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devices: avoid unnecessary allocations in TPM code

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Use the data buffer in the TPM device directly.

Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu
2023-01-25 21:38:13 +00:00
committed by Rob Bradford
parent e41b7d90d5
commit cffde0ff65
2 changed files with 22 additions and 41 deletions
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14
devices/src/tpm.rs
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@@ -471,22 +471,14 @@ impl BusDevice for Tpm {
{
self.regs[CRB_CTRL_START as usize] |= CRB_START_INVOKE;
let cmd = BackendCmd {
let mut cmd = BackendCmd {
locality: locality as u8,
input: self.data_buff[0..self.data_buff_len].to_vec(),
buffer: &mut self.data_buff,
input_len: cmp::min(self.data_buff_len, TPM_CRB_BUFFER_MAX),
output: self.data_buff.to_vec(),
output_len: TPM_CRB_BUFFER_MAX,
selftest_done: false,
};
let mut cmd = cmd.clone();
if let Ok(output) = self.emulator.deliver_request(&mut cmd) {
// TODO: drop the copy here
self.data_buff.fill(0);
self.data_buff.clone_from_slice(output.as_slice());
}
let _ = self.emulator.deliver_request(&mut cmd);
self.request_completed(TPM_SUCCESS as isize);
}