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Commit a27fb6d9 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm 

Paolo writes:
  "It's mostly small bugfixes and cleanups, mostly around x86 nested
   virtualization.  One important change, not related to nested
   virtualization, is that the ability for the guest kernel to trap
   CPUID instructions (in Linux that's the ARCH_SET_CPUID arch_prctl) is
   now masked by default.  This is because the feature is detected
   through an MSR; a very bad idea that Intel seems to like more and
   more.  Some applications choke if the other fields of that MSR are
   not initialized as on real hardware, hence we have to disable the
   whole MSR by default, as was the case before Linux 4.12."

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (23 commits)
  KVM: nVMX: Fix bad cleanup on error of get/set nested state IOCTLs
  kvm: selftests: Add platform_info_test
  KVM: x86: Control guest reads of MSR_PLATFORM_INFO
  KVM: x86: Turbo bits in MSR_PLATFORM_INFO
  nVMX x86: Check VPID value on vmentry of L2 guests
  nVMX x86: check posted-interrupt descriptor addresss on vmentry of L2
  KVM: nVMX: Wake blocked vCPU in guest-mode if pending interrupt in virtual APICv
  KVM: VMX: check nested state and CR4.VMXE against SMM
  kvm: x86: make kvm_{load|put}_guest_fpu() static
  x86/hyper-v: rename ipi_arg_{ex,non_ex} structures
  KVM: VMX: use preemption timer to force immediate VMExit
  KVM: VMX: modify preemption timer bit only when arming timer
  KVM: VMX: immediately mark preemption timer expired only for zero value
  KVM: SVM: Switch to bitmap_zalloc()
  KVM/MMU: Fix comment in walk_shadow_page_lockless_end()
  kvm: selftests: use -pthread instead of -lpthread
  KVM: x86: don't reset root in kvm_mmu_setup()
  kvm: mmu: Don't read PDPTEs when paging is not enabled
  x86/kvm/lapic: always disable MMIO interface in x2APIC mode
  KVM: s390: Make huge pages unavailable in ucontrol VMs
  ...
parents 0eba8697 26b471c7

Documentation/virtual/kvm/api.txt

+11 −1
Original line number Diff line number Diff line
@@ -4510,7 +4510,8 @@ Do not enable KVM_FEATURE_PV_UNHALT if you disable HLT exits. 
Architectures: s390

Parameters: none

Returns: 0 on success, -EINVAL if hpage module parameter was not set

	 or cmma is enabled

	 or cmma is enabled, or the VM has the KVM_VM_S390_UCONTROL

	 flag set



With this capability the KVM support for memory backing with 1m pages

through hugetlbfs can be enabled for a VM. After the capability is
@@ -4521,6 +4522,15 @@ hpage module parameter is not set to 1, -EINVAL is returned. 
While it is generally possible to create a huge page backed VM without

this capability, the VM will not be able to run.



7.14 KVM_CAP_MSR_PLATFORM_INFO



Architectures: x86

Parameters: args[0] whether feature should be enabled or not



With this capability, a guest may read the MSR_PLATFORM_INFO MSR. Otherwise,

a #GP would be raised when the guest tries to access. Currently, this

capability does not enable write permissions of this MSR for the guest.



8. Other capabilities.

----------------------

arch/powerpc/include/asm/book3s/64/pgtable.h

+0 −1
Original line number Diff line number Diff line
@@ -1051,7 +1051,6 @@ static inline void vmemmap_remove_mapping(unsigned long start, 
	return hash__vmemmap_remove_mapping(start, page_size);

}

#endif

struct page *realmode_pfn_to_page(unsigned long pfn);



static inline pte_t pmd_pte(pmd_t pmd)

{

arch/powerpc/include/asm/iommu.h

+0 −2
Original line number Diff line number Diff line
@@ -220,8 +220,6 @@ extern void iommu_del_device(struct device *dev); 
extern int __init tce_iommu_bus_notifier_init(void);

extern long iommu_tce_xchg(struct iommu_table *tbl, unsigned long entry,

		unsigned long *hpa, enum dma_data_direction *direction);

extern long iommu_tce_xchg_rm(struct iommu_table *tbl, unsigned long entry,

		unsigned long *hpa, enum dma_data_direction *direction);

#else

static inline void iommu_register_group(struct iommu_table_group *table_group,

					int pci_domain_number,

arch/powerpc/include/asm/mmu_context.h

+1 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 
		unsigned long ua, unsigned int pageshift, unsigned long *hpa);

extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,

		unsigned long ua, unsigned int pageshift, unsigned long *hpa);

extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua);

extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);

extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);

#endif

arch/powerpc/kernel/iommu.c

+0 −25
Original line number Diff line number Diff line
@@ -1013,31 +1013,6 @@ long iommu_tce_xchg(struct iommu_table *tbl, unsigned long entry, 
}

EXPORT_SYMBOL_GPL(iommu_tce_xchg);



#ifdef CONFIG_PPC_BOOK3S_64

long iommu_tce_xchg_rm(struct iommu_table *tbl, unsigned long entry,

		unsigned long *hpa, enum dma_data_direction *direction)

{

	long ret;



	ret = tbl->it_ops->exchange_rm(tbl, entry, hpa, direction);



	if (!ret && ((*direction == DMA_FROM_DEVICE) ||

			(*direction == DMA_BIDIRECTIONAL))) {

		struct page *pg = realmode_pfn_to_page(*hpa >> PAGE_SHIFT);



		if (likely(pg)) {

			SetPageDirty(pg);

		} else {

			tbl->it_ops->exchange_rm(tbl, entry, hpa, direction);

			ret = -EFAULT;

		}

	}



	return ret;

}

EXPORT_SYMBOL_GPL(iommu_tce_xchg_rm);

#endif



int iommu_take_ownership(struct iommu_table *tbl)

{

	unsigned long flags, i, sz = (tbl->it_size + 7) >> 3;