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HV: Fix MP Init sequence hang by adding a delay

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As per the BWG a delay should be provided between the
INIT IPI and Startup IPI. Without the delay observe hangs
on certain platforms during MP Init sequence. So Setting
a delay of 10us between assert INIT IPI and Startup IPI.

Also, as per SDM section 10.7 the the de-assert INIT IPI is
only used for Pentium and P6 processors. This is not applicable
for Pentium4 and Xeon processors so removing this sequence.

Tracked-On: #4835
Signed-off-by: Vijay Dhanraj <vijay.dhanraj@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Vijay Dhanraj
2020-05-21 13:23:14 -07:00
committed by wenlingz
parent 8c090c71ca
commit d03df0c7e2
3 changed files with 12 additions and 30 deletions
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6
hypervisor/include/arch/x86/lapic.h
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@@ -131,15 +131,11 @@ void send_lapic_eoi(void);
*
* Send an Startup IPI to a specific cpu, to notify the cpu to start booting.
*
* @param[in] cpu_startup_shorthand The startup_shorthand
* @param[in] dest_pcpu_id The id of destination physical cpu
* @param[in] cpu_startup_start_address The address for the dest pCPU to start running
*
* @pre cpu_startup_shorthand < INTR_CPU_STARTUP_UNKNOWN
*/
void send_startup_ipi(enum intr_cpu_startup_shorthand cpu_startup_shorthand,
uint16_t dest_pcpu_id,
uint64_t cpu_startup_start_address);
void send_startup_ipi(uint16_t dest_pcpu_id, uint64_t cpu_startup_start_address);
/**
* @brief Send an IPI to multiple pCPUs