linux-kernel - [PATCH 0/3] Handle MMIO during event delivery error on SVM

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Message-ID: <20240927161657.68110-1-iorlov@amazon.com>
Date: Fri, 27 Sep 2024 16:16:54 +0000
From: Ivan Orlov <iorlov@...zon.com>
To: <bp@...en8.de>, <dave.hansen@...ux.intel.com>, <mingo@...hat.com>,
	<pbonzini@...hat.com>, <seanjc@...gle.com>, <shuah@...nel.org>,
	<tglx@...utronix.de>
CC: Ivan Orlov <iorlov@...zon.com>, <hpa@...or.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
	<x86@...nel.org>, <jalliste@...zon.com>, <nh-open-source@...zon.com>,
	<pdurrant@...zon.co.uk>
Subject: [PATCH 0/3] Handle MMIO during event delivery error on SVM

Currently, the situation when guest accesses MMIO during event delivery
is handled differently in VMX and SVM: on VMX KVM returns internal error
with suberror = KVM_INTERNAL_ERROR_DELIVERY_EV, when SVM simply goes
into infinite loop trying to deliver an event again and again.

This patch series eliminates this difference by returning a KVM internal
error with suberror = KVM_INTERNAL_ERROR_DELIVERY_EV when guest is
performing MMIO during event delivery, for both VMX and SVM.

Also, it introduces a selftest test case which covers the MMIO during
event delivery error handling.

Ivan Orlov (3):
  KVM: x86, vmx: Add function for event delivery error generation
  KVM: vmx, svm, mmu: Process MMIO during event delivery
  selftests: KVM: Add test case for MMIO during event delivery

 arch/x86/include/asm/kvm_host.h               |  8 ++++
 arch/x86/kvm/mmu/mmu.c                        | 15 +++++-
 arch/x86/kvm/svm/svm.c                        |  4 ++
 arch/x86/kvm/vmx/vmx.c                        | 32 ++++---------
 arch/x86/kvm/x86.c                            | 22 +++++++++
 .../selftests/kvm/set_memory_region_test.c    | 46 +++++++++++++++++++
 6 files changed, 104 insertions(+), 23 deletions(-)

-- 
2.43.0