mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 06:15:38 +07:00
39497d7660
Automatically adjusting the globally-shared timer advancement could
corrupt the timer, e.g. if multiple vCPUs are concurrently adjusting
the advancement value. That could be partially fixed by using a local
variable for the arithmetic, but it would still be susceptible to a
race when setting timer_advance_adjust_done.
And because virtual_tsc_khz and tsc_scaling_ratio are per-vCPU, the
correct calibration for a given vCPU may not apply to all vCPUs.
Furthermore, lapic_timer_advance_ns is marked __read_mostly, which is
effectively violated when finding a stable advancement takes an extended
amount of timer.
Opportunistically change the definition of lapic_timer_advance_ns to
a u32 so that it matches the style of struct kvm_timer. Explicitly
pass the param to kvm_create_lapic() so that it doesn't have to be
exposed to lapic.c, thus reducing the probability of unintentionally
using the global value instead of the per-vCPU value.
Cc: Liran Alon <liran.alon@oracle.com>
Cc: Wanpeng Li <wanpengli@tencent.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Cc: stable@vger.kernel.org
Fixes: 3b8a5df6c4 ("KVM: LAPIC: Tune lapic_timer_advance_ns automatically")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
351 lines
8.4 KiB
C
351 lines
8.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef ARCH_X86_KVM_X86_H
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#define ARCH_X86_KVM_X86_H
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#include <linux/kvm_host.h>
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#include <asm/pvclock.h>
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#include "kvm_cache_regs.h"
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#define KVM_DEFAULT_PLE_GAP 128
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#define KVM_VMX_DEFAULT_PLE_WINDOW 4096
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#define KVM_DEFAULT_PLE_WINDOW_GROW 2
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#define KVM_DEFAULT_PLE_WINDOW_SHRINK 0
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#define KVM_VMX_DEFAULT_PLE_WINDOW_MAX UINT_MAX
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#define KVM_SVM_DEFAULT_PLE_WINDOW_MAX USHRT_MAX
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#define KVM_SVM_DEFAULT_PLE_WINDOW 3000
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static inline unsigned int __grow_ple_window(unsigned int val,
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unsigned int base, unsigned int modifier, unsigned int max)
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{
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u64 ret = val;
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if (modifier < 1)
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return base;
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if (modifier < base)
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ret *= modifier;
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else
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ret += modifier;
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return min(ret, (u64)max);
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}
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static inline unsigned int __shrink_ple_window(unsigned int val,
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unsigned int base, unsigned int modifier, unsigned int min)
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{
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if (modifier < 1)
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return base;
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if (modifier < base)
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val /= modifier;
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else
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val -= modifier;
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return max(val, min);
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}
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#define MSR_IA32_CR_PAT_DEFAULT 0x0007040600070406ULL
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static inline void kvm_clear_exception_queue(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.exception.pending = false;
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vcpu->arch.exception.injected = false;
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}
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static inline void kvm_queue_interrupt(struct kvm_vcpu *vcpu, u8 vector,
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bool soft)
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{
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vcpu->arch.interrupt.injected = true;
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vcpu->arch.interrupt.soft = soft;
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vcpu->arch.interrupt.nr = vector;
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}
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static inline void kvm_clear_interrupt_queue(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.interrupt.injected = false;
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}
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static inline bool kvm_event_needs_reinjection(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.exception.injected || vcpu->arch.interrupt.injected ||
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vcpu->arch.nmi_injected;
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}
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static inline bool kvm_exception_is_soft(unsigned int nr)
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{
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return (nr == BP_VECTOR) || (nr == OF_VECTOR);
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}
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static inline bool is_protmode(struct kvm_vcpu *vcpu)
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{
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return kvm_read_cr0_bits(vcpu, X86_CR0_PE);
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}
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static inline int is_long_mode(struct kvm_vcpu *vcpu)
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{
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#ifdef CONFIG_X86_64
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return vcpu->arch.efer & EFER_LMA;
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#else
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return 0;
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#endif
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}
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static inline bool is_64_bit_mode(struct kvm_vcpu *vcpu)
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{
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int cs_db, cs_l;
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if (!is_long_mode(vcpu))
