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acrn-hypervisor/hypervisor/arch/x86/nmi.c

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hv/mod_irq: move NMI and exception handler out of x86/irq.c Each of them now resides in a separate .c file. Tracked-On: #5825 Signed-off-by: Yang, Yu-chu <yu-chu.yang@intel.com> Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
2021-03-02 10:24:14 +08:00
/*
* Copyright (C) 2018 Intel Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
hv: mod: do not use explicit arch name when including headers Instead of "#include <x86/foo.h>", use "#include <asm/foo.h>". In other words, we are adopting the same practice in Linux kernel. Tracked-On: #5920 Signed-off-by: Liang Yi <yi.liang@intel.com> Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
2021-04-23 15:50:57 +08:00
#include <asm/irq.h>
#include <asm/vmx.h>
hv/mod_irq: move NMI and exception handler out of x86/irq.c Each of them now resides in a separate .c file. Tracked-On: #5825 Signed-off-by: Yang, Yu-chu <yu-chu.yang@intel.com> Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
2021-03-02 10:24:14 +08:00
void handle_nmi(__unused struct intr_excp_ctx *ctx)
{
uint32_t value32;
/*
* There is a window where we may miss the current request in this
* notification period when the work flow is as the following:
*
* CPUx + + CPUr
* | |
* | +--+
* | | | Handle pending req
* | <--+
* +--+ |
* | | Set req flag |
* <--+ |
* +------------------>---+
* | Send NMI | | Handle NMI
* | <--+
* | |
* | |
* | +--> vCPU enter
* | |
* + +
*
* So, here we enable the NMI-window exiting to trigger the next vmexit
* once there is no "virtual-NMI blocking" after vCPU enter into VMX non-root
* mode. Then we can process the pending request on time.
*/
value32 = exec_vmread32(VMX_PROC_VM_EXEC_CONTROLS);
value32 |= VMX_PROCBASED_CTLS_NMI_WINEXIT;
exec_vmwrite32(VMX_PROC_VM_EXEC_CONTROLS, value32);
}