From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.11 04/23] KVM: arm64: Disable guest access to trace filter controls
Date: Thu, 15 Apr 2021 16:48:11 +0200 [thread overview]
Message-ID: <20210415144413.296653437@linuxfoundation.org> (raw)
In-Reply-To: <20210415144413.146131392@linuxfoundation.org>
From: Suzuki K Poulose <suzuki.poulose@arm.com>
[ Upstream commit a354a64d91eec3e0f8ef0eed575b480fd75b999c ]
Disable guest access to the Trace Filter control registers.
We do not advertise the Trace filter feature to the guest
(ID_AA64DFR0_EL1: TRACE_FILT is cleared) already, but the guest
can still access the TRFCR_EL1 unless we trap it.
This will also make sure that the guest cannot fiddle with
the filtering controls set by a nvhe host.
Cc: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210323120647.454211-3-suzuki.poulose@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm64/include/asm/kvm_arm.h | 1 +
arch/arm64/kvm/debug.c | 2 ++
2 files changed, 3 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 4e90c2debf70..94d4025acc0b 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -278,6 +278,7 @@
#define CPTR_EL2_DEFAULT CPTR_EL2_RES1
/* Hyp Debug Configuration Register bits */
+#define MDCR_EL2_TTRF (1 << 19)
#define MDCR_EL2_TPMS (1 << 14)
#define MDCR_EL2_E2PB_MASK (UL(0x3))
#define MDCR_EL2_E2PB_SHIFT (UL(12))
diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c
index 7a7e425616b5..dbc890511631 100644
--- a/arch/arm64/kvm/debug.c
+++ b/arch/arm64/kvm/debug.c
@@ -89,6 +89,7 @@ void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu)
* - Debug ROM Address (MDCR_EL2_TDRA)
* - OS related registers (MDCR_EL2_TDOSA)
* - Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB)
+ * - Self-hosted Trace Filter controls (MDCR_EL2_TTRF)
*
* Additionally, KVM only traps guest accesses to the debug registers if
* the guest is not actively using them (see the KVM_ARM64_DEBUG_DIRTY
@@ -112,6 +113,7 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu)
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_TTRF |
MDCR_EL2_TPMCR |
MDCR_EL2_TDRA |
MDCR_EL2_TDOSA);
--
2.30.2
next prev parent reply other threads:[~2021-04-15 15:15 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-15 14:48 [PATCH 5.11 00/23] 5.11.15-rc1 review Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 01/23] interconnect: core: fix error return code of icc_link_destroy() Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 02/23] gfs2: Flag a withdraw if init_threads() fails Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 03/23] KVM: arm64: Hide system instruction access to Trace registers Greg Kroah-Hartman
2021-04-15 14:48 ` Greg Kroah-Hartman [this message]
2021-04-15 14:48 ` [PATCH 5.11 05/23] drm/imx: imx-ldb: fix out of bounds array access warning Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 06/23] gfs2: report "already frozen/thawed" errors Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 07/23] ftrace: Check if pages were allocated before calling free_pages() Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 08/23] tools/kvm_stat: Add restart delay Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 09/23] drm/tegra: dc: Dont set PLL clock to 0Hz Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 10/23] gpu: host1x: Use different lock classes for each client Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 11/23] XArray: Fix splitting to non-zero orders Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 12/23] radix tree test suite: Fix compilation Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 13/23] block: only update parent bi_status when bio fail Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 14/23] radix tree test suite: Register the main thread with the RCU library Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 15/23] idr test suite: Take RCU read lock in idr_find_test_1 Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 16/23] idr test suite: Create anchor before launching throbber Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 17/23] null_blk: fix command timeout completion handling Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 18/23] io_uring: dont mark S_ISBLK async work as unbounded Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 19/23] riscv,entry: fix misaligned base for excp_vect_table Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 20/23] block: dont ignore REQ_NOWAIT for direct IO Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 21/23] netfilter: x_tables: fix compat match/target pad out-of-bound write Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 22/23] perf map: Tighten snprintf() string precision to pass gcc check on some 32-bit arches Greg Kroah-Hartman
2021-04-15 14:48 ` [PATCH 5.11 23/23] net: sfp: cope with SFPs that set both LOS normal and LOS inverted Greg Kroah-Hartman
2021-04-15 22:42 ` [PATCH 5.11 00/23] 5.11.15-rc1 review Shuah Khan
2021-04-16 1:02 ` Naresh Kamboju
2021-04-16 17:31 ` Fox Chen
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