From: Stefano Stabellini <sstabellini@kernel.org>
To: Jan Beulich <jbeulich@suse.com>
Cc: Juergen Gross <jgross@suse.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Stefano Stabellini <sstabellini@kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"hch@lst.de" <hch@lst.de>, Konrad Wilk <konrad.wilk@oracle.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>
Subject: Re: [PATCH v2 1/4] swiotlb-xen: ensure to issue well-formed XENMEM_exchange requests
Date: Fri, 17 Sep 2021 13:04:50 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.21.2109171304380.21985@sstabellini-ThinkPad-T480s> (raw)
In-Reply-To: <7b3998e3-1233-4e5a-89ec-d740e77eb166@suse.com>
On Fri, 17 Sep 2021, Jan Beulich wrote:
> While the hypervisor hasn't been enforcing this, we would still better
> avoid issuing requests with GFNs not aligned to the requested order.
> Instead of altering the value also in the call to panic(), drop it
> there for being static and hence easy to determine without being part
> of the panic message.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
> ---
> I question how useful it is to wrap "bytes" in PAGE_ALIGN(), when it is
> a multiple of a segment's size anyway (or at least was supposed to be,
> prior to "swiotlb-xen: maintain slab count properly"). But that's
> perhaps yet another separate patch.
> ---
> v2: Drop logging of alignment. Wrap lines.
>
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -230,10 +230,11 @@ retry:
> /*
> * Get IO TLB memory from any location.
> */
> - start = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE);
> + start = memblock_alloc(PAGE_ALIGN(bytes),
> + IO_TLB_SEGSIZE << IO_TLB_SHIFT);
> if (!start)
> - panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
> - __func__, PAGE_ALIGN(bytes), PAGE_SIZE);
> + panic("%s: Failed to allocate %lu bytes\n",
> + __func__, PAGE_ALIGN(bytes));
>
> /*
> * And replace that memory with pages under 4GB.
>
next prev parent reply other threads:[~2021-09-17 20:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-17 10:43 [PATCH v2 0/4] swiotlb-xen: remaining fixes and adjustments Jan Beulich
2021-09-17 10:45 ` [PATCH v2 1/4] swiotlb-xen: ensure to issue well-formed XENMEM_exchange requests Jan Beulich
2021-09-17 20:04 ` Stefano Stabellini [this message]
2021-09-17 10:48 ` [PATCH v2 2/4] PCI: only build xen-pcifront in PV-enabled environments Jan Beulich
2021-09-17 16:28 ` Bjorn Helgaas
2021-09-17 10:49 ` [PATCH v2 3/4] xen/pci-swiotlb: reduce visibility of symbols Jan Beulich
2021-09-17 10:50 ` [PATCH v2 4/4] swiotlb-xen: this is PV-only on x86 Jan Beulich
2021-09-20 15:19 ` [PATCH v2 0/4] swiotlb-xen: remaining fixes and adjustments Juergen Gross
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