This is a note to let you know that I've just added the patch titled
arm64: KVM: allows discrimination of AArch32 sysreg access
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-kvm-allows-discrimination-of-aarch32-sysreg-access.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2072d29c46b73e39b3c6c56c6027af77086f45fd Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@xxxxxxx>
Date: Tue, 21 Jan 2014 10:55:17 +0000
Subject: arm64: KVM: allows discrimination of AArch32 sysreg access
From: Marc Zyngier <marc.zyngier@xxxxxxx>
commit 2072d29c46b73e39b3c6c56c6027af77086f45fd upstream.
The current handling of AArch32 trapping is slightly less than
perfect, as it is not possible (from a handler point of view)
to distinguish it from an AArch64 access, nor to tell a 32bit
from a 64bit access either.
Fix this by introducing two additional flags:
- is_aarch32: true if the access was made in AArch32 mode
- is_32bit: true if is_aarch32 == true and a MCR/MRC instruction
was used to perform the access (as opposed to MCRR/MRRC).
This allows a handler to cover all the possible conditions in which
a system register gets trapped.
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Acked-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
Cc: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 6 ++++++
arch/arm64/kvm/sys_regs.h | 2 ++
2 files changed, 8 insertions(+)
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -437,6 +437,8 @@ int kvm_handle_cp15_64(struct kvm_vcpu *
u32 hsr = kvm_vcpu_get_hsr(vcpu);
int Rt2 = (hsr >> 10) & 0xf;
+ params.is_aarch32 = true;
+ params.is_32bit = false;
params.CRm = (hsr >> 1) & 0xf;
params.Rt = (hsr >> 5) & 0xf;
params.is_write = ((hsr & 1) == 0);
@@ -480,6 +482,8 @@ int kvm_handle_cp15_32(struct kvm_vcpu *
struct sys_reg_params params;
u32 hsr = kvm_vcpu_get_hsr(vcpu);
+ params.is_aarch32 = true;
+ params.is_32bit = true;
params.CRm = (hsr >> 1) & 0xf;
params.Rt = (hsr >> 5) & 0xf;
params.is_write = ((hsr & 1) == 0);
@@ -549,6 +553,8 @@ int kvm_handle_sys_reg(struct kvm_vcpu *
struct sys_reg_params params;
unsigned long esr = kvm_vcpu_get_hsr(vcpu);
+ params.is_aarch32 = false;
+ params.is_32bit = false;
params.Op0 = (esr >> 20) & 3;
params.Op1 = (esr >> 14) & 0x7;
params.CRn = (esr >> 10) & 0xf;
--- a/arch/arm64/kvm/sys_regs.h
+++ b/arch/arm64/kvm/sys_regs.h
@@ -30,6 +30,8 @@ struct sys_reg_params {
u8 Op2;
u8 Rt;
bool is_write;
+ bool is_aarch32;
+ bool is_32bit; /* Only valid if is_aarch32 is true */
};
struct sys_reg_desc {
Patches currently in stable-queue which might be from marc.zyngier@xxxxxxx are
queue-3.14/kvm-arm-arm64-vgic-fix-gicd_icfgr-register-accesses.patch
queue-3.14/arm-kvm-introduce-per-vcpu-hyp-configuration-register.patch
queue-3.14/arm-kvm-fix-handling-of-trapped-64bit-coprocessor-accesses.patch
queue-3.14/kvm-arm64-vgic-fix-hyp-panic-with-64k-pages-on-juno-platform.patch
queue-3.14/arm64-kvm-force-cache-clean-on-page-fault-when-caches-are-off.patch
queue-3.14/arm-kvm-introduce-kvm_p-d_addr_end.patch
queue-3.14/arm64-kvm-flush-vm-pages-before-letting-the-guest-enable-caches.patch
queue-3.14/arm-kvm-force-cache-clean-on-page-fault-when-caches-are-off.patch
queue-3.14/arm-kvm-add-world-switch-for-amair-0-1.patch
queue-3.14/kvm-arm-vgic-fix-the-overlap-check-action-about-setting-the-gicd-gicc-base-address.patch
queue-3.14/arm64-kvm-use-inner-shareable-barriers-for-inner-shareable-maintenance.patch
queue-3.14/arm64-kvm-allows-discrimination-of-aarch32-sysreg-access.patch
queue-3.14/arm-kvm-trap-vm-system-registers-until-mmu-and-caches-are-on.patch
queue-3.14/arm-kvm-fix-ordering-of-64bit-coprocessor-accesses.patch
queue-3.14/arm64-kvm-trap-vm-system-registers-until-mmu-and-caches-are-on.patch
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