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author | Oliver Upton <oliver.upton@linux.dev> | 2023-06-15 16:05:11 +0300 |
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committer | Oliver Upton <oliver.upton@linux.dev> | 2023-06-15 16:05:11 +0300 |
commit | 89a734b54c1d9dd0574079ea373cdecf87438bc8 (patch) | |
tree | c9f2c765996bdbe25b5fccca1747f26061039f32 /arch/arm64/include/asm/kvm_host.h | |
parent | acfdf34c7de19e1ee9ce3ea2d47e2bf11620f910 (diff) | |
parent | 686672407e6eaf8c874d4a6bf315da798f281045 (diff) | |
download | linux-89a734b54c1d9dd0574079ea373cdecf87438bc8.tar.xz |
Merge branch kvm-arm64/configurable-id-regs into kvmarm/next
* kvm-arm64/configurable-id-regs:
: Configurable ID register infrastructure, courtesy of Jing Zhang
:
: Create generalized infrastructure for allowing userspace to select the
: supported feature set for a VM, so long as the feature set is a subset
: of what hardware + KVM allows. This does not add any new features that
: are user-configurable, and instead focuses on the necessary refactoring
: to enable future work.
:
: As a consequence of the series, feature asymmetry is now deliberately
: disallowed for KVM. It is unlikely that VMMs ever configured VMs with
: asymmetry, nor does it align with the kernel's overall stance that
: features must be uniform across all cores in the system.
:
: Furthermore, KVM incorrectly advertised an IMP_DEF PMU to guests for
: some time. Migrations from affected kernels was supported by explicitly
: allowing such an ID register value from userspace, and forwarding that
: along to the guest. KVM now allows an IMP_DEF PMU version to be restored
: through the ID register interface, but reinterprets the user value as
: not implemented (0).
KVM: arm64: Rip out the vestiges of the 'old' ID register scheme
KVM: arm64: Handle ID register reads using the VM-wide values
KVM: arm64: Use generic sanitisation for ID_AA64PFR0_EL1
KVM: arm64: Use generic sanitisation for ID_(AA64)DFR0_EL1
KVM: arm64: Use arm64_ftr_bits to sanitise ID register writes
KVM: arm64: Save ID registers' sanitized value per guest
KVM: arm64: Reuse fields of sys_reg_desc for idreg
KVM: arm64: Rewrite IMPDEF PMU version as NI
KVM: arm64: Make vCPU feature flags consistent VM-wide
KVM: arm64: Relax invariance of KVM_ARM_VCPU_POWER_OFF
KVM: arm64: Separate out feature sanitisation and initialisation
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/include/asm/kvm_host.h')
-rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 45 |
1 files changed, 25 insertions, 20 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 6fcc552b40b5..bad7dfe9c16d 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -39,6 +39,7 @@ #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS #define KVM_VCPU_MAX_FEATURES 7 +#define KVM_VCPU_VALID_FEATURES (BIT(KVM_VCPU_MAX_FEATURES) - 1) #define KVM_REQ_SLEEP \ KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) @@ -229,25 +230,23 @@ struct kvm_arch { #define KVM_ARCH_FLAG_MTE_ENABLED 1 /* At least one vCPU has ran in the VM */ #define KVM_ARCH_FLAG_HAS_RAN_ONCE 2 - /* - * The following two bits are used to indicate the guest's EL1 - * register width configuration. A value of KVM_ARCH_FLAG_EL1_32BIT - * bit is valid only when KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED is set. - * Otherwise, the guest's EL1 register width has not yet been - * determined yet. - */ -#define KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED 3 -#define KVM_ARCH_FLAG_EL1_32BIT 4 + /* The vCPU feature set for the VM is configured */ +#define KVM_ARCH_FLAG_VCPU_FEATURES_CONFIGURED 3 /* PSCI SYSTEM_SUSPEND enabled for the guest */ -#define KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED 5 +#define KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED 4 /* VM counter offset */ -#define KVM_ARCH_FLAG_VM_COUNTER_OFFSET 6 +#define KVM_ARCH_FLAG_VM_COUNTER_OFFSET 5 /* Timer PPIs made immutable */ -#define KVM_ARCH_FLAG_TIMER_PPIS_IMMUTABLE 7 +#define KVM_ARCH_FLAG_TIMER_PPIS_IMMUTABLE 6 /* SMCCC filter initialized for the VM */ -#define KVM_ARCH_FLAG_SMCCC_FILTER_CONFIGURED 8 +#define KVM_ARCH_FLAG_SMCCC_FILTER_CONFIGURED 7 + /* Initial ID reg values loaded */ +#define KVM_ARCH_FLAG_ID_REGS_INITIALIZED 8 unsigned long flags; + /* VM-wide vCPU feature set */ + DECLARE_BITMAP(vcpu_features, KVM_VCPU_MAX_FEATURES); + /* * VM-wide PMU filter, implemented as a bitmap and big enough for * up to 2^10 events (ARMv8.0) or 2^16 events (ARMv8.1+). @@ -257,18 +256,24 @@ struct kvm_arch { cpumask_var_t supported_cpus; - u8 pfr0_csv2; - u8 pfr0_csv3; - struct { - u8 imp:4; - u8 unimp:4; - } dfr0_pmuver; - /* Hypercall features firmware registers' descriptor */ struct kvm_smccc_features smccc_feat; struct maple_tree smccc_filter; /* + * Emulated CPU ID registers per VM + * (Op0, Op1, CRn, CRm, Op2) of the ID registers to be saved in it + * is (3, 0, 0, crm, op2), where 1<=crm<8, 0<=op2<8. + * + * These emulated idregs are VM-wide, but accessed from the context of a vCPU. + * Atomic access to multiple idregs are guarded by kvm_arch.config_lock. + */ +#define IDREG_IDX(id) (((sys_reg_CRm(id) - 1) << 3) | sys_reg_Op2(id)) +#define IDREG(kvm, id) ((kvm)->arch.id_regs[IDREG_IDX(id)]) +#define KVM_ARM_ID_REG_NUM (IDREG_IDX(sys_reg(3, 0, 0, 7, 7)) + 1) + u64 id_regs[KVM_ARM_ID_REG_NUM]; + + /* * For an untrusted host VM, 'pkvm.handle' is used to lookup * the associated pKVM instance in the hypervisor. */ |