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hv: PAUSE-loop exiting support in hypervisor

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As we enabled cpu sharing, PAUSE-loop exiting can help vcpu
to release its pcpu proactively. It's good for performance.

VMX_PLE_GAP: upper bound on the amount of time between two successive
executions of PAUSE in a loop.
VMX_PLE_WINDOW: upper bound on the amount of time a guest is allowed to
execute in a PAUSE loop

Tracked-On: #4329
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Shuo A Liu 2019-06-18 18:17:40 +08:00 committed by wenlingz
parent bfecf30f32
commit 4115dd6241
2 changed files with 14 additions and 2 deletions
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7
hypervisor/arch/x86/guest/vmcs.c
View File

@ -297,7 +297,8 @@ static void init_exec_ctrl(struct acrn_vcpu *vcpu)
*/
value32 = check_vmx_ctrl(MSR_IA32_VMX_PROCBASED_CTLS2,
VMX_PROCBASED_CTLS2_VAPIC | VMX_PROCBASED_CTLS2_EPT |VMX_PROCBASED_CTLS2_VPID |
VMX_PROCBASED_CTLS2_RDTSCP | VMX_PROCBASED_CTLS2_UNRESTRICT);
VMX_PROCBASED_CTLS2_RDTSCP | VMX_PROCBASED_CTLS2_UNRESTRICT |
VMX_PROCBASED_CTLS2_PAUSE_LOOP);
/* SDM Vol3, 25.3, setting "enable INVPCID" VM-execution to 1 with "INVLPG exiting" disabled,
* passes-through INVPCID instruction to guest if the instruction is supported.
@ -425,6 +426,10 @@ static void init_exec_ctrl(struct acrn_vcpu *vcpu)
exec_vmwrite(VMX_CR3_TARGET_1, 0UL);
exec_vmwrite(VMX_CR3_TARGET_2, 0UL);
exec_vmwrite(VMX_CR3_TARGET_3, 0UL);
/* Setup PAUSE-loop exiting - 24.6.13 */
exec_vmwrite(VMX_PLE_GAP, 128U);
exec_vmwrite(VMX_PLE_WINDOW, 4096U);
}
static void init_entry_ctrl(const struct acrn_vcpu *vcpu)

9
hypervisor/arch/x86/guest/vmexit.c
View File

@ -30,6 +30,7 @@ static int32_t unhandled_vmexit_handler(struct acrn_vcpu *vcpu);
static int32_t xsetbv_vmexit_handler(struct acrn_vcpu *vcpu);
static int32_t wbinvd_vmexit_handler(struct acrn_vcpu *vcpu);
static int32_t undefined_vmexit_handler(struct acrn_vcpu *vcpu);
static int32_t pause_vmexit_handler(__unused struct acrn_vcpu *vcpu);
/* VM Dispatch table for Exit condition handling */
static const struct vm_exit_dispatch dispatch_table[NR_VMX_EXIT_REASONS] = {
@ -113,7 +114,7 @@ static const struct vm_exit_dispatch dispatch_table[NR_VMX_EXIT_REASONS] = {
[VMX_EXIT_REASON_MONITOR] = {
.handler = unhandled_vmexit_handler},
[VMX_EXIT_REASON_PAUSE] = {
.handler = unhandled_vmexit_handler},
.handler = pause_vmexit_handler},
[VMX_EXIT_REASON_ENTRY_FAILURE_MACHINE_CHECK] = {
.handler = unhandled_vmexit_handler},
[VMX_EXIT_REASON_TPR_BELOW_THRESHOLD] = {
@ -277,6 +278,12 @@ static int32_t triple_fault_vmexit_handler(struct acrn_vcpu *vcpu)
return 0;
}
static int32_t pause_vmexit_handler(__unused struct acrn_vcpu *vcpu)
{
yield_current();
return 0;
}
int32_t cpuid_vmexit_handler(struct acrn_vcpu *vcpu)
{
uint64_t rax, rbx, rcx, rdx;