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fix(hvf): treat X31 as zero register for MMIO #373

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Merged
Lencerf merged 1 commit into from
Jan 24, 2026
Merged

fix(hvf): treat X31 as zero register for MMIO #373

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11 changes: 8 additions & 3 deletions alioth/src/hv/hvf/vcpu/vmexit.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -48,11 +48,16 @@ impl HvfVcpu {
}
.fail();
}
let reg = HvReg::from(iss.srt());
let srt = iss.srt();
let reg = HvReg::from(srt);
let write = if iss.wnr() {
let mut value = 0;
let ret = unsafe { hv_vcpu_get_reg(self.vcpu_id, reg, &mut value) };
check_ret(ret).context(error::VcpuReg)?;
// On aarch64, register index of 31 corresponds to the zero register
// in the context of memory access.
if srt != 31 {
let ret = unsafe { hv_vcpu_get_reg(self.vcpu_id, reg, &mut value) };
check_ret(ret).context(error::VcpuReg)?;
}
Some(value)
} else {
self.exit_reg = Some(reg);
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