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hv: disable host MONITOR-WAIT support when SW SRAM is enabled

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Per-core software SRAM L2 cache may be flushed by 'mwait'
extension instruction, which guest VM may execute to enter
core deep sleep. Such kind of flushing is not expected when
software SRAM is enabled for RTVM.

Hypervisor disables MONITOR-WAIT support on both hypervisor
and VMs sides to protect above software SRAM from being flushed.

This patch disable hypervisor(host) MONITOR-WAIT support and refine
software sram initializaion flow.

Tracked-On: #5649
Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
Reviewed-by: Fei Li <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Yonghua Huang
2021-03-10 11:55:18 +08:00
committed by wenlingz
parent ea44bb6c4d
commit ae43b2a847
5 changed files with 43 additions and 7 deletions
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2
hypervisor/include/arch/x86/rtcm.h
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@@ -26,7 +26,7 @@ struct rtcm_header {
uint64_t command_offset;
} __packed;
void init_software_sram(bool is_bsp);
bool init_software_sram(bool is_bsp);
void set_rtct_tbl(void *rtct_tbl_addr);
bool is_software_sram_enabled(void);
#endif /* RTCM_H */