linux-kernel - [PATCH v2 3/5] KVM: implement new perf interfaces

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Message-ID: <SY4P282MB108456E39C664F79EC0292249DCFA@SY4P282MB1084.AUSP282.PROD.OUTLOOK.COM>
Date:   Sun,  8 Oct 2023 22:56:10 +0800
From:   Tianyi Liu <i.pear@...look.com>
To:     seanjc@...gle.com, pbonzini@...hat.com, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        kvm@...r.kernel.org, x86@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
        Tianyi Liu <i.pear@...look.com>
Subject: [PATCH v2 3/5] KVM: implement new perf interfaces

This patch provides two KVM implementations for the following new perf
interfaces, just redirecting them to the arch-specific implementations:

- get_frame_pointer: Return the frame pointer of the running vm.
- read_virt: Read data from a virtual address of the running vm.

Signed-off-by: Tianyi Liu <i.pear@...look.com>
---
 virt/kvm/kvm_main.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 486800a70..6fd6ee6c0 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -6018,6 +6018,9 @@ static unsigned int kvm_guest_state(void)
 	if (!kvm_arch_vcpu_in_kernel(vcpu))
 		state |= PERF_GUEST_USER;
 
+	if (kvm_arch_vcpu_is_64bit(vcpu))
+		state |= PERF_GUEST_64BIT;
+
 	return state;
 }
 
@@ -6032,9 +6035,31 @@ static unsigned long kvm_guest_get_ip(void)
 	return kvm_arch_vcpu_get_ip(vcpu);
 }
 
+static unsigned long kvm_guest_get_frame_pointer(void)
+{
+	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
+
+	if (WARN_ON_ONCE(!kvm_arch_pmi_in_guest(vcpu)))
+		return 0;
+
+	return kvm_arch_vcpu_get_frame_pointer(vcpu);
+}
+
+static bool kvm_guest_read_virt(void *addr, void *dest, unsigned int length)
+{
+	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
+
+	if (WARN_ON_ONCE(!kvm_arch_pmi_in_guest(vcpu)))
+		return false;
+
+	return kvm_arch_vcpu_read_virt(vcpu, addr, dest, length);
+}
+
 static struct perf_guest_info_callbacks kvm_guest_cbs = {
 	.state			= kvm_guest_state,
 	.get_ip			= kvm_guest_get_ip,
+	.get_frame_pointer	= kvm_guest_get_frame_pointer,
+	.read_virt		= kvm_guest_read_virt,
 	.handle_intel_pt_intr	= NULL,
 };
 
-- 
2.42.0