From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 9/9] arm64: KVM: enable trapping of all debug registers
Date: Fri, 20 Jun 2014 14:00:07 +0100 [thread overview]
Message-ID: <1403269207-1625-10-git-send-email-marc.zyngier@arm.com> (raw)
In-Reply-To: <1403269207-1625-1-git-send-email-marc.zyngier@arm.com>
Enable trapping of the debug registers, preventing the guests to
mess with the host state (and allowing guests to use the debug
infrastructure as well).
Reviewed-by: Anup Patel <anup.patel@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm64/kvm/hyp.S | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S
index 727087c..e36ca91 100644
--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S
@@ -777,6 +777,14 @@ __kvm_hyp_code_start:
mrs x2, mdcr_el2
and x2, x2, #MDCR_EL2_HPMN_MASK
orr x2, x2, #(MDCR_EL2_TPM | MDCR_EL2_TPMCR)
+ orr x2, x2, #(MDCR_EL2_TDRA | MDCR_EL2_TDOSA)
+
+ // Check for KVM_ARM64_DEBUG_DIRTY, and set debug to trap
+ // if not dirty.
+ ldr x3, [x0, #VCPU_DEBUG_FLAGS]
+ tbnz x3, #KVM_ARM64_DEBUG_DIRTY_SHIFT, 1f
+ orr x2, x2, #MDCR_EL2_TDA
+1:
msr mdcr_el2, x2
.endm
--
1.8.3.4
prev parent reply other threads:[~2014-06-20 13:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-20 12:59 [PATCH v3 0/9] arm64: KVM: debug infrastructure support Marc Zyngier
2014-06-20 12:59 ` [PATCH v3 1/9] arm64: KVM: rename pm_fake handler to trap_raz_wi Marc Zyngier
2014-07-09 9:27 ` Christoffer Dall
2014-07-09 9:36 ` Marc Zyngier
2014-06-20 13:00 ` [PATCH v3 2/9] arm64: move DBG_MDSCR_* to asm/debug-monitors.h Marc Zyngier
2014-06-20 13:00 ` [PATCH v3 3/9] arm64: KVM: add trap handlers for AArch64 debug registers Marc Zyngier
2014-07-09 9:38 ` Christoffer Dall
2014-07-09 11:09 ` Marc Zyngier
2014-07-09 14:52 ` Christoffer Dall
2014-07-09 16:20 ` Marc Zyngier
2014-06-20 13:00 ` [PATCH v3 4/9] arm64: KVM: common infrastructure for handling AArch32 CP14/CP15 Marc Zyngier
2014-06-20 13:00 ` [PATCH v3 5/9] arm64: KVM: use separate tables for AArch32 32 and 64bit traps Marc Zyngier
2014-06-20 13:00 ` [PATCH v3 6/9] arm64: KVM: check ordering of all system register tables Marc Zyngier
2014-06-20 13:00 ` [PATCH v3 7/9] arm64: KVM: add trap handlers for AArch32 debug registers Marc Zyngier
2014-07-09 9:43 ` Christoffer Dall
2014-06-20 13:00 ` [PATCH v3 8/9] arm64: KVM: implement lazy world switch for " Marc Zyngier
2014-07-09 9:45 ` Christoffer Dall
2014-07-09 11:18 ` Marc Zyngier
2014-06-20 13:00 ` Marc Zyngier [this message]
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