diff options
| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2011-03-09 15:41:04 +0800 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-03-17 13:08:34 -0300 |
| commit | 40dcaa9f69fa303ddcb5ea65baf4efefed3aec4b (patch) | |
| tree | d5c4d15fbbdb786c156e8f23afe1e025ab156c49 /arch | |
| parent | 1aa8ceef0312a6aae7dd863a120a55f1637b361d (diff) | |
| download | linux-40dcaa9f69fa303ddcb5ea65baf4efefed3aec4b.tar.bz2 | |
KVM: fix rcu usage in init_rmode_* functions
fix:
[ 3494.671786] stack backtrace:
[ 3494.671789] Pid: 10527, comm: qemu-system-x86 Not tainted 2.6.38-rc6+ #23
[ 3494.671790] Call Trace:
[ 3494.671796] [] ? lockdep_rcu_dereference+0x9d/0xa5
[ 3494.671826] [] ? kvm_memslots+0x6b/0x73 [kvm]
[ 3494.671834] [] ? gfn_to_memslot+0x16/0x4f [kvm]
[ 3494.671843] [] ? gfn_to_hva+0x16/0x27 [kvm]
[ 3494.671851] [] ? kvm_write_guest_page+0x31/0x83 [kvm]
[ 3494.671861] [] ? kvm_clear_guest_page+0x1a/0x1c [kvm]
[ 3494.671867] [] ? vmx_set_tss_addr+0x83/0x122 [kvm_intel]
and:
[ 8328.789599] stack backtrace:
[ 8328.789601] Pid: 18736, comm: qemu-system-x86 Not tainted 2.6.38-rc6+ #23
[ 8328.789603] Call Trace:
[ 8328.789609] [] ? lockdep_rcu_dereference+0x9d/0xa5
[ 8328.789621] [] ? kvm_memslots+0x6b/0x73 [kvm]
[ 8328.789628] [] ? gfn_to_memslot+0x16/0x4f [kvm]
[ 8328.789635] [] ? gfn_to_hva+0x16/0x27 [kvm]
[ 8328.789643] [] ? kvm_write_guest_page+0x31/0x83 [kvm]
[ 8328.789699] [] ? kvm_clear_guest_page+0x1a/0x1c [kvm]
[ 8328.789713] [] ? vmx_create_vcpu+0x316/0x3c8 [kvm_intel]
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 3febb763cb7f..d8475a26add6 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2397,11 +2397,12 @@ static bool guest_state_valid(struct kvm_vcpu *vcpu) static int init_rmode_tss(struct kvm *kvm) { - gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT; + gfn_t fn; u16 data = 0; - int ret = 0; - int r; + int r, idx, ret = 0; + idx = srcu_read_lock(&kvm->srcu); + fn = rmode_tss_base(kvm) >> PAGE_SHIFT; r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); if (r < 0) goto out; @@ -2425,12 +2426,13 @@ static int init_rmode_tss(struct kvm *kvm) ret = 1; out: + srcu_read_unlock(&kvm->srcu, idx); return ret; } static int init_rmode_identity_map(struct kvm *kvm) { - int i, r, ret; + int i, idx, r, ret; pfn_t identity_map_pfn; u32 tmp; @@ -2445,6 +2447,7 @@ static int init_rmode_identity_map(struct kvm *kvm) return 1; ret = 0; identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT; + idx = srcu_read_lock(&kvm->srcu); r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); if (r < 0) goto out; @@ -2460,6 +2463,7 @@ static int init_rmode_identity_map(struct kvm *kvm) kvm->arch.ept_identity_pagetable_done = true; ret = 1; out: + srcu_read_unlock(&kvm->srcu, idx); return ret; } |