On 7/7/21 7:54 PM, isaku.yamahata@xxxxxxxxx wrote:
From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Make kvm_synchronize_all_tsc() nop for TD-guest.
s/nop/noop
TDX module specification, 9.11.1 TSC Virtualization
This appears in 9.12.1 of the latest revision as of this writing.
https://software.intel.com/content/dam/develop/external/us/en/documents/tdx-module-1eas-v0.85.039.pdf
"Virtual TSC values are consistent among all the TD;s VCPUs at the
s/TD;s/TDs
level suppored by the CPU".
s/suppored/supported
There is no need for qemu to synchronize tsc and VMM can't access
to guest TSC. Actually do_kvm_synchronize_tsc() hits assert due to
failure to write to guest tsc.
qemu/target/i386/kvm.c:235: kvm_get_tsc: Assertion `ret == 1' failed.
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Reviewed-by: Connor Kuehl <ckuehl@xxxxxxxxxx>
