From: Wei Liu <wei.liu@kernel.org>
To: Michael Kelley <mikelley@microsoft.com>
Cc: hpa@zytor.com, kys@microsoft.com, haiyangz@microsoft.com,
wei.liu@kernel.org, decui@microsoft.com, luto@kernel.org,
peterz@infradead.org, davem@davemloft.net, edumazet@google.com,
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robh@kernel.org, kw@linux.com, bhelgaas@google.com,
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robin.murphy@arm.com, thomas.lendacky@amd.com,
brijesh.singh@amd.com, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, dave.hansen@linux.intel.com,
Tianyu.Lan@microsoft.com, kirill.shutemov@linux.intel.com,
sathyanarayanan.kuppuswamy@linux.intel.com, ak@linux.intel.com,
isaku.yamahata@intel.com, dan.j.williams@intel.com,
jane.chu@oracle.com, seanjc@google.com, tony.luck@intel.com,
x86@kernel.org, linux-kernel@vger.kernel.org,
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iommu@lists.linux.dev
Subject: Re: [PATCH v4 1/1] x86/ioremap: Fix page aligned size calculation in __ioremap_caller()
Date: Fri, 25 Nov 2022 15:19:36 +0000 [thread overview]
Message-ID: <Y4DdCD7555d2SpkZ@liuwe-devbox-debian-v2> (raw)
In-Reply-To: <1669138842-30100-1-git-send-email-mikelley@microsoft.com>
On Tue, Nov 22, 2022 at 09:40:42AM -0800, Michael Kelley wrote:
> Current code re-calculates the size after aligning the starting and
> ending physical addresses on a page boundary. But the re-calculation
> also embeds the masking of high order bits that exceed the size of
> the physical address space (via PHYSICAL_PAGE_MASK). If the masking
> removes any high order bits, the size calculation results in a huge
> value that is likely to immediately fail.
>
> Fix this by re-calculating the page-aligned size first. Then mask any
> high order bits using PHYSICAL_PAGE_MASK.
>
> Fixes: ffa71f33a820 ("x86, ioremap: Fix incorrect physical address handling in PAE mode")
> Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
> Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
> ---
>
> This patch was previously Patch 1 of a larger series[1]. Breaking
> it out separately per discussion with Dave Hansen and Boris Petkov.
>
> [1] https://lore.kernel.org/linux-hyperv/1668624097-14884-1-git-send-email-mikelley@microsoft.com/
>
> arch/x86/mm/ioremap.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
> index 78c5bc6..6453fba 100644
> --- a/arch/x86/mm/ioremap.c
> +++ b/arch/x86/mm/ioremap.c
> @@ -217,9 +217,15 @@ static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
> * Mappings have to be page-aligned
> */
> offset = phys_addr & ~PAGE_MASK;
> - phys_addr &= PHYSICAL_PAGE_MASK;
> + phys_addr &= PAGE_MASK;
> size = PAGE_ALIGN(last_addr+1) - phys_addr;
>
> + /*
> + * Mask out any bits not part of the actual physical
> + * address, like memory encryption bits.
> + */
> + phys_addr &= PHYSICAL_PAGE_MASK;
> +
> retval = memtype_reserve(phys_addr, (u64)phys_addr + size,
> pcm, &new_pcm);
> if (retval) {
> --
> 1.8.3.1
>
next prev parent reply other threads:[~2022-11-25 15:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-22 17:40 [PATCH v4 1/1] x86/ioremap: Fix page aligned size calculation in __ioremap_caller() Michael Kelley
2022-11-25 15:19 ` Wei Liu [this message]
2022-11-28 14:43 ` Michael Kelley (LINUX)
2022-11-28 15:45 ` Borislav Petkov
2022-11-28 16:04 ` Michael Kelley (LINUX)
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