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authorWill Deacon <will.deacon@arm.com>2016-09-22 12:35:43 +0200
committerWill Deacon <will.deacon@arm.com>2017-02-02 19:33:01 +0100
commitf85279b4bd481a1a0697c1d2a8a5f15de216b120 (patch)
tree85ae5ff3b6cfae4ea9ef703d31cfd0a2e46e9983 /arch/arm64/kvm/debug.c
parentarm64: make use of for_each_node_by_type() (diff)
downloadlinux-f85279b4bd481a1a0697c1d2a8a5f15de216b120.tar.xz
linux-f85279b4bd481a1a0697c1d2a8a5f15de216b120.zip
arm64: KVM: Save/restore the host SPE state when entering/leaving a VM
The SPE buffer is virtually addressed, using the page tables of the CPU MMU. Unusually, this means that the EL0/1 page table may be live whilst we're executing at EL2 on non-VHE configurations. When VHE is in use, we can use the same property to profile the guest behind its back. This patch adds the relevant disabling and flushing code to KVM so that the host can make use of SPE without corrupting guest memory, and any attempts by a guest to use SPE will result in a trap. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Cc: Alex Bennée <alex.bennee@linaro.org> Cc: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kvm/debug.c')
-rw-r--r--arch/arm64/kvm/debug.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c
index 47e5f0feaee8..dbadfaf850a7 100644
--- a/arch/arm64/kvm/debug.c
+++ b/arch/arm64/kvm/debug.c
@@ -95,6 +95,7 @@ void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu)
* - Performance monitors (MDCR_EL2_TPM/MDCR_EL2_TPMCR)
* - Debug ROM Address (MDCR_EL2_TDRA)
* - OS related registers (MDCR_EL2_TDOSA)
+ * - Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB)
*
* Additionally, KVM only traps guest accesses to the debug registers if
* the guest is not actively using them (see the KVM_ARM64_DEBUG_DIRTY
@@ -110,8 +111,13 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu)
trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug);
+ /*
+ * This also clears MDCR_EL2_E2PB_MASK to disable guest access
+ * to the profiling buffer.
+ */
vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK;
vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM |
+ MDCR_EL2_TPMS |
MDCR_EL2_TPMCR |
MDCR_EL2_TDRA |
MDCR_EL2_TDOSA);