From: Nicholas Piggin <npiggin@gmail.com>
To: Thomas Huth <thuth@redhat.com>
Cc: Nicholas Piggin <npiggin@gmail.com>,
Laurent Vivier <lvivier@redhat.com>,
Andrew Jones <andrew.jones@linux.dev>,
linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org
Subject: [kvm-unit-tests PATCH v9 06/31] powerpc/sprs: Avoid taking PMU interrupts caused by register fuzzing
Date: Sat, 4 May 2024 22:28:12 +1000 [thread overview]
Message-ID: <20240504122841.1177683-7-npiggin@gmail.com> (raw)
In-Reply-To: <20240504122841.1177683-1-npiggin@gmail.com>
Storing certain values in MMCR0 can cause PMU interrupts when msleep
enables MSR[EE], and this crashes the test. Freeze the PMU counters
and clear any PMU exception before calling msleep.
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
lib/powerpc/asm/reg.h | 4 ++++
powerpc/sprs.c | 17 +++++++++++------
2 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/lib/powerpc/asm/reg.h b/lib/powerpc/asm/reg.h
index 1f991288e..c80b32059 100644
--- a/lib/powerpc/asm/reg.h
+++ b/lib/powerpc/asm/reg.h
@@ -24,6 +24,10 @@
#define PVR_VER_POWER10 UL(0x00800000)
#define SPR_HSRR0 0x13a
#define SPR_HSRR1 0x13b
+#define SPR_MMCR0 0x31b
+#define MMCR0_FC UL(0x80000000)
+#define MMCR0_PMAE UL(0x04000000)
+#define MMCR0_PMAO UL(0x00000080)
/* Machine State Register definitions: */
#define MSR_EE_BIT 15 /* External Interrupts Enable */
diff --git a/powerpc/sprs.c b/powerpc/sprs.c
index a6588ca63..c25dac1f6 100644
--- a/powerpc/sprs.c
+++ b/powerpc/sprs.c
@@ -476,12 +476,7 @@ static void set_sprs(uint64_t val)
continue;
if (sprs[i].type & SPR_HARNESS)
continue;
- if (!strcmp(sprs[i].name, "MMCR0")) {
- /* XXX: could use a comment or better abstraction! */
- __mtspr(i, (val & 0xfffffffffbab3fffULL) | 0xfa0b2070);
- } else {
- __mtspr(i, val);
- }
+ __mtspr(i, val);
}
}
@@ -538,6 +533,16 @@ int main(int argc, char **argv)
if (sprs[895].name)
before[895] = mfspr(895);
} else {
+ /*
+ * msleep will enable MSR[EE] and take a decrementer
+ * interrupt. Must account for changed registers and
+ * prevent taking unhandled interrupts.
+ */
+ /* Prevent PMU interrupt */
+ mtspr(SPR_MMCR0, (mfspr(SPR_MMCR0) | MMCR0_FC) &
+ ~(MMCR0_PMAO | MMCR0_PMAE));
+ before[SPR_MMCR0] = mfspr(SPR_MMCR0);
+ before[779] = mfspr(SPR_MMCR0);
msleep(2000);
/* Reload regs changed by dec interrupt */
--
2.43.0
next prev parent reply other threads:[~2024-05-04 12:29 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-04 12:28 [kvm-unit-tests PATCH v9 00/31] powerpc improvements Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 01/31] doc: update unittests doc Nicholas Piggin
2024-05-06 7:03 ` Thomas Huth
2024-05-07 3:57 ` Nicholas Piggin
2024-05-06 8:02 ` Andrew Jones
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 02/31] report: Add known failure reporting option Nicholas Piggin
2024-05-06 7:25 ` Thomas Huth
2024-05-06 8:01 ` Andrew Jones
2024-05-06 10:19 ` Thomas Huth
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 03/31] powerpc: Mark known failing tests as kfail Nicholas Piggin
2024-05-06 7:37 ` Thomas Huth
2024-05-07 4:07 ` Nicholas Piggin
2024-05-07 11:44 ` Thomas Huth
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 04/31] powerpc: Update unittests for latest QEMU version Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 05/31] powerpc/sprs: Specify SPRs with data rather than code Nicholas Piggin
2024-05-04 12:28 ` Nicholas Piggin [this message]
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 07/31] scripts: allow machine option to be specified in unittests.cfg Nicholas Piggin
2024-05-07 15:08 ` Thomas Huth
2024-05-08 12:27 ` Nicholas Piggin
2024-05-08 12:55 ` Thomas Huth
2024-05-08 12:58 ` Thomas Huth
2024-05-08 13:36 ` Thomas Huth
2024-05-09 5:44 ` Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 08/31] scripts: Accommodate powerpc powernv machine differences Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 09/31] powerpc: Support powernv machine with QEMU TCG Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 10/31] powerpc: Fix emulator illegal instruction test for powernv Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 11/31] powerpc/sprs: Test hypervisor registers on powernv machine Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 12/31] powerpc: general interrupt tests Nicholas Piggin
2024-05-07 12:12 ` Thomas Huth
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 13/31] powerpc: Add rtas stop-self support Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 14/31] powerpc: Remove broken SMP exception stack setup Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 15/31] powerpc: Enable page alloc operations Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 16/31] powerpc: add SMP and IPI support Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 17/31] powerpc: Add cpu_relax Nicholas Piggin
2024-05-07 13:44 ` Thomas Huth
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 18/31] powerpc: Permit ACCEL=tcg,thread=single Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 19/31] powerpc: Avoid using larx/stcx. in spinlocks when only one CPU is running Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 20/31] powerpc: Add atomics tests Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 21/31] powerpc: Add timebase tests Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 22/31] powerpc: Add MMU support Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 23/31] common/sieve: Use vmalloc.h for setup_mmu definition Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 24/31] common/sieve: Support machines without MMU Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 25/31] powerpc: Add sieve.c common test Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 26/31] powerpc: add usermode support Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 27/31] powerpc: add pmu tests Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 28/31] configure: Make arch_libdir a first-class entity Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 29/31] powerpc: Remove remnants of ppc64 directory and build structure Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 30/31] powerpc: Add facility to query TCG or KVM host Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 31/31] powerpc: gitlab CI update Nicholas Piggin
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