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[09/50] KVM: PPC: E500: Support hugetlbfs

Message ID 1325639448-9494-10-git-send-email-agraf@suse.de
State New, archived
Headers show

Commit Message

Alexander Graf Jan. 4, 2012, 1:10 a.m. UTC 
With hugetlbfs support emerging on e500, we should also support KVM
backing its guest memory by it.

This patch adds support for hugetlbfs into the e500 shadow mmu code.

Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Scott Wood <scottwood@freescale.com>

---

v1 -> v2:

  - address scott's comments

v2 -> v3:

  - fix whitespace
---
 arch/powerpc/kvm/e500_tlb.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

Comments

Avi Kivity Jan. 8, 2012, 1:16 p.m. UTC | #1 
On 01/04/2012 03:10 AM, Alexander Graf wrote:
> With hugetlbfs support emerging on e500, we should also support KVM
> backing its guest memory by it.
>
> This patch adds support for hugetlbfs into the e500 shadow mmu code.
>
> Signed-off-by: Alexander Graf <agraf@suse.de>
> Acked-by: Scott Wood <scottwood@freescale.com>
>
> ---
>
> v1 -> v2:
>
>   - address scott's comments
>
> v2 -> v3:
>
>   - fix whitespace

The patch log should be removed from the commit log.
diff mbox

Patch

diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c
index ec17148..6fefb91 100644
--- a/arch/powerpc/kvm/e500_tlb.c
+++ b/arch/powerpc/kvm/e500_tlb.c
@@ -24,6 +24,7 @@ 
 #include <linux/sched.h>
 #include <linux/rwsem.h>
 #include <linux/vmalloc.h>
+#include <linux/hugetlb.h>
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_e500.h>
 
@@ -673,12 +674,31 @@  static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 				pfn &= ~(tsize_pages - 1);
 				break;
 			}
+		} else if (vma && hva >= vma->vm_start &&
+			   (vma->vm_flags & VM_HUGETLB)) {
+			unsigned long psize = vma_kernel_pagesize(vma);
+
+			tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
+				MAS1_TSIZE_SHIFT;
+
+			/*
+			 * Take the largest page size that satisfies both host
+			 * and guest mapping
+			 */
+			tsize = min(__ilog2(psize) - 10, tsize);
+
+			/*
+			 * e500 doesn't implement the lowest tsize bit,
+			 * or 1K pages.
+			 */
+			tsize = max(BOOK3E_PAGESZ_4K, tsize & ~1);
 		}
 
 		up_read(&current->mm->mmap_sem);
 	}
 
 	if (likely(!pfnmap)) {
+		unsigned long tsize_pages = 1 << (tsize + 10 - PAGE_SHIFT);
 		pfn = gfn_to_pfn_memslot(vcpu_e500->vcpu.kvm, slot, gfn);
 		if (is_error_pfn(pfn)) {
 			printk(KERN_ERR "Couldn't get real page for gfn %lx!\n",
@@ -686,6 +706,10 @@  static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 			kvm_release_pfn_clean(pfn);
 			return;
 		}
+
+		/* Align guest and physical address to page map boundaries */
+		pfn &= ~(tsize_pages - 1);
+		gvaddr &= ~((tsize_pages << PAGE_SHIFT) - 1);
 	}
 
 	/* Drop old ref and setup new one. */