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KVM: x86: Drop non-raw kvm_<reg>_write() helpers

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Drop the non-raw, mode-aware kvm_<reg>_write() helpers as there is no
usage in KVM, and in all likelihood there will never be usage in KVM as
use of hardcoded registers in instructions is uncommon, and *modifying*
hardcoded registers is practically unheard of.  While there are a few
instructions that modify registers in mode-aware ways, e.g. REP string
and some ENCLS varieties, the odds of KVM needing to emulate such
instructions (outside of the fully emulator) are vanishingly small.

Drop kvm_<reg>_write() to prevent incorrect usage; _if_ a new instruction
comes along that needs to modify a hardcoded register, this can be
reverted.

No functional change intended.

Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Link: https://patch.msgid.link/20260529222223.870923-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-05-29 15:21:52 -07:00
parent fc40b1254c
commit 308851c2d6
1 changed files with 0 additions and 5 deletions
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5
arch/x86/kvm/regs.h
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@ -61,11 +61,6 @@ static __always_inline unsigned long kvm_##lname##_read(struct kvm_vcpu *vcpu)
{ \
return vcpu->arch.regs[VCPU_REGS_##uname] & kvm_reg_mode_mask(vcpu); \
} \
static __always_inline void kvm_##lname##_write(struct kvm_vcpu *vcpu, \
unsigned long val) \
{ \
vcpu->arch.regs[VCPU_REGS_##uname] = val & kvm_reg_mode_mask(vcpu); \
} \
static __always_inline unsigned long kvm_##lname##_read_raw(struct kvm_vcpu *vcpu) \
{ \
return vcpu->arch.regs[VCPU_REGS_##uname]; \