFEAT_auto_translated_physmap)) {
> +
> int ret;
> ret = HYPERVISOR_update_va_mapping(
> (unsigned long)__va(pfn << PAGE_SHIFT),
> @@ -418,12 +420,13 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
> scrub_page(page);
>
> if (xen_pv_domain() && !PageHighMem(page)) {
> - ret = HYPERVISOR_update_va_mapping(
> - (unsigned long)__va(pfn << PAGE_SHIFT),
> - __pte_ma(0), 0);
> - BUG_ON(ret);
> + if (!xen_feature(XENFEAT_auto_translated_physmap)) {
> + ret = HYPERVISOR_update_va_mapping(
> + (unsigned long)__va(pfn << PAGE_SHIFT),
> + __pte_ma(0), 0);
> + BUG_ON(ret);
> + }
> }
this change, unlike the one before, actually makes things different for
traditional pv domains in case PageHighMem(page).
The rest looks good.
> }
>
> /* Ensure that ballooned highmem pages don't have kmaps. */
> diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
> index 610bfc6..d39d54e 100644
> --- a/drivers/xen/gntdev.c
> +++ b/drivers/xen/gntdev.c
> @@ -803,7 +803,8 @@ static int __init gntdev_init(void)
> if (!xen_domain())
> return -ENODEV;
>
> - use_ptemod = xen_pv_domain();
> + use_ptemod = xen_pv_domain() &&
> + !xen_feature(XENFEAT_auto_translated_physmap);
>
> err = misc_register(&gntdev_miscdev);
> if (err != 0) {
> diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> index b2b0a37..9c0019d 100644
> --- a/drivers/xen/grant-table.c
> +++ b/drivers/xen/grant-table.c
> @@ -1029,14 +1029,19 @@ static void gnttab_unmap_frames_v2(void)
> static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
> {
> struct gnttab_setup_table setup;
> - unsigned long *frames;
> + unsigned long *frames, start_gpfn;
> unsigned int nr_gframes = end_idx + 1;
> int rc;
>
> - if (xen_hvm_domain()) {
> + if (xen_hvm_domain() || xen_feature(XENFEAT_auto_translated_physmap)) {
> struct xen_add_to_physmap xatp;
> unsigned int i = end_idx;
> rc = 0;
> +
> + if (xen_hvm_domain())
> + start_gpfn = xen_hvm_resume_frames >> PAGE_SHIFT;
> + else
> + start_gpfn = virt_to_pfn(gnttab_shared.addr);
> /*
> * Loop backwards, so that the first hypercall has the largest
> * index, ensuring that the table will grow only once.
> @@ -1045,7 +1050,7 @@ static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
> xatp.domid = DOMID_SELF;
> xatp.idx = i;
> xatp.space = XENMAPSPACE_grant_table;
> - xatp.gpfn = (xen_hvm_resume_frames >> PAGE_SHIFT) + i;
> + xatp.gpfn = start_gpfn + i;
> rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp);
> if (rc != 0) {
> printk(KERN_WARNING
> @@ -1108,7 +1113,7 @@ static void gnttab_request_version(void)
> int rc;
> struct gnttab_set_version gsv;
>
> - if (xen_hvm_domain())
> + if (xen_hvm_domain() || xen_feature(XENFEAT_auto_translated_physmap))
> gsv.version = 1;
> else
> gsv.version = 2;
> @@ -1136,12 +1141,25 @@ static void gnttab_request_version(void)
> int gnttab_resume(void)
> {
> unsigned int max_nr_gframes;
> + char *kmsg = "Failed to kmalloc pages for pv in hvm grant frames\n";
>
> gnttab_request_version();
> max_nr_gframes = gnttab_max_grant_frames();
> if (max_nr_gframes < nr_grant_frames)
> return -ENOSYS;
>
> + /* PVH note: xen will free existing kmalloc'd mfn in
> + * XENMEM_add_to_physmap. TBD/FIXME: use xen ballooning instead of
> + * kmalloc(). */
> + if (xen_pv_domain() && xen_feature(XENFEAT_auto_translated_physmap) &&
> + !gnttab_shared.addr) {
> + gnttab_shared.addr =
> + kmalloc(max_nr_gframes * PAGE_SIZE, GFP_KERNEL);
> + if (!gnttab_shared.addr) {
> + pr_warn("%s", kmsg);
> + return -ENOMEM;
> + }
> + }
> if (xen_pv_domain())
> return gnttab_map(0, nr_grant_frames - 1);
>
> --
> 1.7.7.6
>
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