linux-kernel - Re: [PATCH v2] KVM: IOMMU: hva align mapping page size

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20131105075636.GI7513@redhat.com>
Date:	Tue, 5 Nov 2013 09:56:37 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Greg Edwards <gedwards@....com>
Cc:	kvm@...r.kernel.org,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH v2] KVM: IOMMU: hva align mapping page size

On Mon, Nov 04, 2013 at 09:08:12AM -0700, Greg Edwards wrote:
> When determining the page size we could use to map with the IOMMU, the
> page size should also be aligned with the hva, not just the gfn.  The
> gfn may not reflect the real alignment within the hugetlbfs file.
> 
For some reason you dropped very good commit message from v1. I applied
v2 with v1 commit message.

> Signed-off-by: Greg Edwards <gedwards@....com>
> Cc: stable@...r.kernel.org
> ---
>  virt/kvm/iommu.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
> index 72a130b..c329c8f 100644
> --- a/virt/kvm/iommu.c
> +++ b/virt/kvm/iommu.c
> @@ -103,6 +103,10 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
>  		while ((gfn << PAGE_SHIFT) & (page_size - 1))
>  			page_size >>= 1;
>  
> +		/* Make sure hva is aligned to the page size we want to map */
> +		while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
> +			page_size >>= 1;
> +
>  		/*
>  		 * Pin all pages we are about to map in memory. This is
>  		 * important because we unmap and unpin in 4kb steps later.
> -- 
> 1.8.3.2
> 
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

--
			Gleb.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/