Commit f55ce5a6 authored by Ankit Agrawal's avatar Ankit Agrawal Committed by Oliver Upton
Browse files

KVM: arm64: Expose new KVM cap for cacheable PFNMAP 



Introduce a new KVM capability to expose to the userspace whether
cacheable mapping of PFNMAP is supported.

The ability to safely do the cacheable mapping of PFNMAP is contingent
on S2FWB and ARM64_HAS_CACHE_DIC. S2FWB allows KVM to avoid flushing
the D cache, ARM64_HAS_CACHE_DIC allows KVM to avoid flushing the icache
and turns icache_inval_pou() into a NOP. The cap would be false if
those requirements are missing and is checked by making use of
kvm_arch_supports_cacheable_pfnmap.

This capability would allow userspace to discover the support.
It could for instance be used by userspace to prevent live-migration
across FWB and non-FWB hosts.

CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Jason Gunthorpe <jgg@nvidia.com>
CC: Oliver Upton <oliver.upton@linux.dev>
CC: David Hildenbrand <david@redhat.com>
Suggested-by: default avatarMarc Zyngier <maz@kernel.org>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Tested-by: default avatarDonald Dutile <ddutile@redhat.com>
Signed-off-by: default avatarAnkit Agrawal <ankita@nvidia.com>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20250705071717.5062-7-ankita@nvidia.com


Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
parent 0c67288e

Documentation/virt/kvm/api.rst

+12 −1
Original line number Diff line number Diff line
@@ -8585,7 +8585,7 @@ ENOSYS for the others. 
When enabled, KVM will exit to userspace with KVM_EXIT_SYSTEM_EVENT of

type KVM_SYSTEM_EVENT_SUSPEND to process the guest suspend request.



7.37 KVM_CAP_ARM_WRITABLE_IMP_ID_REGS

7.42 KVM_CAP_ARM_WRITABLE_IMP_ID_REGS

-------------------------------------



:Architectures: arm64
@@ -8614,6 +8614,17 @@ given VM. 
When this capability is enabled, KVM resets the VCPU when setting

MP_STATE_INIT_RECEIVED through IOCTL.  The original MP_STATE is preserved.



7.43 KVM_CAP_ARM_CACHEABLE_PFNMAP_SUPPORTED

-------------------------------------------



:Architectures: arm64

:Target: VM

:Parameters: None



This capability indicate to the userspace whether a PFNMAP memory region

can be safely mapped as cacheable. This relies on the presence of

force write back (FWB) feature support on the hardware.



8. Other capabilities.

======================

arch/arm64/kvm/arm.c

+7 −0
Original line number Diff line number Diff line
@@ -408,6 +408,13 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
	case KVM_CAP_ARM_SUPPORTED_REG_MASK_RANGES:

		r = BIT(0);

		break;

	case KVM_CAP_ARM_CACHEABLE_PFNMAP_SUPPORTED:

		if (!kvm)

			r = -EINVAL;

		else

			r = kvm_supports_cacheable_pfnmap();

		break;



	default:

		r = 0;

	}

include/uapi/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -956,6 +956,7 @@ struct kvm_enable_cap { 
#define KVM_CAP_ARM_EL2 240

#define KVM_CAP_ARM_EL2_E2H0 241

#define KVM_CAP_RISCV_MP_STATE_RESET 242

#define KVM_CAP_ARM_CACHEABLE_PFNMAP_SUPPORTED 243



struct kvm_irq_routing_irqchip {

	__u32 irqchip;