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linux-next/arch/x86/kvm/kvm_cache_regs.h
Sean Christopherson 34059c2570 KVM: x86: Fold decache_cr3() into cache_reg() 
Handle caching CR3 (from VMX's VMCS) into struct kvm_vcpu via the common
cache_reg() callback and drop the dedicated decache_cr3().  The name
decache_cr3() is somewhat confusing as the caching behavior of CR3
follows that of GPRs, RFLAGS and PDPTRs, (handled via cache_reg()), and
has nothing in common with the caching behavior of CR0/CR4 (whose
decache_cr{0,4}_guest_bits() likely provided the 'decache' verbiage).

This would effectivel adds a BUG() if KVM attempts to cache CR3 on SVM.
Change it to a WARN_ON_ONCE() -- if the cache never requires filling,
the value is already in the right place -- and opportunistically add one
in VMX to provide an equivalent check.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2019-10-22 13:34:16 +02:00

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ASM_KVM_CACHE_REGS_H
#define ASM_KVM_CACHE_REGS_H
#include <linux/kvm_host.h>
#define KVM_POSSIBLE_CR0_GUEST_BITS X86_CR0_TS
#define KVM_POSSIBLE_CR4_GUEST_BITS \
(X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \
| X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_PGE)
#define BUILD_KVM_GPR_ACCESSORS(lname, uname) \
static __always_inline unsigned long kvm_##lname##_read(struct kvm_vcpu *vcpu)\
{ \
return vcpu->arch.regs[VCPU_REGS_##uname]; \
} \
static __always_inline void kvm_##lname##_write(struct kvm_vcpu *vcpu, \
unsigned long val) \
{ \
vcpu->arch.regs[VCPU_REGS_##uname] = val; \
}
BUILD_KVM_GPR_ACCESSORS(rax, RAX)
BUILD_KVM_GPR_ACCESSORS(rbx, RBX)
BUILD_KVM_GPR_ACCESSORS(rcx, RCX)
BUILD_KVM_GPR_ACCESSORS(rdx, RDX)
BUILD_KVM_GPR_ACCESSORS(rbp, RBP)
BUILD_KVM_GPR_ACCESSORS(rsi, RSI)
BUILD_KVM_GPR_ACCESSORS(rdi, RDI)
#ifdef CONFIG_X86_64
BUILD_KVM_GPR_ACCESSORS(r8, R8)
BUILD_KVM_GPR_ACCESSORS(r9, R9)
BUILD_KVM_GPR_ACCESSORS(r10, R10)
BUILD_KVM_GPR_ACCESSORS(r11, R11)
BUILD_KVM_GPR_ACCESSORS(r12, R12)
BUILD_KVM_GPR_ACCESSORS(r13, R13)
BUILD_KVM_GPR_ACCESSORS(r14, R14)
BUILD_KVM_GPR_ACCESSORS(r15, R15)
#endif
static inline bool kvm_register_is_available(struct kvm_vcpu *vcpu,
enum kvm_reg reg)
{
return test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
}
static inline bool kvm_register_is_dirty(struct kvm_vcpu *vcpu,
enum kvm_reg reg)
{
return test_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);
}
static inline void kvm_register_mark_available(struct kvm_vcpu *vcpu,
enum kvm_reg reg)
{
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
}
static inline void kvm_register_mark_dirty(struct kvm_vcpu *vcpu,
enum kvm_reg reg)
{
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);
}
static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu, int reg)
{
if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS))
return 0;
if (!kvm_register_is_available(vcpu, reg))
kvm_x86_ops->cache_reg(vcpu, reg);
return vcpu->arch.regs[reg];
}
static inline void kvm_register_write(struct kvm_vcpu *vcpu, int reg,
unsigned long val)
{
if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS))
return;
vcpu->arch.regs[reg] = val;
kvm_register_mark_dirty(vcpu, reg);
}
static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu)
{
return kvm_register_read(vcpu, VCPU_REGS_RIP);
}
static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val)
{
kvm_register_write(vcpu, VCPU_REGS_RIP, val);
}
static inline unsigned long kvm_rsp_read(struct kvm_vcpu *vcpu)
{
return kvm_register_read(vcpu, VCPU_REGS_RSP);
}
static inline void kvm_rsp_write(struct kvm_vcpu *vcpu, unsigned long val)
{
kvm_register_write(vcpu, VCPU_REGS_RSP, val);
}
static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
{
might_sleep(); /* on svm */
if (!kvm_register_is_available(vcpu, VCPU_EXREG_PDPTR))
kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_PDPTR);
return vcpu->arch.walk_mmu->pdptrs[index];
}
static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
{
ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS;
if (tmask & vcpu->arch.cr0_guest_owned_bits)
kvm_x86_ops->decache_cr0_guest_bits(vcpu);
return vcpu->arch.cr0 & mask;
}
static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu)
{
return kvm_read_cr0_bits(vcpu, ~0UL);
}
static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask)
{
ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS;
if (tmask & vcpu->arch.cr4_guest_owned_bits)
kvm_x86_ops->decache_cr4_guest_bits(vcpu);
return vcpu->arch.cr4 & mask;
}
static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu)
{
if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3))
kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_CR3);
return vcpu->arch.cr3;
}
static inline ulong kvm_read_cr4(struct kvm_vcpu *vcpu)
{
return kvm_read_cr4_bits(vcpu, ~0UL);
}
static inline u64 kvm_read_edx_eax(struct kvm_vcpu *vcpu)
{
return (kvm_rax_read(vcpu) & -1u)
| ((u64)(kvm_rdx_read(vcpu) & -1u) << 32);
}
static inline void enter_guest_mode(struct kvm_vcpu *vcpu)
{
vcpu->arch.hflags |= HF_GUEST_MASK;
}
static inline void leave_guest_mode(struct kvm_vcpu *vcpu)
{
vcpu->arch.hflags &= ~HF_GUEST_MASK;
if (vcpu->arch.load_eoi_exitmap_pending) {
vcpu->arch.load_eoi_exitmap_pending = false;
kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu);
}
}
static inline bool is_guest_mode(struct kvm_vcpu *vcpu)
{
return vcpu->arch.hflags & HF_GUEST_MASK;
}
static inline bool is_smm(struct kvm_vcpu *vcpu)
{
return vcpu->arch.hflags & HF_SMM_MASK;
}
#endif
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