[PATCH 2/2] ptp: Fix ptp_kvm_getcrosststamp issue for x86 ptp_kvm

[Zelin Deng <zelin.deng@linux.alibaba.com>]

If PTP_SYS_OFFSET_PRECISE ioctl is executed on vCPU >= 64, struct
pvclock_vcpu_time_info *src which is got by "src = &hv_clock[cpu].pvti"
could be wild/dangling pointer, as hv_clock arrary has only
HVC_BOOT_ARRAY_SIZE (64) elements.
Therefore let's change it to "this_cpu_pvti()"

Fixes: 95a3d4454bb1 ("Switch kvmclock data to a PER_CPU variable")
Signed-off-by: Zelin Deng <zelin.deng@linux.alibaba.com>
Cc: <stable@vger.kernel.org>
---
 drivers/ptp/ptp_kvm_x86.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/ptp/ptp_kvm_x86.c b/drivers/ptp/ptp_kvm_x86.c
index 3dd519d..d0096cd 100644
--- a/drivers/ptp/ptp_kvm_x86.c
+++ b/drivers/ptp/ptp_kvm_x86.c
@@ -15,8 +15,6 @@
 #include <linux/ptp_clock_kernel.h>
 #include <linux/ptp_kvm.h>
 
-struct pvclock_vsyscall_time_info *hv_clock;
-
 static phys_addr_t clock_pair_gpa;
 static struct kvm_clock_pairing clock_pair;
 
@@ -28,8 +26,7 @@ int kvm_arch_ptp_init(void)
 		return -ENODEV;
 
 	clock_pair_gpa = slow_virt_to_phys(&clock_pair);
-	hv_clock = pvclock_get_pvti_cpu0_va();
-	if (!hv_clock)
+	if (!pvclock_get_pvti_cpu0_va())
 		return -ENODEV;
 
 	ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING, clock_pair_gpa,
@@ -64,10 +61,8 @@ int kvm_arch_ptp_get_crosststamp(u64 *cycle, struct timespec64 *tspec,
 	struct pvclock_vcpu_time_info *src;
 	unsigned int version;
 	long ret;
-	int cpu;
 
-	cpu = smp_processor_id();
-	src = &hv_clock[cpu].pvti;
+	src = this_cpu_pvti();
 
 	do {
 		/*
-- 
1.8.3.1