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[2003:d8:2f27:ec00:4f4d:d38:ba97:9aa2]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-451f9924a41sm31495085e9.40.2025.06.05.10.45.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Jun 2025 10:45:42 -0700 (PDT) Message-ID: <637ffae1-a61e-4d68-8332-9ec11a3a78d4@redhat.com> Date: Thu, 5 Jun 2025 19:45:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 12/18] KVM: x86: Enable guest_memfd shared memory for SW-protected VMs To: Fuad Tabba Cc: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, kvmarm@lists.linux.dev, pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com References: <20250605153800.557144-1-tabba@google.com> <20250605153800.557144-13-tabba@google.com> <4909d6dc-09f5-4960-b8be-5150b2a03e45@redhat.com> <8782284c-0ffc-489d-adfe-b25d5ccb77b3@redhat.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: rspam06 X-Rspamd-Queue-Id: 0B51740006 X-Stat-Signature: ugex9fhcrqmz97wk4179y1hcuy3q4pb5 X-Rspam-User: X-HE-Tag: 1749145546-157256 X-HE-Meta: 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 I7Ocgs4F 1sZT8HAlSvezUgsD2WaRSATf9GOzlioOAOI1CHHPVsdsA0dDfvkhuf73Nh6jiErWg+sk7TwWkzdkQcihX5PfhOMP4xDmISTmY7SriFuq7wNMoC77SP0gnMy3/x8uo98EpHTCxhyfGB2XixBsqfaxw7w9UhulFQ878CInFbSyeHScIwmWKOApMHHHXjoFeh5Ta3iow 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 05.06.25 19:43, Fuad Tabba wrote: > On Thu, 5 Jun 2025 at 18:35, David Hildenbrand wrote: >> >> On 05.06.25 18:11, Fuad Tabba wrote: >>> On Thu, 5 Jun 2025 at 16:49, David Hildenbrand wrote: >>>> >>>> On 05.06.25 17:37, Fuad Tabba wrote: >>>>> Define the architecture-specific macro to enable shared memory support >>>>> in guest_memfd for relevant software-only VM types, specifically >>>>> KVM_X86_DEFAULT_VM and KVM_X86_SW_PROTECTED_VM. >>>>> >>>>> Enable the KVM_GMEM_SHARED_MEM Kconfig option if KVM_SW_PROTECTED_VM is >>>>> enabled. >>>>> >>>>> Co-developed-by: Ackerley Tng >>>>> Signed-off-by: Ackerley Tng >>>>> Signed-off-by: Fuad Tabba >>>>> --- >>>>> arch/x86/include/asm/kvm_host.h | 10 ++++++++++ >>>>> arch/x86/kvm/Kconfig | 1 + >>>>> arch/x86/kvm/x86.c | 3 ++- >>>>> 3 files changed, 13 insertions(+), 1 deletion(-) >>>>> >>>>> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h >>>>> index 709cc2a7ba66..ce9ad4cd93c5 100644 >>>>> --- a/arch/x86/include/asm/kvm_host.h >>>>> +++ b/arch/x86/include/asm/kvm_host.h >>>>> @@ -2255,8 +2255,18 @@ void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level, >>>>> >>>>> #ifdef CONFIG_KVM_GMEM >>>>> #define kvm_arch_supports_gmem(kvm) ((kvm)->arch.supports_gmem) >>>>> + >>>>> +/* >>>>> + * CoCo VMs with hardware support that use guest_memfd only for backing private >>>>> + * memory, e.g., TDX, cannot use guest_memfd with userspace mapping enabled. >>>>> + */ >>>>> +#define kvm_arch_supports_gmem_shared_mem(kvm) \ >>>>> + (IS_ENABLED(CONFIG_KVM_GMEM_SHARED_MEM) && \ >>>>> + ((kvm)->arch.vm_type == KVM_X86_SW_PROTECTED_VM || \ >>>>> + (kvm)->arch.vm_type == KVM_X86_DEFAULT_VM)) >>>>> #else >>>>> #define kvm_arch_supports_gmem(kvm) false >>>>> +#define kvm_arch_supports_gmem_shared_mem(kvm) false >>>>> #endif >>>>> >>>>> #define kvm_arch_has_readonly_mem(kvm) (!(kvm)->arch.has_protected_state) >>>>> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig >>>>> index b37258253543..fdf24b50af9d 100644 >>>>> --- a/arch/x86/kvm/Kconfig >>>>> +++ b/arch/x86/kvm/Kconfig >>>>> @@ -47,6 +47,7 @@ config KVM_X86 >>>>> select KVM_GENERIC_HARDWARE_ENABLING >>>>> select KVM_GENERIC_PRE_FAULT_MEMORY >>>>> select KVM_GENERIC_GMEM_POPULATE if KVM_SW_PROTECTED_VM >>>>> + select KVM_GMEM_SHARED_MEM if KVM_SW_PROTECTED_VM >>>>> select KVM_WERROR if WERROR >>>> >>>> Is $subject and this still true, given that it's now also supported for >>>> KVM_X86_DEFAULT_VM? >>> >>> True, just not the whole truth :) >>> >>> I guess a better one would be, for Software VMs (remove protected)? >> >> Now I am curious, what is a Hardware VM? :) > > The opposite of a software one! ;) i.e., hardware-supported CoCo, > e.g., TDX, CCA... So, you mean a sofware VM is ... just an ordinary VM? :P "KVM: x86: Enable guest_memfd shared memory for ordinary (non-CoCo) VMs" ? But, whatever you prefer :) -- Cheers, David / dhildenb