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authorLinus Torvalds <torvalds@linux-foundation.org>2014-12-18 16:05:28 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-18 16:05:28 -0800
commit66dcff86ba40eebb5133cccf450878f2bba102ef (patch)
treee7eb49ad9316989a529b00303d2dd2cffa61a7f5 /arch/s390/mm/pgtable.c
parent91ed9e8a32d9a76adc59c83f8b40024076cf8a02 (diff)
parent2c4aa55a6af070262cca425745e8e54310e96b8d (diff)
downloadop-kernel-dev-66dcff86ba40eebb5133cccf450878f2bba102ef.zip
op-kernel-dev-66dcff86ba40eebb5133cccf450878f2bba102ef.tar.gz
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM update from Paolo Bonzini: "3.19 changes for KVM: - spring cleaning: removed support for IA64, and for hardware- assisted virtualization on the PPC970 - ARM, PPC, s390 all had only small fixes For x86: - small performance improvements (though only on weird guests) - usual round of hardware-compliancy fixes from Nadav - APICv fixes - XSAVES support for hosts and guests. XSAVES hosts were broken because the (non-KVM) XSAVES patches inadvertently changed the KVM userspace ABI whenever XSAVES was enabled; hence, this part is going to stable. Guest support is just a matter of exposing the feature and CPUID leaves support" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (179 commits) KVM: move APIC types to arch/x86/ KVM: PPC: Book3S: Enable in-kernel XICS emulation by default KVM: PPC: Book3S HV: Improve H_CONFER implementation KVM: PPC: Book3S HV: Fix endianness of instruction obtained from HEIR register KVM: PPC: Book3S HV: Remove code for PPC970 processors KVM: PPC: Book3S HV: Tracepoints for KVM HV guest interactions KVM: PPC: Book3S HV: Simplify locking around stolen time calculations arch: powerpc: kvm: book3s_paired_singles.c: Remove unused function arch: powerpc: kvm: book3s_pr.c: Remove unused function arch: powerpc: kvm: book3s.c: Remove some unused functions arch: powerpc: kvm: book3s_32_mmu.c: Remove unused function KVM: PPC: Book3S HV: Check wait conditions before sleeping in kvmppc_vcore_blocked KVM: PPC: Book3S HV: ptes are big endian KVM: PPC: Book3S HV: Fix inaccuracies in ICP emulation for H_IPI KVM: PPC: Book3S HV: Fix KSM memory corruption KVM: PPC: Book3S HV: Fix an issue where guest is paused on receiving HMI KVM: PPC: Book3S HV: Fix computation of tlbie operand KVM: PPC: Book3S HV: Add missing HPTE unlock KVM: PPC: BookE: Improve irq inject tracepoint arm/arm64: KVM: Require in-kernel vgic for the arch timers ...
Diffstat (limited to 'arch/s390/mm/pgtable.c')
-rw-r--r--arch/s390/mm/pgtable.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 71c7eff..be99357 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -844,7 +844,7 @@ int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
down_read(&mm->mmap_sem);
retry:
- ptep = get_locked_pte(current->mm, addr, &ptl);
+ ptep = get_locked_pte(mm, addr, &ptl);
if (unlikely(!ptep)) {
up_read(&mm->mmap_sem);
return -EFAULT;
@@ -888,6 +888,45 @@ retry:
}
EXPORT_SYMBOL(set_guest_storage_key);
+unsigned long get_guest_storage_key(struct mm_struct *mm, unsigned long addr)
+{
+ spinlock_t *ptl;
+ pgste_t pgste;
+ pte_t *ptep;
+ uint64_t physaddr;
+ unsigned long key = 0;
+
+ down_read(&mm->mmap_sem);
+ ptep = get_locked_pte(mm, addr, &ptl);
+ if (unlikely(!ptep)) {
+ up_read(&mm->mmap_sem);
+ return -EFAULT;
+ }
+ pgste = pgste_get_lock(ptep);
+
+ if (pte_val(*ptep) & _PAGE_INVALID) {
+ key |= (pgste_val(pgste) & PGSTE_ACC_BITS) >> 56;
+ key |= (pgste_val(pgste) & PGSTE_FP_BIT) >> 56;
+ key |= (pgste_val(pgste) & PGSTE_GR_BIT) >> 48;
+ key |= (pgste_val(pgste) & PGSTE_GC_BIT) >> 48;
+ } else {
+ physaddr = pte_val(*ptep) & PAGE_MASK;
+ key = page_get_storage_key(physaddr);
+
+ /* Reflect guest's logical view, not physical */
+ if (pgste_val(pgste) & PGSTE_GR_BIT)
+ key |= _PAGE_REFERENCED;
+ if (pgste_val(pgste) & PGSTE_GC_BIT)
+ key |= _PAGE_CHANGED;
+ }
+
+ pgste_set_unlock(ptep, pgste);
+ pte_unmap_unlock(ptep, ptl);
+ up_read(&mm->mmap_sem);
+ return key;
+}
+EXPORT_SYMBOL(get_guest_storage_key);
+
#else /* CONFIG_PGSTE */
static inline int page_table_with_pgste(struct page *page)
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