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xen-devel
Re: [Xen-devel] [PATCH] vmx-copy_from_guest.patch
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xen-devel@xxxxxxxxxxxxxxxxxxx |
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Subject: |
Re: [Xen-devel] [PATCH] vmx-copy_from_guest.patch |
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From: |
Leendert van Doorn <leendert@xxxxxxxxxxxxxx> |
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Date: |
Tue, 06 Sep 2005 06:22:50 -0400 |
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Cc: |
"Sharma, Arun" <arun.sharma@xxxxxxxxx>, "Ling, Xiaofeng" <xiaofeng.ling@xxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>, "Petersson, Mats" <mats.petersson@xxxxxxx> |
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Tue, 06 Sep 2005 15:20:39 +0000 |
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IBM T.J. Watson Research Center |
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# seems current vmx_copy can not deal with copy over page boundary?
# so remove inst_copy_from_guest will cause problem.
Are you looking at the correct tree? Both xen-vt-testing and xen-unstable
have my newer vmx_copy that was introduced last Friday. It does handle
multiple pages.
int
vmx_copy(void *buf, unsigned long laddr, int size, int dir)
{
unsigned long gpa, mfn;
char *addr;
int count;
while (size > 0) {
count = PAGE_SIZE - (laddr & ~PAGE_MASK);
if (count > size)
count = size;
if (vmx_paging_enabled(current)) {
gpa = gva_to_gpa(laddr);
mfn = get_mfn_from_pfn(gpa >> PAGE_SHIFT);
} else
mfn = get_mfn_from_pfn(laddr >> PAGE_SHIFT);
if (mfn == INVALID_MFN)
return 0;
addr = (char *)map_domain_page(mfn) + (laddr & ~PAGE_MASK);
if (dir == VMX_COPY_IN)
memcpy(buf, addr, count);
else
memcpy(addr, buf, count);
unmap_domain_page(addr);
laddr += count;
buf += count;
size -= count;
}
return 1;
}
- Leendert
--
Leendert van Doorn <leendert@xxxxxxxxxxxxxx>
IBM T.J. Watson Research Center (914) 784-7831
30 Saw Mill River Road, Hawthorne, NY 10532
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