linux-kernel - [PATCH] KVM: arm64: Ratelimit error log during guest debug exception

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Message-Id: <20210819223406.1132426-1-rananta@google.com>
Date:   Thu, 19 Aug 2021 22:34:06 +0000
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Marc Zyngier <maz@...nel.org>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Raghavendra Rao Anata <rananta@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: arm64: Ratelimit error log during guest debug exception

Potentially, the guests could trigger a debug exception that's
outside the exception class range. This could lead to an
excessive syslog flooding. Hence, ratelimit the error message.

Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
---
 arch/arm64/kvm/handle_exit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index 04ebab299aa4..c7cec7ffe93c 100644
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c
@@ -134,7 +134,7 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu)
 	case ESR_ELx_EC_BRK64:
 		break;
 	default:
-		kvm_err("%s: un-handled case esr: %#08x\n",
+		kvm_pr_unimpl("%s: un-handled case esr: %#08x\n",
 			__func__, (unsigned int) esr);
 		ret = -1;
 		break;
-- 
2.33.0.rc2.250.ged5fa647cd-goog