[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] [PATCH] Fix write parameter masking for 32-bit guests.
Well, the method in the previous mail may be a little complex -- I think the simplest way is: - if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) && (req->size != sizeof(req->data))) + if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) && (req->size != sizeof(long))) Since sizeof(long) = 4 in 32-bit platform, and = 8 in 64-bit platform, the code here can work properly in 32/64-bit platforms. -- Dexuan -----Original Message----- From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Cui, Dexuan Sent: 2007年5月13日 15:49 To: xen-devel@xxxxxxxxxxxxxxxxxxx Cc: Keir Fraser Subject: [Xen-devel] [PATCH] Fix write parameter masking for 32-bit guests. Changeset 15046:e527b4ff1948 breaks 32-bit HVM guest: when req->size is 4, "1UL << 32" returns 1 in IA32 system, so the mask becomes 0 wrongly. The attached patch fixes this by using 64-bit left-shift. Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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