From: 刘晓建 <zjliu@nudt.edu.cn>
To: kvm@vger.kernel.org
Subject: [PATCH 3/3] KVM: pci passthrough un-page-aligned mmio device on machines w/o VT-d
Date: Mon, 15 Dec 2008 23:01:23 +0800 [thread overview]
Message-ID: <429353283.11759@nudt.edu.cn> (raw)
the KVM79 doesn't support the case of running pci passthrough on a machine w/o
VT-d. The following fixes it
---
diff -uNr kvm-79/kernel/x86/kvm_main.c kvm-79-fixed/kernel/x86/kvm_main.c
--- kvm-79/kernel/x86/kvm_main.c 2008-11-12 20:24:04.000000000 +0800
+++ kvm-79-fixed/kernel/x86/kvm_main.c 2008-12-12 15:56:19.000000000 +0800
@@ -1059,11 +1061,22 @@
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
pfn_t pfn;
+ pfn_t reserved_top = 0;
pfn = gfn_to_pfn(kvm, gfn);
if (!kvm_is_mmio_pfn(pfn))
return pfn_to_page(pfn);
+#ifdef CONFIG_RESERVE_PHYSICAL_START
+ reserved_top = __PHYSICAL_START>>PAGE_SHIFT;
+#else
+#warning if you want to use pci passthrough w/o mechanisms like VT-d,
+#warning please define CONFIG_RESERVE_PHYSICAL_START and __PHYSICAL_START,
+#warning when compiling your linux kernel!
+#endif
+ if(pfn < reserved_top)
+ return pfn_to_page(pfn);
+
WARN_ON(kvm_is_mmio_pfn(pfn));
get_page(bad_page);
Xiaojian Liu
next reply other threads:[~2008-12-15 15:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-15 15:01 刘晓建 [this message]
2008-12-16 5:19 ` [PATCH 3/3] KVM: pci passthrough un-page-aligned mmio device on machines w/o VT-d Zhang, Xiantao
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