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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 May 2025 05:48:08.3008 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3369aa85-7d0e-48e4-a5ed-08dd95cf9140 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF0000C37A.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4361 Content-Type: text/plain; charset="utf-8" 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) =20 /* 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) =20 static int check_memory_region_flags(struct kvm *kvm, const struct kvm_userspace_memory_region2 *mem) { - u32 valid_flags =3D KVM_MEM_LOG_DIRTY_PAGES; + u32 valid_flags =3D KVM_MEM_LOG_DIRTY_PAGES | + KVM_MEM_ENABLE_CACHEABLE_PFNMAP; =20 if (kvm_arch_has_private_mem(kvm)) valid_flags |=3D KVM_MEM_GUEST_MEMFD; --=20 2.34.1