linux-kernel - [PATCH 1/2] KVM: MMU: prepare to support mapping of VM_IO and VM

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Date:	Thu, 30 Jun 2016 15:01:50 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	Kirti Wankhede <kwankhede@...dia.com>, Neo Jia <cjia@...dia.com>,
	Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>
Subject: [PATCH 1/2] KVM: MMU: prepare to support mapping of VM_IO and VM_PFNMAP frames

Handle VM_IO like VM_PFNMAP, as is common in the rest of Linux; extract
the formula to convert hva->pfn into a new function, which will soon
gain more capabilities.

Cc: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 virt/kvm/kvm_main.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index ef54b4c31792..5aae59e00bef 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1442,6 +1442,16 @@ static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
 	return true;
 }
 
+static int hva_to_pfn_remapped(struct vm_area_struct *vma,
+			       unsigned long addr, bool *async,
+			       bool write_fault, kvm_pfn_t *p_pfn)
+{
+	*p_pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
+		vma->vm_pgoff;
+	BUG_ON(!kvm_is_reserved_pfn(*p_pfn));
+	return 0;
+}
+
 /*
  * Pin guest page in memory and return its pfn.
  * @addr: host virtual address which maps memory to the guest
@@ -1461,7 +1471,7 @@ static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
 {
 	struct vm_area_struct *vma;
 	kvm_pfn_t pfn = 0;
-	int npages;
+	int npages, r;
 
 	/* we can do it either atomically or asynchronously, not both */
 	BUG_ON(atomic && async);
@@ -1487,10 +1497,10 @@ static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
 
 	if (vma == NULL)
 		pfn = KVM_PFN_ERR_FAULT;
-	else if ((vma->vm_flags & VM_PFNMAP)) {
-		pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
-			vma->vm_pgoff;
-		BUG_ON(!kvm_is_reserved_pfn(pfn));
+	else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
+		r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn);
+		if (r < 0)
+			pfn = KVM_PFN_ERR_FAULT;
 	} else {
 		if (async && vma_is_valid(vma, write_fault))
 			*async = true;
-- 
1.8.3.1