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arm-autonomy/linux-arm-autonomy: apply runstate fix to kernels older than 5.10

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The patch introduced in 82ffc86 is a backport from the 5.10 version. Hence,
just apply it for kernels older than 5.10.

Change-Id: I6f442f540913b5e24bea533a436b4a3104d098e9
Issue-Id: SCM-2033
Signed-off-by: Diego Sueiro <diego.sueiro@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>
This commit is contained in:
Diego Sueiro
2021-01-11 15:08:43 +00:00
committed by Jon Mason
parent 75c9cc3bf8
commit 1f548fce10
3 changed files with 10 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta-arm-autonomy/recipes-kernel/linux/files/0001-xen-arm-do-not-setup-the-runstate-info-page-if-kpti-.patch
+83
View File
@@ -0,0 +1,83 @@
From f88af7229f6f22ce7313c11a0bbb9c88317b7c5e Mon Sep 17 00:00:00 2001
Message-Id: <f88af7229f6f22ce7313c11a0bbb9c88317b7c5e.1602759709.git.diego.sueiro@arm.com>
From: Stefano Stabellini <stefano.stabellini@xilinx.com>
Date: Thu, 24 Sep 2020 16:49:55 -0700
Subject: [PATCH] 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>
Upstream-Status: Backport
Signed-off-by: Diego Sueiro <diego.sueiro@arm.com>
---
arch/arm/include/asm/xen/page.h | 5 +++++
arch/arm/xen/enlighten.c | 6 ++++--
arch/arm64/include/asm/xen/page.h | 6 ++++++
3 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index 31bbc80..dc7f6e9 100644
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -1 +1,6 @@
#include <xen/arm/page.h>
+
+static inline bool xen_kernel_unmapped_at_usr(void)
+{
+ return false;
+}
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index e93145d..ea76562 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);
diff --git a/arch/arm64/include/asm/xen/page.h b/arch/arm64/include/asm/xen/page.h
index 31bbc80..dffdc77 100644
--- a/arch/arm64/include/asm/xen/page.h
+++ b/arch/arm64/include/asm/xen/page.h
@@ -1 +1,7 @@
#include <xen/arm/page.h>
+#include <asm/mmu.h>
+
+static inline bool xen_kernel_unmapped_at_usr(void)
+{
+ return arm64_kernel_unmapped_at_el0();
+}
--
2.7.4