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authorStefano Stabellini <stefano.stabellini@xilinx.com>2020-09-24 16:49:55 -0700
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2020-10-04 18:41:33 -0500
commitf88af7229f6f22ce7313c11a0bbb9c88317b7c5e (patch)
treef0bedc44b6b3350d498dd32817ae8a92592623ea /arch/arm/xen
parentbba91dd6d70b7aa239280dc095a461bc064c98a5 (diff)
downloadlinux-f88af7229f6f22ce7313c11a0bbb9c88317b7c5e.tar.bz2
xen/arm: do not setup the runstate info page if kpti is enabled
The VCPUOP_register_runstate_memory_area hypercall takes a virtual address of a buffer as a parameter. The semantics of the hypercall are such that the virtual address should always be valid. When KPTI is enabled and we are running userspace code, the virtual address is not valid, thus, Linux is violating the semantics of VCPUOP_register_runstate_memory_area. Do not call VCPUOP_register_runstate_memory_area when KPTI is enabled. Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com> CC: Bertrand Marquis <Bertrand.Marquis@arm.com> CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Link: https://lore.kernel.org/r/20200924234955.15455-1-sstabellini@kernel.org Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'arch/arm/xen')
-rw-r--r--arch/arm/xen/enlighten.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index e93145d72c26..ea76562af1e9 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -158,7 +158,8 @@ static int xen_starting_cpu(unsigned int cpu)
BUG_ON(err);
per_cpu(xen_vcpu, cpu) = vcpup;
- xen_setup_runstate_info(cpu);
+ if (!xen_kernel_unmapped_at_usr())
+ xen_setup_runstate_info(cpu);
after_register_vcpu_info:
enable_percpu_irq(xen_events_irq, 0);
@@ -387,7 +388,8 @@ static int __init xen_guest_init(void)
return -EINVAL;
}
- xen_time_setup_guest();
+ if (!xen_kernel_unmapped_at_usr())
+ xen_time_setup_guest();
if (xen_initial_domain())
pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);