From: Dave Martin <Dave.Martin@arm.com>
Date: Tue, 31 Oct 2017 15:51:17 +0000
Subject: arm64/sve: KVM: Treat guest SVE use as undefined instruction
execution
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Patch-mainline: v4.15-rc1
Git-commit: aac45ffd1f8eff7b919df3deaa06d872b665eb09
References: bsc#1077761
When trapping forbidden attempts by a guest to use SVE, we want the
guest to see a trap consistent with SVE not being implemented.
This patch injects an undefined instruction exception into the
guest in response to such an exception.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Alexander Graf <agraf@suse.de>
---
arch/arm64/kvm/handle_exit.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c
@@ -147,6 +147,13 @@
return 1;
}
+static int handle_sve(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ /* Until SVE is supported for guests: */
+ kvm_inject_undefined(vcpu);
+ return 1;
+}
+
static exit_handle_fn arm_exit_handlers[] = {
[0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec,
[ESR_ELx_EC_WFx] = kvm_handle_wfx,
@@ -160,6 +167,7 @@
[ESR_ELx_EC_HVC64] = handle_hvc,
[ESR_ELx_EC_SMC64] = handle_smc,
[ESR_ELx_EC_SYS64] = kvm_handle_sys_reg,
+ [ESR_ELx_EC_SVE] = handle_sve,
[ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort,
[ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort,
[ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug,