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authorMarc Zyngier <marc.zyngier@arm.com>2017-03-27 17:03:40 +0100
committerChristoffer Dall <cdall@linaro.org>2017-04-09 07:49:14 -0700
commit7b5b4df1a79954e0b208630fc63b16ec0231a516 (patch)
tree3fba4ba68bdf72da6756e7f5523251ebfd73cd46 /arch/arm64/kvm/sys_regs.c
parentarm64: KVM: PMU: Inject UNDEF on non-privileged accesses (diff)
downloadlinux-dev-7b5b4df1a79954e0b208630fc63b16ec0231a516.tar.xz
linux-dev-7b5b4df1a79954e0b208630fc63b16ec0231a516.zip
arm64: KVM: Make unexpected reads from WO registers inject an undef
Reads from write-only system registers are generally confined to EL1 and not propagated to EL2 (that's what the architecture mantates). In order to be sure that we have a sane behaviour even in the unlikely event that we have a broken system, we still handle it in KVM. In that case, let's inject an undef into the guest. Let's also remove write_to_read_only which isn't used anywhere. Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to '')
-rw-r--r--arch/arm64/kvm/sys_regs.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index d343c0febdd6..20f90c01af33 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -55,6 +55,15 @@
* 64bit interface.
*/
+static bool read_from_write_only(struct kvm_vcpu *vcpu,
+ const struct sys_reg_params *params)
+{
+ WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n");
+ print_sys_reg_instr(params);
+ kvm_inject_undefined(vcpu);
+ return false;
+}
+
/* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */
static u32 cache_levels;