[Patch] (big) real mode emulation - emulator_write_std

[Nitin A Kamble <nitin.a.kamble-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

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Hi Avi,
  I have been collected quiet a few patches in my tree now. They are all
in dirty(style, debug) state. Now I started cleaning some of the code in
my tree, and cutting patches again. I plan to send you steady stream of
patches now. so you can expect lots of patches coming from me in coming
days now.

About the status of the big real mode; In my private tree I have evolved
the segment registers support for the emulator to next level now. I
think I can also cut that patch also and send it to you. now it is much
more complete than earlier. As of today the SuSe Linux 10.1 is
proceeding in the big-real mode into the int 10 call. that is with the
help emulation of about 20 new instructions, and also the infrastructure
support for those instructions.  Probably I should keep a count of
instructions emulated in the big real mode to gauge my progress. 

I am cutting my tree into simple patches, so it will be easy for you to
understand and apply/comment. 
    
Thanks & Regards,
Nitin 
Open Source Technology Center, Intel Corporation.
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commit a757404387d3580f1a9dca86b2caf142103c6bdf
Author: Nitin A Kamble <nitin.a.kamble@intel.com>
Date:   Fri Aug 10 17:30:16 2007 -0700

    Implement the function emulator_write_std()
    
    Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index f7ff231..4a213e2 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -962,8 +962,35 @@ static int emulator_write_std(unsigned long addr,
 			      unsigned int bytes,
 			      struct kvm_vcpu *vcpu)
 {
-	pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
-	return X86EMUL_UNHANDLEABLE;
+	void *data = (void *) val;
+
+	while (bytes) {
+		gpa_t gpa;
+		unsigned offset = addr & (PAGE_SIZE-1);
+		unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
+		unsigned long pfn;
+		struct page *page;
+		void *page_virt;
+
+		gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
+		if (gpa == UNMAPPED_GVA)
+			return X86EMUL_PROPAGATE_FAULT;
+		pfn = gpa >> PAGE_SHIFT;
+		page = gfn_to_page(vcpu->kvm, pfn);
+		if (!page)
+			return X86EMUL_UNHANDLEABLE;
+		page_virt = kmap_atomic(page, KM_USER0);
+
+		memcpy(page_virt + offset, data, tocopy);
+
+		kunmap_atomic(page_virt, KM_USER0);
+
+		bytes -= tocopy;
+		data += tocopy;
+		addr += tocopy;
+	}
+
+	return X86EMUL_CONTINUE;
 }
 
 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,

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