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First round of KVM/ARM Fixes for 3.15

Browse source 
Includes vgic fixes, a possible kernel corruption bug due to
 misalignment of pages and disabling of KVM in KConfig on big-endian
 systems, because the last one breaks the build.
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Merge tag 'kvm-arm-for-3.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-master

First round of KVM/ARM Fixes for 3.15

Includes vgic fixes, a possible kernel corruption bug due to
misalignment of pages and disabling of KVM in KConfig on big-endian
systems, because the last one breaks the build.
This commit is contained in:
Paolo Bonzini 2014-04-30 21:25:09 +02:00
commit a5a5aef451
3 changed files with 18 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/arm/kvm/Kconfig
View file

@ -23,7 +23,7 @@ config KVM
select HAVE_KVM_CPU_RELAX_INTERCEPT
select KVM_MMIO
select KVM_ARM_HOST
depends on ARM_VIRT_EXT && ARM_LPAE
depends on ARM_VIRT_EXT && ARM_LPAE && !CPU_BIG_ENDIAN
---help---
Support hosting virtualized guest machines. You will also
need to select one or more of the processor modules below.

15
arch/arm/kvm/mmu.c
View file

@ -42,6 +42,8 @@ static unsigned long hyp_idmap_start;
static unsigned long hyp_idmap_end;
static phys_addr_t hyp_idmap_vector;
#define pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t))
#define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x))
static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
@ -293,14 +295,14 @@ void free_boot_hyp_pgd(void)
if (boot_hyp_pgd) {
unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
kfree(boot_hyp_pgd);
free_pages((unsigned long)boot_hyp_pgd, pgd_order);
boot_hyp_pgd = NULL;
}
if (hyp_pgd)
unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
kfree(init_bounce_page);
free_page((unsigned long)init_bounce_page);
init_bounce_page = NULL;
mutex_unlock(&kvm_hyp_pgd_mutex);
@ -330,7 +332,7 @@ void free_hyp_pgds(void)
for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
kfree(hyp_pgd);
free_pages((unsigned long)hyp_pgd, pgd_order);
hyp_pgd = NULL;
}
@ -1024,7 +1026,7 @@ int kvm_mmu_init(void)
size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
phys_addr_t phys_base;
init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
init_bounce_page = (void *)__get_free_page(GFP_KERNEL);
if (!init_bounce_page) {
kvm_err("Couldn't allocate HYP init bounce page\n");
err = -ENOMEM;
@ -1050,8 +1052,9 @@ int kvm_mmu_init(void)
(unsigned long)phys_base);
}
hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, pgd_order);
boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, pgd_order);
if (!hyp_pgd || !boot_hyp_pgd) {
kvm_err("Hyp mode PGD not allocated\n");
err = -ENOMEM;

15
virt/kvm/arm/vgic.c
View file

@ -548,11 +548,10 @@ static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
u32 val;
u32 *reg;
offset >>= 1;
reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
vcpu->vcpu_id, offset);
vcpu->vcpu_id, offset >> 1);
if (offset & 2)
if (offset & 4)
val = *reg >> 16;
else
val = *reg & 0xffff;
@ -561,13 +560,13 @@ static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
vgic_reg_access(mmio, &val, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
if (mmio->is_write) {
if (offset < 4) {
if (offset < 8) {
*reg = ~0U; /* Force PPIs/SGIs to 1 */
return false;
}
val = vgic_cfg_compress(val);
if (offset & 2) {
if (offset & 4) {
*reg &= 0xffff;
*reg |= val << 16;
} else {
@ -916,6 +915,7 @@ static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg)
case 0:
if (!target_cpus)
return;
break;
case 1:
target_cpus = ((1 << nrcpus) - 1) & ~(1 << vcpu_id) & 0xff;
@ -1667,10 +1667,11 @@ static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
if (addr + size < addr)
return -EINVAL;
*ioaddr = addr;
ret = vgic_ioaddr_overlap(kvm);
if (ret)
return ret;
*ioaddr = addr;
*ioaddr = VGIC_ADDR_UNDEF;
return ret;
}