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| author | Dan Williams <dan.j.williams@intel.com> | 2019-03-11 22:37:55 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-03-11 22:37:55 +0300 |
| commit | 4083014e32699af04a8e6eaa4855b08dba36a47a (patch) | |
| tree | fa37f9f9691fe64ca8a3c0cdc0315dc12462e6e4 /arch/x86/kvm/x86.c | |
| parent | 6fd96ff557963de8e62842a0dc360a6e3610d2bb (diff) | |
| parent | 78153dd45e7e0596ba32b15d02bda08e1513111e (diff) | |
| download | linux-4083014e32699af04a8e6eaa4855b08dba36a47a.tar.xz | |
Merge branch 'for-5.1/nfit/ars' into libnvdimm-for-next
Merge several updates to the ARS implementation. Highlights include:
* Support retrieval of short-ARS results if the ARS state is "requires
continuation", and even if the "no_init_ars" module parameter is
specified.
* Allow busy-polling of the kernel ARS state by allowing root to reset
the exponential back-off timer.
* Filter potentially stale ARS results by tracking query-ARS relative to
the previous start-ARS.
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3d27206f6c01..e67ecf25e690 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5116,6 +5116,13 @@ int kvm_read_guest_virt(struct kvm_vcpu *vcpu, { u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; + /* + * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED + * is returned, but our callers are not ready for that and they blindly + * call kvm_inject_page_fault. Ensure that they at least do not leak + * uninitialized kernel stack memory into cr2 and error code. + */ + memset(exception, 0, sizeof(*exception)); return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception); } |