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KVM: emulator: remove duplicated limit check

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The check on the higher limit of the segment, and the check on the
maximum accessible size, is the same for both expand-up and
expand-down segments.  Only the computation of "lim" varies.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-11-19 18:33:38 +01:00
parent 01485a2230
commit 997b04128d
1 changed files with 4 additions and 9 deletions
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13
arch/x86/kvm/emulate.c
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@ -654,20 +654,15 @@ static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
if (!fetch && (desc.type & 8) && !(desc.type & 2))
goto bad;
lim = desc_limit_scaled(&desc);
if ((desc.type & 8) || !(desc.type & 4)) {
/* expand-up segment */
if (addr.ea > lim)
goto bad;
*max_size = min_t(u64, ~0u, (u64)lim + 1 - addr.ea);
} else {
if (!(desc.type & 8) && (desc.type & 4)) {
/* expand-down segment */
if (addr.ea <= lim)
goto bad;
lim = desc.d ? 0xffffffff : 0xffff;
if (addr.ea > lim)
goto bad;
*max_size = min_t(u64, ~0u, (u64)lim + 1 - addr.ea);
}
if (addr.ea > lim)
goto bad;
*max_size = min_t(u64, ~0u, (u64)lim + 1 - addr.ea);
if (size > *max_size)
goto bad;
la &= (u32)-1;