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[2003:d8:2f25:9c00:e2c7:6eb5:8a51:1c60]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-442eb85bb20sm186557675e9.0.2025.05.21.06.17.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 May 2025 06:17:28 -0700 (PDT) Message-ID: Date: Wed, 21 May 2025 15:17:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/5] kvm: arm64: New memslot flag to indicate cacheable mapping To: ankita@nvidia.com, jgg@nvidia.com, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, ryan.roberts@arm.com, shahuang@redhat.com, lpieralisi@kernel.org Cc: aniketa@nvidia.com, cjia@nvidia.com, kwankhede@nvidia.com, kjaju@nvidia.com, targupta@nvidia.com, vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com, jhubbard@nvidia.com, danw@nvidia.com, zhiw@nvidia.com, mochs@nvidia.com, udhoke@nvidia.com, dnigam@nvidia.com, alex.williamson@redhat.com, sebastianene@google.com, coltonlewis@google.com, kevin.tian@intel.com, yi.l.liu@intel.com, ardb@kernel.org, akpm@linux-foundation.org, gshan@redhat.com, linux-mm@kvack.org, ddutile@redhat.com, tabba@google.com, qperret@google.com, seanjc@google.com, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, maobibo@loongson.cn References: <20250518054754.5345-1-ankita@nvidia.com> <20250518054754.5345-4-ankita@nvidia.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 7C530120011 X-Rspam-User: X-Stat-Signature: y6qupx9kb4fq1ojprtbqfni7b45t14ei X-HE-Tag: 1747833474-696781 X-HE-Meta: U2FsdGVkX18fhOACokCocK+asYeX8joqRNGw6WgVCurew2NCTcTJFvkQf5AYPInr1OZSheKQawjchuAwEfbMG5qacONCbRogyDDptKUzLFnabbWxYTquRu3NmBQKUrGPGfbvwfq6kyURnE8qqMuY7WvuRpKsY5fyKYSSAYuefdeKVeNK0mICo0IUWx1Uoh0iRQAc6p5HaJdadnBdbw4hfKB2VVap34VcZ63y5pxLB5TxK50S/9L6ujCjaJuGJdbz/W/6lkVF0no4nrHADe7GjchZ+8tbAV/KrEaQ9WY25ZnlqB/8YQXgmtb0rLUBEvIa7RYC5vUIbwEILQIELJQHk6gWw/5k2eVkE5P3TGnx5hoQ1Ff6oYzwG9d+x23MqJZfKkoPD/vFirPFc0k6aIWpHg55T7IAY5ObFO53yQCHblmBo/SqGYZT2gVjwUUCxeKq9mxH5jwche4uz2uvbJ9H2dwnKv+1EBw2WW2ejaOLOor6KTsWsAjUbzPv5589u/W26ZNWFMP4a772GMxpJNxl5MAVn1CvOxnC6RTY8epyvCJ7zHU9gHZnABeadFwHJVOFqjCTA7KseJ9lb3qUfxCStl+w2//+zy3WEhsOYcxK1gT40vxXgM5C6A+O7u8G6Ly3d7TpSUXJ5g5ZowUQ0KSc/RnY3yPnRW+xV01wo/RwM/wSaW52VW7UXH8dLaXDar4mjsDHf7/YgzwY5inIqRzznEoB9bj8jg4I4LvjytsmZKOV15dZtY/c56d5sHwiFRBgCpJKPUIusm6naw4etT3qm6n0REbcEPCwDRkyDesj3FrUGEjkJGW4yUvqecbBHyqD6L+iphh/84WihkDMas0bFIGxZcjkkA6CT7VGk4PonvYNFyXdnqBug3rXL1dpc4wYt0ygPEmZx+MDTi1cNqh0vYxIPiyvTfFvf+1zPXGSe3pony09IpF0K1/s35yiocSrOoLEBMMY62GjJ4iRvwp ncz/7dwu kXHG9wnGKjZYpN80Mo+aLXrC+VdxexyGRb8pfMJFKqWOsFT1OyLOB2EjQyzkvSRIRj6iNCfr48AvNg/qBt2VV9qzuACdeTGr+WLXzKL2iEO9Fkayc+TvHw3NWqwSCnpjxLU/f7N2lIXBGGodSRlBiDi2IgUKv8AWb+sBpdyLoZgYViqL5M1MnZtJPEpcJFqNYPfqxUuZjqH115upx3cM4AIFFulDKkQMALchYBH1kaJ+V/kCaGJ9TNAuQQrlJjLPsE/0d6TgaSldEwP6SA1owrc7P4DcHFhb+uSxFPjD2N7ktc3ttPHil2v5i/5MRZ5+B/DapkoCG8gvu+Bk8MGg/hIcH7Od6th83F3GSM4lUbJWRLDRnPhsNs8y8nzT6Nj3niPj1FIrTteS50G0rGo7vyJuh+FVuYFntOQY3JuEc6+TLhTSNJdaVt4tADMNSON/gRjJr5UoJ3czrHLkyMxEuV96DFmW4EHmcBd9jfX5bzdGf0/xjAKDC8E4Ig6ZmSRXTFq4G X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 18.05.25 07:47, ankita@nvidia.com wrote: > From: Ankit Agrawal > > Introduce a new memslot flag KVM_MEM_ENABLE_CACHEABLE_PFNMAP > as a tool for userspace to indicate that it expects a particular > PFN range to be mapped cacheable. > > This will serve as a guide for the KVM to activate the code that > allows cacheable PFNMAP. > > CC: Oliver Upton > CC: Catalin Marinas > CC: Jason Gunthorpe > Suggested-by: Marc Zyngier > Signed-off-by: Ankit Agrawal > --- > include/uapi/linux/kvm.h | 1 + > virt/kvm/kvm_main.c | 6 ++++-- > 2 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index b6ae8ad8934b..9defefe7bdf0 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -51,6 +51,7 @@ struct kvm_userspace_memory_region2 { > #define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) > #define KVM_MEM_READONLY (1UL << 1) > #define KVM_MEM_GUEST_MEMFD (1UL << 2) > +#define KVM_MEM_ENABLE_CACHEABLE_PFNMAP (1UL << 3) > > /* for KVM_IRQ_LINE */ > struct kvm_irq_level { > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index e85b33a92624..a3e77fe57cc4 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -1524,12 +1524,14 @@ static void kvm_replace_memslot(struct kvm *kvm, > * only allows these. > */ > #define KVM_SET_USER_MEMORY_REGION_V1_FLAGS \ > - (KVM_MEM_LOG_DIRTY_PAGES | KVM_MEM_READONLY) > + (KVM_MEM_LOG_DIRTY_PAGES | KVM_MEM_READONLY | \ > + KVM_MEM_ENABLE_CACHEABLE_PFNMAP) > > static int check_memory_region_flags(struct kvm *kvm, > const struct kvm_userspace_memory_region2 *mem) > { > - u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; > + u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES | > + KVM_MEM_ENABLE_CACHEABLE_PFNMAP; Should we have some kind of kvm_arch_supports ... check? Because anybody else except arm64 will not respect this? -- Cheers, David / dhildenb