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xen-devel
[Xen-devel] Re: [PATCH] bypass passthrough MMIO mfns in vram dirty logic
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To: |
"He, Qing" <qing.he@xxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH] bypass passthrough MMIO mfns in vram dirty logic |
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From: |
Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx> |
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Date: |
Mon, 12 May 2008 10:42:32 +0200 |
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Cc: |
xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Kamala Narasimhan <Kamala.Narasimhan@xxxxxxxxxx> |
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Mon, 12 May 2008 02:16:10 -0700 |
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Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>, "He, Qing" <qing.he@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Kamala Narasimhan <Kamala.Narasimhan@xxxxxxxxxx> |
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Mutt/1.5.12-2006-07-14 |
He, Qing, le Mon 12 May 2008 16:31:22 +0800, a écrit :
> This patch fixes the fatal page fault when vram dirty logic handles MMIO
> of passthrough devices.
>
> Signed-off-by: Qing He <qing.he@xxxxxxxxx>
Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>
> diff -r 810d8c3ac992 xen/arch/x86/mm/shadow/multi.c
> --- a/xen/arch/x86/mm/shadow/multi.c Thu May 08 16:58:33 2008 +0100
> +++ b/xen/arch/x86/mm/shadow/multi.c Tue May 13 00:19:08 2008 +0800
> @@ -1268,6 +1268,9 @@ static inline void shadow_vram_get_l1e(s
> if ( !d->dirty_vram ) return;
>
> mfn = shadow_l1e_get_mfn(new_sl1e);
> +
> + if ( !mfn_valid(mfn) ) return; /* m2p for mmio_direct may not exist
> */
> +
> gfn = mfn_to_gfn(d, mfn);
>
> if ( (gfn >= d->dirty_vram->begin_pfn) && (gfn <
> d->dirty_vram->end_pfn) ) {
> @@ -1293,6 +1296,9 @@ static inline void shadow_vram_put_l1e(s
> if ( !d->dirty_vram ) return;
>
> mfn = shadow_l1e_get_mfn(old_sl1e);
> +
> + if ( !mfn_valid(mfn) ) return;
> +
> gfn = mfn_to_gfn(d, mfn);
>
> if ( (gfn >= d->dirty_vram->begin_pfn) && (gfn <
> d->dirty_vram->end_pfn) ) {
--
Samuel
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cette adresse que ce soit un pirate ou une victime qu'il se manifeste,
cette personne pourrait bien etre un petit malin
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