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Date: Thu, 18 Oct 2012 14:27:37 +0100
From: Stefano Stabellini <stefano.stabellini@...citrix.com>
To: Ian Campbell <ian.campbell@...rix.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
Mukesh Rathor <mukesh.rathor@...cle.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: Re: [PATCH 5/6] xen: arm: implement remap interfaces needed for
privcmd mappings.
On Wed, 17 Oct 2012, Ian Campbell wrote:
> We use XENMEM_add_to_physmap_range which is the preferred interface
> for foreign mappings.
>
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
It looks OK but there are few code style issues, please run the patch
through checkpatch.
> arch/arm/include/asm/xen/interface.h | 1 +
> arch/arm/xen/enlighten.c | 100 +++++++++++++++++++++++++++++++++-
> arch/x86/include/asm/xen/interface.h | 1 +
> include/xen/interface/memory.h | 18 ++++++
> 4 files changed, 117 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/include/asm/xen/interface.h b/arch/arm/include/asm/xen/interface.h
> index 1d6ef9c..007e6da 100644
> --- a/arch/arm/include/asm/xen/interface.h
> +++ b/arch/arm/include/asm/xen/interface.h
> @@ -43,6 +43,7 @@ DEFINE_GUEST_HANDLE(void);
> DEFINE_GUEST_HANDLE(uint64_t);
> DEFINE_GUEST_HANDLE(uint32_t);
> DEFINE_GUEST_HANDLE(xen_pfn_t);
> +DEFINE_GUEST_HANDLE(xen_ulong_t);
>
> /* Maximum number of virtual CPUs in multi-processor guests. */
> #define MAX_VIRT_CPUS 1
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index ba5cc13..6bb4630 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -9,6 +9,7 @@
> #include <xen/platform_pci.h>
> #include <xen/xenbus.h>
> #include <xen/page.h>
> +#include <xen/xen-ops.h>
> #include <asm/xen/hypervisor.h>
> #include <asm/xen/hypercall.h>
> #include <linux/interrupt.h>
> @@ -18,6 +19,8 @@
> #include <linux/of_irq.h>
> #include <linux/of_address.h>
>
> +#include <linux/mm.h>
> +
> struct start_info _xen_start_info;
> struct start_info *xen_start_info = &_xen_start_info;
> EXPORT_SYMBOL_GPL(xen_start_info);
> @@ -43,15 +46,106 @@ EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
>
> static __read_mostly int xen_events_irq = -1;
>
> +/* map fgmfn of domid to lpfn in the current domain */
> +static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
> + unsigned int domid)
> +{
> + int rc;
> + struct xen_add_to_physmap_range xatp = {
> + .domid = DOMID_SELF,
> + .foreign_domid = domid,
> + .size = 1,
> + .space = XENMAPSPACE_gmfn_foreign,
> + };
> + xen_ulong_t idx = fgmfn;
> + xen_pfn_t gpfn = lpfn;
> +
> + set_xen_guest_handle(xatp.idxs, &idx);
> + set_xen_guest_handle(xatp.gpfns, &gpfn);
> +
> + rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
> + if (rc) {
> + pr_warn("Failed to map pfn to mfn rc:%d pfn:%lx mfn:%lx\n",
> + rc, lpfn, fgmfn);
> + return 1;
> + }
> + return 0;
> +}
> +
> +struct remap_data {
> + xen_pfn_t fgmfn; /* foreign domain's gmfn */
> + pgprot_t prot;
> + domid_t domid;
> + struct vm_area_struct *vma;
> + int index;
> + struct page **pages;
> + struct xen_remap_mfn_info *info;
> +};
> +
> +static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
> + void *data)
> +{
> + struct remap_data *info = data;
> + struct page *page = info->pages[info->index++];
> + unsigned long pfn = page_to_pfn(page);
> + pte_t pte = pfn_pte(pfn, info->prot);
> +
> + if (map_foreign_page(pfn, info->fgmfn, info->domid))
> + return -EFAULT;
> + set_pte_at(info->vma->vm_mm, addr, ptep, pte);
> +
> + return 0;
> +}
> +
> int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
> unsigned long addr,
> - unsigned long mfn, int nr,
> - pgprot_t prot, unsigned domid)
> + xen_pfn_t mfn, int nr,
> + pgprot_t prot, unsigned domid,
> + struct page **pages)
> {
> - return -ENOSYS;
> + int err;
> + struct remap_data data;
> +
> + /* TBD: Batching, current sole caller only does page at a time */
> + if (nr > 1)
> + return -EINVAL;
> +
> + data.fgmfn = mfn;
> + data.prot = prot;
> + data.domid = domid;
> + data.vma = vma;
> + data.index = 0;
> + data.pages = pages;
> + err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
> + remap_pte_fn, &data);
> + return err;
> }
> EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
>
> +int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
> + struct page **pages, int nr)
> +{
> + int i;
> +
> + for (i=0; i<nr; i++) {
> + struct xen_remove_from_physmap xrp;
> + unsigned long rc, pfn;
> +
> + pfn = page_to_pfn(pages[i]);
> +
> + xrp.domid = DOMID_SELF;
> + xrp.gpfn = pfn;
> + rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
> + if (rc) {
> + pr_warn("Failed to unmap pfn:%lx rc:%ld\n",
> + pfn, rc);
> + return rc;
> + }
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
> +
> /*
> * see Documentation/devicetree/bindings/arm/xen.txt for the
> * documentation of the Xen Device Tree format.
> diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h
> index 25669c3..6246d80 100644
> --- a/arch/x86/include/asm/xen/interface.h
> +++ b/arch/x86/include/asm/xen/interface.h
> @@ -63,6 +63,7 @@ DEFINE_GUEST_HANDLE(void);
> DEFINE_GUEST_HANDLE(uint64_t);
> DEFINE_GUEST_HANDLE(uint32_t);
> DEFINE_GUEST_HANDLE(xen_pfn_t);
> +DEFINE_GUEST_HANDLE(xen_ulong_t);
> #endif
>
> #ifndef HYPERVISOR_VIRT_START
> diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
> index 91bdc2a..eb2d3e5 100644
> --- a/include/xen/interface/memory.h
> +++ b/include/xen/interface/memory.h
> @@ -190,6 +190,24 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
> /*** REMOVED ***/
> /*#define XENMEM_translate_gpfn_list 8*/
>
> +#define XENMEM_add_to_physmap_range 23
> +struct xen_add_to_physmap_range {
> + /* Which domain to change the mapping for. */
> + domid_t domid;
> + uint16_t space; /* => enum phys_map_space */
> +
> + /* Number of pages to go through */
> + uint16_t size;
> + domid_t foreign_domid; /* IFF gmfn_foreign */
> +
> + /* Indexes into space being mapped. */
> + GUEST_HANDLE(xen_ulong_t) idxs;
> +
> + /* GPFN in domid where the source mapping page should appear. */
> + GUEST_HANDLE(xen_pfn_t) gpfns;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range);
> +
> /*
> * Returns the pseudo-physical memory map as it was when the domain
> * was started (specified by XENMEM_set_memory_map).
> --
> 1.7.2.5
>
--
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