[PATCH 10/10] KVM: arm: enable trapping of all debug registers
From: Zhichao Huang <hidden>
Date: 2015-05-16 04:45:51
Also in:
kvm, kvmarm
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Enable trapping of the debug registers, allowing guests to use the debug infrastructure. Signed-off-by: Zhichao Huang <redacted> --- arch/arm/kvm/interrupts_head.S | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/arm/kvm/interrupts_head.S b/arch/arm/kvm/interrupts_head.S
index ed406be..107bda4 100644
--- a/arch/arm/kvm/interrupts_head.S
+++ b/arch/arm/kvm/interrupts_head.S@@ -886,10 +886,21 @@ ARM_BE8(rev r6, r6 ) .endm /* Configures the HDCR (Hyp Debug Configuration Register) on entry/return - * (hardware reset value is 0) */ + * (hardware reset value is 0) + * + * Clobbers r2-r4 + */ .macro set_hdcr operation mrc p15, 4, r2, c1, c1, 1 - ldr r3, =(HDCR_TPM|HDCR_TPMCR) + ldr r3, =(HDCR_TPM|HDCR_TPMCR|HDCR_TDRA|HDCR_TDOSA) + + // Check for KVM_ARM_DEBUG_DIRTY, and set debug to trap + // if not dirty. + ldr r4, [vcpu, #VCPU_DEBUG_FLAGS] + cmp r4, #KVM_ARM_DEBUG_DIRTY + beq 1f + orr r3, r3, #HDCR_TDA +1: .if \operation == vmentry orr r2, r2, r3 @ Trap some perfmon accesses .else
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1.7.12.4