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Merge git://git.kernel.org/pub/scm/virt/kvm/kvm

Browse source 
Pull kvm fixes from Marcelo Tosatti:
 "KVM bug fixes (ARM and x86)"

* git://git.kernel.org/pub/scm/virt/kvm/kvm:
  arm/arm64: KVM: Keep elrsr/aisr in sync with software model
  KVM: VMX: Set msr bitmap correctly if vcpu is in guest mode
  arm/arm64: KVM: fix missing unlock on error in kvm_vgic_create()
  kvm: x86: i8259: return initialized data on invalid-size read
  arm64: KVM: Fix outdated comment about VTCR_EL2.PS
  arm64: KVM: Do not use pgd_index to index stage-2 pgd
  arm64: KVM: Fix stage-2 PGD allocation to have per-page refcounting
  kvm: move advertising of KVM_CAP_IRQFD to common code
This commit is contained in:
Linus Torvalds 2015-03-17 10:31:36 -07:00
commit 2fc67756e3
13 changed files with 114 additions and 81 deletions
Download patch file Download diff file Expand all files Collapse all files

15
arch/arm/include/asm/kvm_mmu.h
View file

@ -149,31 +149,30 @@ static inline bool kvm_s2pmd_readonly(pmd_t *pmd)
(__boundary - 1 < (end) - 1)? __boundary: (end); \
})
#define kvm_pgd_index(addr) pgd_index(addr)
static inline bool kvm_page_empty(void *ptr)
{
struct page *ptr_page = virt_to_page(ptr);
return page_count(ptr_page) == 1;
}
#define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
#define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
#define kvm_pud_table_empty(kvm, pudp) (0)
#define KVM_PREALLOC_LEVEL 0
static inline int kvm_prealloc_hwpgd(struct kvm *kvm, pgd_t *pgd)
{
return 0;
}
static inline void kvm_free_hwpgd(struct kvm *kvm) { }
static inline void *kvm_get_hwpgd(struct kvm *kvm)
{
return kvm->arch.pgd;
}
static inline unsigned int kvm_get_hwpgd_size(void)
{
return PTRS_PER_S2_PGD * sizeof(pgd_t);
}
struct kvm;
#define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))

75
arch/arm/kvm/mmu.c
View file

@ -290,7 +290,7 @@ static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
phys_addr_t addr = start, end = start + size;
phys_addr_t next;
pgd = pgdp + pgd_index(addr);
pgd = pgdp + kvm_pgd_index(addr);
do {
next = kvm_pgd_addr_end(addr, end);
if (!pgd_none(*pgd))
@ -355,7 +355,7 @@ static void stage2_flush_memslot(struct kvm *kvm,
phys_addr_t next;
pgd_t *pgd;
pgd = kvm->arch.pgd + pgd_index(addr);
pgd = kvm->arch.pgd + kvm_pgd_index(addr);
do {
next = kvm_pgd_addr_end(addr, end);
stage2_flush_puds(kvm, pgd, addr, next);
@ -632,6 +632,20 @@ int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
__phys_to_pfn(phys_addr), PAGE_HYP_DEVICE);
}
/* Free the HW pgd, one page at a time */
static void kvm_free_hwpgd(void *hwpgd)
{
free_pages_exact(hwpgd, kvm_get_hwpgd_size());
}
/* Allocate the HW PGD, making sure that each page gets its own refcount */
static void *kvm_alloc_hwpgd(void)
{
unsigned int size = kvm_get_hwpgd_size();
return alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
}
/**
* kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation.
* @kvm: The KVM struct pointer for the VM.
@ -645,15 +659,31 @@ int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
*/
int kvm_alloc_stage2_pgd(struct kvm *kvm)
{
int ret;
pgd_t *pgd;
void *hwpgd;
if (kvm->arch.pgd != NULL) {
kvm_err("kvm_arch already initialized?\n");
return -EINVAL;
}
hwpgd = kvm_alloc_hwpgd();
if (!hwpgd)
return -ENOMEM;
/* When the kernel uses more levels of page tables than the
* guest, we allocate a fake PGD and pre-populate it to point
* to the next-level page table, which will be the real
* initial page table pointed to by the VTTBR.
*
* When KVM_PREALLOC_LEVEL==2, we allocate a single page for
* the PMD and the kernel will use folded pud.
* When KVM_PREALLOC_LEVEL==1, we allocate 2 consecutive PUD
* pages.
*/
if (KVM_PREALLOC_LEVEL > 0) {
int i;
/*
* Allocate fake pgd for the page table manipulation macros to
* work. This is not used by the hardware and we have no
@ -661,30 +691,32 @@ int kvm_alloc_stage2_pgd(struct kvm *kvm)
*/
pgd = (pgd_t *)kmalloc(PTRS_PER_S2_PGD * sizeof(pgd_t),
GFP_KERNEL | __GFP_ZERO);
if (!pgd) {
kvm_free_hwpgd(hwpgd);
return -ENOMEM;
}
/* Plug the HW PGD into the fake one. */
for (i = 0; i < PTRS_PER_S2_PGD; i++) {
if (KVM_PREALLOC_LEVEL == 1)
pgd_populate(NULL, pgd + i,
(pud_t *)hwpgd + i * PTRS_PER_PUD);
else if (KVM_PREALLOC_LEVEL == 2)
pud_populate(NULL, pud_offset(pgd, 0) + i,
(pmd_t *)hwpgd + i * PTRS_PER_PMD);
}
} else {
/*
* Allocate actual first-level Stage-2 page table used by the
* hardware for Stage-2 page table walks.
*/
pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, S2_PGD_ORDER);
pgd = (pgd_t *)hwpgd;
}
if (!pgd)
return -ENOMEM;
ret = kvm_prealloc_hwpgd(kvm, pgd);
if (ret)
goto out_err;
kvm_clean_pgd(pgd);
kvm->arch.pgd = pgd;
return 0;
out_err:
if (KVM_PREALLOC_LEVEL > 0)
kfree(pgd);
else
free_pages((unsigned long)pgd, S2_PGD_ORDER);
return ret;
}
/**
@ -785,11 +817,10 @@ void kvm_free_stage2_pgd(struct kvm *kvm)
return;
unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE);
kvm_free_hwpgd(kvm);
kvm_free_hwpgd(kvm_get_hwpgd(kvm));
if (KVM_PREALLOC_LEVEL > 0)
kfree(kvm->arch.pgd);
else
free_pages((unsigned long)kvm->arch.pgd, S2_PGD_ORDER);
kvm->arch.pgd = NULL;
}
@ -799,7 +830,7 @@ static pud_t *stage2_get_pud(struct kvm *kvm, struct kvm_mmu_memory_cache *cache
pgd_t *pgd;
pud_t *pud;
pgd = kvm->arch.pgd + pgd_index(addr);
pgd = kvm->arch.pgd + kvm_pgd_index(addr);
if (WARN_ON(pgd_none(*pgd))) {
if (!cache)
return NULL;
@ -1089,7 +1120,7 @@ static void stage2_wp_range(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
pgd_t *pgd;
phys_addr_t next;
pgd = kvm->arch.pgd + pgd_index(addr);
pgd = kvm->arch.pgd + kvm_pgd_index(addr);
do {
/*
* Release kvm_mmu_lock periodically if the memory region is