[RFC PATCH 45/73] KVM: x86/PVM: Add dummy PMU related callbacks

Lai Jiangshan
2024-02-26T14:37:05Z

Currently, PMU virtualization is not implemented, so dummy PMU related
callbacks are added to make PVM work. In the future, the existing code
in pmu_intel.c and pmu_amd.c will be reused to implement PMU
virtualization for PVM.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
---
arch/x86/kvm/pvm/pvm.c | 72 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)

diff --git a/arch/x86/kvm/pvm/pvm.c b/arch/x86/kvm/pvm/pvm.c
index f2cd1a1c199d..e6464095d40b 100644
--- a/arch/x86/kvm/pvm/pvm.c
+++ b/arch/x86/kvm/pvm/pvm.c
@@ -21,6 +21,7 @@
#include "cpuid.h"
#include "lapic.h"
#include "mmu.h"
+#include "pmu.h"
#include "trace.h"
#include "x86.h"
#include "pvm.h"
@@ -2701,6 +2702,76 @@ static void hardware_unsetup(void)
{
}

+//====== start of dummy pmu ===========
+//TODO: split kvm-pmu-intel.ko & kvm-pmu-amd.ko from kvm-intel.ko & kvm-amd.ko.
+static bool dummy_pmu_hw_event_available(struct kvm_pmc *pmc)
+{
+ return true;
+}
+
+static struct kvm_pmc *dummy_pmc_idx_to_pmc(struct kvm_pmu *pmu, int pmc_idx)
+{
+ return NULL;
+}
+
+static struct kvm_pmc *dummy_pmu_rdpmc_ecx_to_pmc(struct kvm_vcpu *vcpu,
+ unsigned int idx, u64 *mask)
+{
+ return NULL;
+}
+
+static bool dummy_pmu_is_valid_rdpmc_ecx(struct kvm_vcpu *vcpu, unsigned int idx)
+{
+ return false;
+}
+
+static struct kvm_pmc *dummy_pmu_msr_idx_to_pmc(struct kvm_vcpu *vcpu, u32 msr)
+{
+ return NULL;
+}
+
+static bool dummy_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
+{
+ return 0;
+}
+
+static int dummy_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
+{
+ return 1;
+}
+
+static int dummy_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
+{
+ return 1;
+}
+
+static void dummy_pmu_refresh(struct kvm_vcpu *vcpu)
+{
+}
+
+static void dummy_pmu_init(struct kvm_vcpu *vcpu)
+{
+}
+
+static void dummy_pmu_reset(struct kvm_vcpu *vcpu)
+{
+}
+
+struct kvm_pmu_ops dummy_pmu_ops = {
+ .hw_event_available = dummy_pmu_hw_event_available,
+ .pmc_idx_to_pmc = dummy_pmc_idx_to_pmc,
+ .rdpmc_ecx_to_pmc = dummy_pmu_rdpmc_ecx_to_pmc,
+ .msr_idx_to_pmc = dummy_pmu_msr_idx_to_pmc,
+ .is_valid_rdpmc_ecx = dummy_pmu_is_valid_rdpmc_ecx,
+ .is_valid_msr = dummy_pmu_is_valid_msr,
+ .get_msr = dummy_pmu_get_msr,
+ .set_msr = dummy_pmu_set_msr,
+ .refresh = dummy_pmu_refresh,
+ .init = dummy_pmu_init,
+ .reset = dummy_pmu_reset,
+};
+//========== end of dummy pmu =============
+
struct kvm_x86_nested_ops pvm_nested_ops = {};

static struct kvm_x86_ops pvm_x86_ops __initdata = {
@@ -2811,6 +2882,7 @@ static struct kvm_x86_init_ops pvm_init_ops __initdata = {
.hardware_setup = hardware_setup,

.runtime_ops = &pvm_x86_ops,
+ .pmu_ops = &dummy_pmu_ops,
};

static void pvm_exit(void)
--
2.19.1.6.gb485710b