KVM: x86 emulator: implement RDPMC (0F 33)

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

3 files changed, 20 insertions, 1 deletions

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index 9a4acf41709c..ab4092e3214e 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -181,6 +181,7 @@ struct x86_emulate_ops {
         int (*set_dr)(struct x86_emulate_ctxt *ctxt, int dr, ulong value);
         int (*set_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data);
         int (*get_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata);
+        int (*read_pmc)(struct x86_emulate_ctxt *ctxt, u32 pmc, u64 *pdata);
         void (*halt)(struct x86_emulate_ctxt *ctxt);
         void (*wbinvd)(struct x86_emulate_ctxt *ctxt);
         int (*fix_hypercall)(struct x86_emulate_ctxt *ctxt);
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index d270f1a817dc..05a562b85025 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2645,6 +2645,17 @@ static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
         return X86EMUL_CONTINUE;
 }
 
+static int em_rdpmc(struct x86_emulate_ctxt *ctxt)
+{
+        u64 pmc;
+
+        if (ctxt->ops->read_pmc(ctxt, ctxt->regs[VCPU_REGS_RCX], &pmc))
+                return emulate_gp(ctxt, 0);
+        ctxt->regs[VCPU_REGS_RAX] = (u32)pmc;
+        ctxt->regs[VCPU_REGS_RDX] = pmc >> 32;
+        return X86EMUL_CONTINUE;
+}
+
 static int em_mov(struct x86_emulate_ctxt *ctxt)
 {
         ctxt->dst.val = ctxt->src.val;
@@ -3411,7 +3422,7 @@ static struct opcode twobyte_table[256] = {
         II(ImplicitOps | Priv, em_wrmsr, wrmsr),
         IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
         II(ImplicitOps | Priv, em_rdmsr, rdmsr),
-        DIP(ImplicitOps, rdpmc, check_rdpmc),
+        IIP(ImplicitOps, em_rdpmc, rdpmc, check_rdpmc),
         I(ImplicitOps | VendorSpecific, em_sysenter),
         I(ImplicitOps | Priv | VendorSpecific, em_sysexit),
         N, N,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 27d18b7617f3..1171def5f96b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4146,6 +4146,12 @@ static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
         return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data);
 }
 
+static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
+                             u32 pmc, u64 *pdata)
+{
+        return kvm_pmu_read_pmc(emul_to_vcpu(ctxt), pmc, pdata);
+}
+
 static void emulator_halt(struct x86_emulate_ctxt *ctxt)
 {
         emul_to_vcpu(ctxt)->arch.halt_request = 1;
@@ -4198,6 +4204,7 @@ static struct x86_emulate_ops emulate_ops = {
         .set_dr              = emulator_set_dr,
         .set_msr             = emulator_set_msr,
         .get_msr             = emulator_get_msr,
+        .read_pmc            = emulator_read_pmc,
         .halt                = emulator_halt,
         .wbinvd              = emulator_wbinvd,
         .fix_hypercall       = emulator_fix_hypercall,