diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-07-09 19:40:11 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-07-16 11:19:48 +0200 |
| commit | 0f0caa52cd4a48a44f6cdc77bf83272bbb450727 (patch) | |
| tree | 4469c3e72219f2716353be63aeab9a24889c1b04 /arch/x86/hyperv | |
| parent | 8f63e9230decb06ea9068feaf0845c0eb39ab890 (diff) | |
| download | linux-0-day-0f0caa52cd4a48a44f6cdc77bf83272bbb450727.tar.gz linux-0-day-0f0caa52cd4a48a44f6cdc77bf83272bbb450727.tar.xz | |
x86/hyper-v: Check cpumask_to_vpset() return value in hyperv_flush_tlb_others_ex()
Commit 1268ed0c474a ("x86/hyper-v: Fix the circular dependency in IPI
enlightenment") made cpumask_to_vpset() return '-1' when there is a CPU
with unknown VP index in the supplied set. This needs to be checked before
we pass 'nr_bank' to hypercall.
Fixes: 1268ed0c474a ("x86/hyper-v: Fix the circular dependency in IPI enlightenment")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>
Cc: devel@linuxdriverproject.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20180709174012.17429-2-vkuznets@redhat.com
Diffstat (limited to 'arch/x86/hyperv')
| -rw-r--r-- | arch/x86/hyperv/mmu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c index 0d90e515ec988..453d2355cd61d 100644 --- a/arch/x86/hyperv/mmu.c +++ b/arch/x86/hyperv/mmu.c @@ -186,6 +186,8 @@ static u64 hyperv_flush_tlb_others_ex(const struct cpumask *cpus, flush->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; nr_bank = cpumask_to_vpset(&(flush->hv_vp_set), cpus); + if (nr_bank < 0) + return U64_MAX; /* * We can flush not more than max_gvas with one hypercall. Flush the |