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Subject[PATCHv2 9/9] KVM: x86 emulator: implement RDPMC (0F 33)
Date
From: Avi Kivity <avi@redhat.com>

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
arch/x86/include/asm/kvm_emulate.h | 1 +
arch/x86/kvm/emulate.c | 13 ++++++++++++-
arch/x86/kvm/x86.c | 7 +++++++
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 9a4acf4..ab4092e 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 c0ee85b..d76a852 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2623,6 +2623,17 @@ 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;
@@ -3254,7 +3265,7 @@ static struct opcode twobyte_table[256] = {
DI(ImplicitOps | Priv, wrmsr),
IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
DI(ImplicitOps | Priv, 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 3c9c8c9..9ca94d1 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4655,6 +4655,12 @@ 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;
@@ -4707,6 +4713,7 @@ 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,
--
1.7.5.3


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