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hv: io_req: refine vhm_req status setting

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In spite of vhm_req status could be updated in HV and DM on different CPUs, they
only change vhm_req status when they detect vhm_req status has been updated by
each other. So vhm_req status will not been misconfigured. However, before HV
sets vhm_req status to REQ_STATE_PENDING, vhm_req buffer filling should be visible
to DM. Add a write memory barrier to guarantee this.

Tracked-On: #1842
Signed-off-by: Li, Fei1 <fei1.li@intel.com>
This commit is contained in:
Li, Fei1
2019-07-03 00:21:43 +08:00
committed by wenlingz
parent 1ea3052f80
commit 5930e96d12
2 changed files with 23 additions and 4 deletions
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6
hypervisor/include/arch/x86/cpu.h
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@@ -351,6 +351,12 @@ static inline void cpu_sp_write(uint64_t *stack_ptr)
asm volatile ("movq %0, %%rsp" : : "r"(rsp));
}
/* Synchronizes all write accesses to memory */
static inline void cpu_write_memory_barrier(void)
{
asm volatile ("sfence\n" : : : "memory");
}
/* Synchronizes all read and write accesses to/from memory */
static inline void cpu_memory_barrier(void)
{