From: Julien Grall <julien.grall@arm.com>
To: Stefano Stabellini <sstabellini@kernel.org>,
xen-devel@lists.xenproject.org
Cc: Stefano Stabellini <stefanos@xilinx.com>,
JBeulich@suse.com, andrew.cooper3@citrix.com
Subject: Re: [PATCH 1/6] xen: extend XEN_DOMCTL_memory_mapping to handle cacheability
Date: Wed, 27 Feb 2019 19:28:42 +0000 [thread overview]
Message-ID: <c3716c11-6d87-4f2d-25d7-3d83537a9ca7@arm.com> (raw)
In-Reply-To: <1551222427-21749-1-git-send-email-sstabellini@kernel.org>
Hi Stefano,
On 2/26/19 11:07 PM, Stefano Stabellini wrote:
> Reuse the existing padding field to pass cacheability information about
> the memory mapping, specifically, whether the memory should be mapped as
> normal memory or as device memory (this is what we have today).
>
> Add a cacheability parameter to map_mmio_regions. 0 means device
> memory, which is what we have today.
>
> On ARM, map device memory as p2m_mmio_direct_dev (as it is already done
> today) and normal memory as p2m_ram_rw.
>
> On x86, return error if the cacheability requested is not device memory.
>
> Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
> CC: JBeulich@suse.com
> CC: andrew.cooper3@citrix.com
> ---
> xen/arch/arm/gic-v2.c | 3 ++-
> xen/arch/arm/p2m.c | 19 +++++++++++++++++--
> xen/arch/arm/platforms/exynos5.c | 4 ++--
> xen/arch/arm/platforms/omap5.c | 8 ++++----
> xen/arch/arm/vgic-v2.c | 2 +-
> xen/arch/arm/vgic/vgic-v2.c | 2 +-
> xen/arch/x86/hvm/dom0_build.c | 7 +++++--
> xen/arch/x86/mm/p2m.c | 6 +++++-
> xen/common/domctl.c | 8 +++++---
> xen/drivers/vpci/header.c | 3 ++-
> xen/include/public/domctl.h | 4 +++-
> xen/include/xen/p2m-common.h | 3 ++-
> 12 files changed, 49 insertions(+), 20 deletions(-)
>
> diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
> index e7eb01f..1ea3da2 100644
> --- a/xen/arch/arm/gic-v2.c
> +++ b/xen/arch/arm/gic-v2.c
> @@ -690,7 +690,8 @@ static int gicv2_map_hwdown_extra_mappings(struct domain *d)
>
> ret = map_mmio_regions(d, gaddr_to_gfn(v2m_data->addr),
> PFN_UP(v2m_data->size),
> - maddr_to_mfn(v2m_data->addr));
> + maddr_to_mfn(v2m_data->addr),
> + CACHEABILITY_DEVMEM);
> if ( ret )
> {
> printk(XENLOG_ERR "GICv2: Map v2m frame to d%d failed.\n",
> diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
> index 30cfb01..5b8fcc5 100644
> --- a/xen/arch/arm/p2m.c
> +++ b/xen/arch/arm/p2m.c
> @@ -1068,9 +1068,24 @@ int unmap_regions_p2mt(struct domain *d,
> int map_mmio_regions(struct domain *d,
> gfn_t start_gfn,
> unsigned long nr,
> - mfn_t mfn)
> + mfn_t mfn,
> + uint32_t cache_policy)
Rather than extending map_mmio_regions, I would prefer if we kill this
function (and unmap_mmio_mmio_regions) and instead use map_regions_p2mt.
This means the conversation to p2mt should be done in the DOMCTL handling.
> {
> - return p2m_insert_mapping(d, start_gfn, nr, mfn, p2m_mmio_direct_dev);
> + p2m_type_t t;
> +
> + switch ( cache_policy )
> + {
> + case CACHEABILITY_MEMORY:
> + t = p2m_ram_rw;
> + break;
> + case CACHEABILITY_DEVMEM:
> + t = p2m_mmio_direct_dev;
> + break;
> + default:
> + return -ENOSYS;
We tend to use EOPNOTSUPP in such a case.
