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KVM: x86: Use kvm_dr{6,7}_valid() to check DR{4,5,6,7} write values in emulator

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Use kvm_dr{6,7}_valid() to validate the incoming DR{4,5,6,7} value in the
emulator instead of open coding an equivalent check.  In the unlikely event
that the behavior of DR6/7 (and their aliases) changes in the future, using
common helpers will hopefully make it less likely the emulator logic will
be overlooked.

No functional change intended.

Reviewed-by: Jim Mattson <jmattson@google.com>
Link: https://patch.msgid.link/20260612230113.684301-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-06-12 16:01:11 -07:00
parent 48512697c0
commit 1f077338d1
1 changed files with 5 additions and 2 deletions
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7
arch/x86/kvm/emulate.c
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@ -3869,10 +3869,13 @@ static int check_dr_write(struct x86_emulate_ctxt *ctxt)
switch (ctxt->modrm_reg) {
case 4:
case 5:
case 6:
if (!kvm_dr6_valid(new_val))
return emulate_gp(ctxt, 0);
break;
case 5:
case 7:
if (new_val & 0xffffffff00000000ULL)
if (!kvm_dr7_valid(new_val))
return emulate_gp(ctxt, 0);
break;
default: