KVM: x86: announce KVM_FEATURE_ASYNC_PF_INT (72de5fa4) · Commits · 戴 / test

Documentation/virt/kvm/cpuid.rst

+6 −0

Original line number	Diff line number	Diff line
		@@ -86,6 +86,12 @@ KVM_FEATURE_PV_SCHED_YIELD 13 guest checks this feature bit
		before using paravirtualized
		sched yield.

		KVM_FEATURE_ASYNC_PF_INT 14 guest checks this feature bit
		before using the second async
		pf control msr 0x4b564d06 and
		async pf acknowledgment msr
		0x4b564d07.

		KVM_FEATURE_CLOCSOURCE_STABLE_BIT 24 host will warn if no guest-side
		per-cpu warps are expeced in
		kvmclock

Documentation/virt/kvm/msr.rst

+8 −4

Original line number	Diff line number	Diff line
		@@ -213,7 +213,8 @@ data:
		cpl == 0. Bit 2 is 1 if asynchronous page faults are delivered to L1 as
		#PF vmexits. Bit 2 can be set only if KVM_FEATURE_ASYNC_PF_VMEXIT is
		present in CPUID. Bit 3 enables interrupt based delivery of 'page ready'
		events.
		events. Bit 3 can only be set if KVM_FEATURE_ASYNC_PF_INT is present in
		CPUID.

		'Page not present' events are currently always delivered as synthetic
		#PF exception. During delivery of these events APF CR2 register contains
		@@ -242,7 +243,8 @@ data:

		Note, MSR_KVM_ASYNC_PF_INT MSR specifying the interrupt vector for 'page
		ready' APF delivery needs to be written to before enabling APF mechanism
		in MSR_KVM_ASYNC_PF_EN or interrupt #0 can get injected.
		in MSR_KVM_ASYNC_PF_EN or interrupt #0 can get injected. The MSR is
		available if KVM_FEATURE_ASYNC_PF_INT is present in CPUID.

		Note, previously, 'page ready' events were delivered via the same #PF
		exception as 'page not present' events but this is now deprecated. If
		@@ -360,7 +362,8 @@ data:

		Interrupt vector for asynchnonous 'page ready' notifications delivery.
		The vector has to be set up before asynchronous page fault mechanism
		is enabled in MSR_KVM_ASYNC_PF_EN.
		is enabled in MSR_KVM_ASYNC_PF_EN. The MSR is only available if
		KVM_FEATURE_ASYNC_PF_INT is present in CPUID.

		MSR_KVM_ASYNC_PF_ACK:
		0x4b564d07
		@@ -371,4 +374,5 @@ data:
		When the guest is done processing 'page ready' APF event and 'token'
		field in 'struct kvm_vcpu_pv_apf_data' is cleared it is supposed to
		write '1' to bit 0 of the MSR, this causes the host to re-scan its queue
		and check if there are more notifications pending.
		and check if there are more notifications pending. The MSR is available
		if KVM_FEATURE_ASYNC_PF_INT is present in CPUID.

arch/x86/include/uapi/asm/kvm_para.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,7 @@
		#define KVM_FEATURE_PV_SEND_IPI 11
		#define KVM_FEATURE_POLL_CONTROL 12
		#define KVM_FEATURE_PV_SCHED_YIELD 13
		#define KVM_FEATURE_ASYNC_PF_INT 14

		#define KVM_HINTS_REALTIME 0

arch/x86/kvm/cpuid.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -711,7 +711,8 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
		(1 << KVM_FEATURE_ASYNC_PF_VMEXIT) \|
		(1 << KVM_FEATURE_PV_SEND_IPI) \|
		(1 << KVM_FEATURE_POLL_CONTROL) \|
		(1 << KVM_FEATURE_PV_SCHED_YIELD);
		(1 << KVM_FEATURE_PV_SCHED_YIELD) \|
		(1 << KVM_FEATURE_ASYNC_PF_INT);

		if (sched_info_on())
		entry->eax \|= (1 << KVM_FEATURE_STEAL_TIME);

arch/x86/kvm/x86.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -3446,6 +3446,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
		case KVM_CAP_X86_ROBUST_SINGLESTEP:
		case KVM_CAP_XSAVE:
		case KVM_CAP_ASYNC_PF:
		case KVM_CAP_ASYNC_PF_INT:
		case KVM_CAP_GET_TSC_KHZ:
		case KVM_CAP_KVMCLOCK_CTRL:
		case KVM_CAP_READONLY_MEM:

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