Cheers,
--
Julien Grall
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next prev parent reply other threads:[~2019-02-27 19:28 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-26 23:06 [PATCH 0/6] iomem cacheability Stefano Stabellini
2019-02-26 23:07 ` [PATCH 1/6] xen: extend XEN_DOMCTL_memory_mapping to handle cacheability Stefano Stabellini
2019-02-26 23:18 ` Julien Grall
2019-04-20 0:02 ` Stefano Stabellini
2019-04-20 0:02 ` [Xen-devel] " Stefano Stabellini
2019-04-21 17:32 ` Julien Grall
2019-04-21 17:32 ` [Xen-devel] " Julien Grall
2019-04-22 21:59 ` Stefano Stabellini
2019-04-22 21:59 ` [Xen-devel] " Stefano Stabellini
2019-04-24 10:42 ` Julien Grall
2019-04-24 10:42 ` [Xen-devel] " Julien Grall
2019-02-27 10:34 ` Jan Beulich
2019-04-17 21:12 ` Stefano Stabellini
2019-04-17 21:12 ` [Xen-devel] " Stefano Stabellini
2019-04-17 21:25 ` Julien Grall
2019-04-17 21:25 ` [Xen-devel] " Julien Grall
2019-04-17 21:55 ` Stefano Stabellini
2019-04-17 21:55 ` [Xen-devel] " Stefano Stabellini
2019-04-25 10:41 ` Jan Beulich
2019-04-25 10:41 ` [Xen-devel] " Jan Beulich
2019-04-25 22:31 ` Stefano Stabellini
2019-04-25 22:31 ` [Xen-devel] " Stefano Stabellini
2019-04-26 7:12 ` Jan Beulich
2019-04-26 7:12 ` [Xen-devel] " Jan Beulich
2019-02-27 19:28 ` Julien Grall [this message]
2019-04-19 23:20 ` Stefano Stabellini
2019-04-19 23:20 ` [Xen-devel] " Stefano Stabellini
2019-04-21 17:14 ` Julien Grall
2019-04-21 17:14 ` [Xen-devel] " Julien Grall
2019-04-22 17:33 ` Stefano Stabellini
2019-04-22 17:33 ` [Xen-devel] " Stefano Stabellini
2019-04-22 17:42 ` Julien Grall
2019-04-22 17:42 ` [Xen-devel] " Julien Grall
2019-02-27 21:02 ` Julien Grall
2019-02-26 23:07 ` [PATCH 2/6] libxc: xc_domain_memory_mapping, " Stefano Stabellini
2019-02-26 23:07 ` [PATCH 3/6] libxl/xl: add cacheability option to iomem Stefano Stabellini
2019-02-27 20:02 ` Julien Grall
2019-04-19 23:13 ` Stefano Stabellini
2019-04-19 23:13 ` [Xen-devel] " Stefano Stabellini
2019-02-26 23:07 ` [PATCH 4/6] xen/arm: keep track of reserved-memory regions Stefano Stabellini
2019-02-28 14:38 ` Julien Grall
2019-02-26 23:07 ` [PATCH 5/6] xen/arm: map reserved-memory regions as normal memory in dom0 Stefano Stabellini
2019-02-26 23:45 ` Julien Grall
2019-04-22 22:42 ` Stefano Stabellini
2019-04-22 22:42 ` [Xen-devel] " Stefano Stabellini
2019-04-23 8:09 ` Julien Grall
2019-04-23 8:09 ` [Xen-devel] " Julien Grall
2019-04-23 17:32 ` Stefano Stabellini
2019-04-23 17:32 ` [Xen-devel] " Stefano Stabellini
2019-04-23 18:37 ` Julien Grall
2019-04-23 18:37 ` [Xen-devel] " Julien Grall
2019-04-23 21:34 ` Stefano Stabellini
2019-04-23 21:34 ` [Xen-devel] " Stefano Stabellini
2019-02-26 23:07 ` [PATCH 6/6] xen/docs: how to map a page between dom0 and domU using iomem Stefano Stabellini
2019-03-03 17:20 ` [PATCH 0/6] iomem cacheability Amit Tomer
2019-03-05 21:22 ` Stefano Stabellini
2019-03-05 22:45 ` Julien Grall
2019-03-06 11:46 ` Amit Tomer
2019-03-06 22:42 ` Stefano Stabellini
2019-03-06 22:59 ` Julien Grall
2019-03-07 8:42 ` Amit Tomer
2019-03-07 10:04 ` Julien Grall
2019-03-07 21:24 ` Stefano Stabellini
2019-03-08 10:10 ` Amit Tomer
2019-03-08 16:37 ` Julien Grall
2019-03-08 17:44 ` Amit Tomer
2019-03-06 11:30 ` Amit Tomer
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