diff options
| author | Avi Kivity <avi@redhat.com> | 2010-05-04 12:58:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-05 11:11:18 -0700 |
| commit | 4a277f9cb862ad44d3a83bfcc0cf42727de99ac3 (patch) | |
| tree | 87966cb19b527b6f8ce69e2d9a87e7d24162f2da /arch/x86 | |
| parent | 66307ba1647f9666baebd342520bf83cb7832468 (diff) | |
KVM: MMU: Don't read pdptrs with mmu spinlock held in mmu_alloc_roots
On svm, kvm_read_pdptr() may require reading guest memory, which can sleep.
Push the spinlock into mmu_alloc_roots(), and only take it after we've read
the pdptr.
Tested-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
(cherry picked from commit 8facbbff071ff2b19268d3732e31badc60471e21)
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index fd2b3af410a8..a2656266f999 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2091,11 +2091,13 @@ static int mmu_alloc_roots(struct kvm_vcpu *vcpu) direct = 1; if (mmu_check_root(vcpu, root_gfn)) return 1; + spin_lock(&vcpu->kvm->mmu_lock); sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL, direct, ACC_ALL, NULL); root = __pa(sp->spt); ++sp->root_count; + spin_unlock(&vcpu->kvm->mmu_lock); vcpu->arch.mmu.root_hpa = root; return 0; } @@ -2117,11 +2119,14 @@ static int mmu_alloc_roots(struct kvm_vcpu *vcpu) root_gfn = 0; if (mmu_check_root(vcpu, root_gfn)) return 1; + spin_lock(&vcpu->kvm->mmu_lock); sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, PT32_ROOT_LEVEL, direct, ACC_ALL, NULL); root = __pa(sp->spt); ++sp->root_count; + spin_unlock(&vcpu->kvm->mmu_lock); + vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; } vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); @@ -2485,7 +2490,9 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu) goto out; spin_lock(&vcpu->kvm->mmu_lock); kvm_mmu_free_some_pages(vcpu); + spin_unlock(&vcpu->kvm->mmu_lock); r = mmu_alloc_roots(vcpu); + spin_lock(&vcpu->kvm->mmu_lock); mmu_sync_roots(vcpu); spin_unlock(&vcpu->kvm->mmu_lock); if (r) |