Re: [PATCH] KVM: PPC: BOOK3S: HV: Use base page size when comparing against slb value

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On 13.06.14 09:23, Aneesh Kumar K.V wrote:
With guest supporting Multiple page size per segment (MPSS),
hpte_page_size returns actual page size used. Add a new function to
return base page size and use that to compare against the the page size
calculated from SLB

Why? What does this fix? Is this a bug fix, an enhancement? Don't describe only what you do, but also why you do it.


Alex


Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
  arch/powerpc/include/asm/kvm_book3s_64.h | 19 +++++++++++++++++--
  arch/powerpc/kvm/book3s_64_mmu_hv.c      |  2 +-
  arch/powerpc/kvm/book3s_hv_rm_mmu.c      |  2 +-
  3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 34422be566ce..3d0f3fb9c6b6 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -202,8 +202,10 @@ static inline unsigned long compute_tlbie_rb(unsigned long v, unsigned long r,
  	return rb;
  }
-static inline unsigned long hpte_page_size(unsigned long h, unsigned long l)
+static inline unsigned long __hpte_page_size(unsigned long h, unsigned long l,
+					     bool is_base_size)
  {
+
  	int size, a_psize;
  	/* Look at the 8 bit LP value */
  	unsigned int lp = (l >> LP_SHIFT) & ((1 << LP_BITS) - 1);
@@ -218,14 +220,27 @@ static inline unsigned long hpte_page_size(unsigned long h, unsigned long l)
  				continue;
a_psize = __hpte_actual_psize(lp, size);
-			if (a_psize != -1)
+			if (a_psize != -1) {
+				if (is_base_size)
+					return 1ul << mmu_psize_defs[size].shift;
  				return 1ul << mmu_psize_defs[a_psize].shift;
+			}
  		}
}
  	return 0;
  }
+static inline unsigned long hpte_page_size(unsigned long h, unsigned long l)
+{
+	return __hpte_page_size(h, l, 0);
+}
+
+static inline unsigned long hpte_base_page_size(unsigned long h, unsigned long l)
+{
+	return __hpte_page_size(h, l, 1);
+}
+
  static inline unsigned long hpte_rpn(unsigned long ptel, unsigned long psize)
  {
  	return ((ptel & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT;
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index f53cf2eae36a..7ff45ed27c65 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -1567,7 +1567,7 @@ static ssize_t kvm_htab_write(struct file *file, const char __user *buf,
  				goto out;
  			}
  			if (!rma_setup && is_vrma_hpte(v)) {
-				unsigned long psize = hpte_page_size(v, r);
+				unsigned long psize = hpte_base_page_size(v, r);
  				unsigned long senc = slb_pgsize_encoding(psize);
  				unsigned long lpcr;
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
index 87624ab5ba82..c6aca75b8376 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
@@ -839,7 +839,7 @@ long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v,
  			 * to check against the actual page size.
  			 */
  			if ((v & valid) && (v & mask) == val &&
-			    hpte_page_size(v, r) == (1ul << pshift))
+			    hpte_base_page_size(v, r) == (1ul << pshift))
  				/* Return with the HPTE still locked */
  				return (hash << 3) + (i >> 1);

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