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return false;
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kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
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return cs_l;
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}
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static inline bool is_la57_mode(struct kvm_vcpu *vcpu)
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{
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#ifdef CONFIG_X86_64
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return (vcpu->arch.efer & EFER_LMA) &&
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kvm_read_cr4_bits(vcpu, X86_CR4_LA57);
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#else
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return 0;
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#endif
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}
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static inline bool x86_exception_has_error_code(unsigned int vector)
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{
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static u32 exception_has_error_code = BIT(DF_VECTOR) | BIT(TS_VECTOR) |
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BIT(NP_VECTOR) | BIT(SS_VECTOR) | BIT(GP_VECTOR) |
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BIT(PF_VECTOR) | BIT(AC_VECTOR);
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return (1U << vector) & exception_has_error_code;
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}
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static inline bool mmu_is_nested(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.walk_mmu == &vcpu->arch.nested_mmu;
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}
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static inline int is_pae(struct kvm_vcpu *vcpu)
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{
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return kvm_read_cr4_bits(vcpu, X86_CR4_PAE);
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}
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static inline int is_pse(struct kvm_vcpu *vcpu)
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{
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return kvm_read_cr4_bits(vcpu, X86_CR4_PSE);
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}
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static inline int is_paging(struct kvm_vcpu *vcpu)
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{
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return likely(kvm_read_cr0_bits(vcpu, X86_CR0_PG));
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}
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static inline u32 bit(int bitno)
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{
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return 1 << (bitno & 31);
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}
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static inline u8 vcpu_virt_addr_bits(struct kvm_vcpu *vcpu)
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{
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return kvm_read_cr4_bits(vcpu, X86_CR4_LA57) ? 57 : 48;
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}
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static inline u8 ctxt_virt_addr_bits(struct x86_emulate_ctxt *ctxt)
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{
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return (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_LA57) ? 57 : 48;
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}
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static inline u64 get_canonical(u64 la, u8 vaddr_bits)
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{
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return ((int64_t)la << (64 - vaddr_bits)) >> (64 - vaddr_bits);
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}
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static inline bool is_noncanonical_address(u64 la, struct kvm_vcpu *vcpu)
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{
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#ifdef CONFIG_X86_64
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return get_canonical(la, vcpu_virt_addr_bits(vcpu)) != la;
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#else
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return false;
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#endif
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}
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static inline bool emul_is_noncanonical_address(u64 la,
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struct x86_emulate_ctxt *ctxt)
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{
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#ifdef CONFIG_X86_64
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return get_canonical(la, ctxt_virt_addr_bits(ctxt)) != la;
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#else
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return false;
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#endif
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}
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static inline void vcpu_cache_mmio_info(struct kvm_vcpu *vcpu,
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gva_t gva, gfn_t gfn, unsigned access)
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{
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u64 gen = kvm_memslots(vcpu->kvm)->generation;
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if (unlikely(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS))
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return;
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/*
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* If this is a shadow nested page table, the "GVA" is
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* actually a nGPA.
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*/
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vcpu->arch.mmio_gva = mmu_is_nested(vcpu) ? 0 : gva & PAGE_MASK;
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vcpu->arch.access = access;
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vcpu->arch.mmio_gfn = gfn;
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vcpu->arch.mmio_gen = gen;
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}
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static inline bool vcpu_match_mmio_gen(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.mmio_gen == kvm_memslots(vcpu->kvm)->generation;
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}
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/*
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* Clear the mmio cache info for the given gva. If gva is MMIO_GVA_ANY, we
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* clear all mmio cache info.
