From: Michael Kelley mhklinux@outlook.com
[ Upstream commit 8fcc514809de41153b43ccbe1a0cdf7f72b78e7e ]
A Linux guest on Hyper-V gets the TSC frequency from a synthetic MSR, if available. In this case, set X86_FEATURE_TSC_KNOWN_FREQ so that Linux doesn't unnecessarily do refined TSC calibration when setting up the TSC clocksource.
With this change, a message such as this is no longer output during boot when the TSC is used as the clocksource:
[ 1.115141] tsc: Refined TSC clocksource calibration: 2918.408 MHz
Furthermore, the guest and host will have exactly the same view of the TSC frequency, which is important for features such as the TSC deadline timer that are emulated by the Hyper-V host.
Signed-off-by: Michael Kelley mhklinux@outlook.com Reviewed-by: Roman Kisel romank@linux.microsoft.com Link: https://lore.kernel.org/r/20240606025559.1631-1-mhklinux@outlook.com Signed-off-by: Wei Liu wei.liu@kernel.org Message-ID: 20240606025559.1631-1-mhklinux@outlook.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/kernel/cpu/mshyperv.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 9b039e9635e4..542b818c0d20 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -324,6 +324,7 @@ static void __init ms_hyperv_init_platform(void) ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) { x86_platform.calibrate_tsc = hv_get_tsc_khz; x86_platform.calibrate_cpu = hv_get_tsc_khz; + setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ); }
if (ms_hyperv.priv_high & HV_ISOLATION) {
From: zhang jiao zhangjiao2@cmss.chinamobile.com
[ Upstream commit 5e5cc1eb65256e6017e3deec04f9806f2f317853 ]
rm .*.cmd when make clean
Signed-off-by: zhang jiao zhangjiao2@cmss.chinamobile.com Reviewed-by: Saurabh Sengar ssengar@linux.microsoft.com Link: https://lore.kernel.org/r/20240902042103.5867-1-zhangjiao2@cmss.chinamobile.... Signed-off-by: Wei Liu wei.liu@kernel.org Message-ID: 20240902042103.5867-1-zhangjiao2@cmss.chinamobile.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/hv/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/hv/Makefile b/tools/hv/Makefile index fe770e679ae8..5643058e2d37 100644 --- a/tools/hv/Makefile +++ b/tools/hv/Makefile @@ -47,7 +47,7 @@ $(OUTPUT)hv_fcopy_daemon: $(HV_FCOPY_DAEMON_IN)
clean: rm -f $(ALL_PROGRAMS) - find $(or $(OUTPUT),.) -name '*.o' -delete -o -name '.*.d' -delete + find $(or $(OUTPUT),.) -name '*.o' -delete -o -name '.*.d' -delete -o -name '.*.cmd' -delete
install: $(ALL_PROGRAMS) install -d -m 755 $(DESTDIR)$(sbindir); \
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