Revert "KVM: Avoid useless memory write when possible"
This reverts commit a3c870bdce
. While it
does save useless updates, it (probably) defeats the fork detector, causing
a massive performance loss.
Signed-off-by: Avi Kivity <avi@qumranet.com>
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5e58cfe41c
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7cfa4b0a43
@ -1070,10 +1070,8 @@ static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
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return 0;
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mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
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virt = kmap_atomic(page, KM_USER0);
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if (memcmp(virt + offset_in_page(gpa), val, bytes)) {
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kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
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memcpy(virt + offset_in_page(gpa), val, bytes);
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}
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kvm_mmu_pte_write(vcpu, gpa, virt + offset, val, bytes);
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memcpy(virt + offset_in_page(gpa), val, bytes);
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kunmap_atomic(virt, KM_USER0);
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return 1;
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}
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