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*/
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#define MMIO_GVA_ANY (~(gva_t)0)
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static inline void vcpu_clear_mmio_info(struct kvm_vcpu *vcpu, gva_t gva)
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{
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if (gva != MMIO_GVA_ANY && vcpu->arch.mmio_gva != (gva & PAGE_MASK))
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return;
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vcpu->arch.mmio_gva = 0;
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}
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static inline bool vcpu_match_mmio_gva(struct kvm_vcpu *vcpu, unsigned long gva)
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{
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if (vcpu_match_mmio_gen(vcpu) && vcpu->arch.mmio_gva &&
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vcpu->arch.mmio_gva == (gva & PAGE_MASK))
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return true;
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return false;
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}
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static inline bool vcpu_match_mmio_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
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{
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if (vcpu_match_mmio_gen(vcpu) && vcpu->arch.mmio_gfn &&
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vcpu->arch.mmio_gfn == gpa >> PAGE_SHIFT)
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return true;
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return false;
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}
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static inline unsigned long kvm_register_readl(struct kvm_vcpu *vcpu,
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enum kvm_reg reg)
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{
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unsigned long val = kvm_register_read(vcpu, reg);
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return is_64_bit_mode(vcpu) ? val : (u32)val;
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}
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static inline void kvm_register_writel(struct kvm_vcpu *vcpu,
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enum kvm_reg reg,
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unsigned long val)
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{
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if (!is_64_bit_mode(vcpu))
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val = (u32)val;
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return kvm_register_write(vcpu, reg, val);
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}
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static inline bool kvm_check_has_quirk(struct kvm *kvm, u64 quirk)
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{
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return !(kvm->arch.disabled_quirks & quirk);
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}
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void kvm_set_pending_timer(struct kvm_vcpu *vcpu);
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int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
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void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr);
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u64 get_kvmclock_ns(struct kvm *kvm);
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int kvm_read_guest_virt(struct kvm_vcpu *vcpu,
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gva_t addr, void *val, unsigned int bytes,
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struct x86_exception *exception);
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int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu,
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gva_t addr, void *val, unsigned int bytes,
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struct x86_exception *exception);
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int handle_ud(struct kvm_vcpu *vcpu);
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void kvm_deliver_exception_payload(struct kvm_vcpu *vcpu);
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void kvm_vcpu_mtrr_init(struct kvm_vcpu *vcpu);
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u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
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bool kvm_mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data);
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int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data);
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int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
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bool kvm_mtrr_check_gfn_range_consistency(struct kvm_vcpu *vcpu, gfn_t gfn,
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int page_num);
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bool kvm_vector_hashing_enabled(void);
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int x86_emulate_instruction(struct kvm_vcpu *vcpu, unsigned long cr2,
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int emulation_type, void *insn, int insn_len);
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#define KVM_SUPPORTED_XCR0 (XFEATURE_MASK_FP | XFEATURE_MASK_SSE \
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| XFEATURE_MASK_YMM | XFEATURE_MASK_BNDREGS \
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| XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \
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| XFEATURE_MASK_PKRU)
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extern u64 host_xcr0;
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extern u64 kvm_supported_xcr0(void);
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extern unsigned int min_timer_period_us;
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extern bool enable_vmware_backdoor;
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extern struct static_key kvm_no_apic_vcpu;
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static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
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{
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return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,
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vcpu->arch.virtual_tsc_shift);
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}
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/* Same "calling convention" as do_div:
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* - divide (n << 32) by base
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* - put result in n
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* - return remainder
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*/
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#define do_shl32_div32(n, base) \
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({ \
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u32 __quot, __rem; \
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asm("divl %2" : "=a" (__quot), "=d" (__rem) \
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: "rm" (base), "0" (0), "1" ((u32) n)); \
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n = __quot; \
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__rem; \
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})
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static inline bool kvm_mwait_in_guest(struct kvm *kvm)
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{
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return kvm->arch.mwait_in_guest;
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}
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static inline bool kvm_hlt_in_guest(struct kvm *kvm)
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{
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return kvm->arch.hlt_in_guest;
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}
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static inline bool kvm_pause_in_guest(struct kvm *kvm)
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{
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return kvm->arch.pause_in_guest;
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}
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DECLARE_PER_CPU(struct kvm_vcpu *, current_vcpu);
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static inline void kvm_before_interrupt(struct kvm_vcpu *vcpu)
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{
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__this_cpu_write(current_vcpu, vcpu);
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}
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static inline void kvm_after_interrupt(struct kvm_vcpu *vcpu)
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{
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__this_cpu_write(current_vcpu, NULL);
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}
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void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu);
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void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu);
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#endif
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