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[Qemu-devel] [PATCH 09/22] pseries: Add device tree properties for VMX/V
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PATCH 09/22] pseries: Add device tree properties for VMX/VSX and DFP under kvm |
Date: |
Sun, 30 Oct 2011 21:23:00 +0100 |
From: David Gibson <address@hidden>
Sufficiently recent PAPR specifications define properties "ibm,vmx"
and "ibm,dfp" on the CPU node which advertise whether the VMX vector
extensions (or the later VSX version) and/or the Decimal Floating
Point operations from IBM's recent POWER CPUs are available.
Currently we do not put these in the guest device tree and the guest
kernel will consequently assume they are not available. This is good,
because they are not supported under TCG. VMX is similar enough to
Altivec that it might be trivial to support, but VSX and DFP would
both require significant work to support in TCG.
However, when running under kvm on a host which supports these
instructions, there's no reason not to let the guest use them. This
patch, therefore, checks for the relevant support on the host CPU
and, if present, advertises them to the guest as well.
Signed-off-by: David Gibson <address@hidden>
Signed-off-by: Alexander Graf <address@hidden>
---
hw/spapr.c | 17 +++++++++++++++++
target-ppc/kvm.c | 10 ++++++++++
target-ppc/kvm_ppc.h | 12 ++++++++++++
3 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/hw/spapr.c b/hw/spapr.c
index 193398b..4d2a55e 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -188,6 +188,8 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
0xffffffff, 0xffffffff};
uint32_t tbfreq = kvm_enabled() ? kvmppc_get_tbfreq() : TIMEBASE_FREQ;
uint32_t cpufreq = kvm_enabled() ? kvmppc_get_clockfreq() : 1000000000;
+ uint32_t vmx = kvm_enabled() ? kvmppc_get_vmx() : 0;
+ uint32_t dfp = kvm_enabled() ? kvmppc_get_dfp() : 0;
if ((index % smt) != 0) {
continue;
@@ -235,6 +237,21 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
segs, sizeof(segs))));
}
+ /* Advertise VMX/VSX (vector extensions) if available
+ * 0 / no property == no vector extensions
+ * 1 == VMX / Altivec available
+ * 2 == VSX available */
+ if (vmx) {
+ _FDT((fdt_property_cell(fdt, "ibm,vmx", vmx)));
+ }
+
+ /* Advertise DFP (Decimal Floating Point) if available
+ * 0 / no property == no DFP
+ * 1 == DFP available */
+ if (dfp) {
+ _FDT((fdt_property_cell(fdt, "ibm,dfp", dfp)));
+ }
+
_FDT((fdt_end_node(fdt)));
}
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index c48cd76..96139ac 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -694,6 +694,16 @@ uint64_t kvmppc_get_clockfreq(void)
return kvmppc_read_int_cpu_dt("clock-frequency");
}
+uint32_t kvmppc_get_vmx(void)
+{
+ return kvmppc_read_int_cpu_dt("ibm,vmx");
+}
+
+uint32_t kvmppc_get_dfp(void)
+{
+ return kvmppc_read_int_cpu_dt("ibm,dfp");
+}
+
int kvmppc_get_hypercall(CPUState *env, uint8_t *buf, int buf_len)
{
uint32_t *hc = (uint32_t*)buf;
diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
index 87d1bdd..955729a 100644
--- a/target-ppc/kvm_ppc.h
+++ b/target-ppc/kvm_ppc.h
@@ -17,6 +17,8 @@ void kvmppc_init(void);
uint32_t kvmppc_get_tbfreq(void);
uint64_t kvmppc_get_clockfreq(void);
+uint32_t kvmppc_get_vmx(void);
+uint32_t kvmppc_get_dfp(void);
int kvmppc_get_hypercall(CPUState *env, uint8_t *buf, int buf_len);
int kvmppc_set_interrupt(CPUState *env, int irq, int level);
void kvmppc_set_papr(CPUState *env);
@@ -37,6 +39,16 @@ static inline uint64_t kvmppc_get_clockfreq(void)
return 0;
}
+static inline uint32_t kvmppc_get_vmx(void)
+{
+ return 0;
+}
+
+static inline uint32_t kvmppc_get_dfp(void)
+{
+ return 0;
+}
+
static inline int kvmppc_get_hypercall(CPUState *env, uint8_t *buf, int
buf_len)
{
return -1;
--
1.6.0.2
- [Qemu-devel] [PULL 00/22] ppc patch queue 2011-10-30, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 02/22] ppc/e500_pci: Fix an array overflow issue, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 01/22] ppc/e500_pci: Fix code style, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 03/22] pseries: Support SMT systems for KVM Book3S-HV, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 04/22] pseries: Allow KVM Book3S-HV on PPC970 CPUS, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 05/22] pseries: Use Book3S-HV TCE acceleration capabilities, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 06/22] pseries: Update SLOF firmware image, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 13/22] ppc: Add cpu defs for POWER7 revisions 2.1 and 2.3, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 09/22] pseries: Add device tree properties for VMX/VSX and DFP under kvm,
Alexander Graf <=
- [Qemu-devel] [PATCH 15/22] PPC: Bump qemu-system-ppc to 64-bit physical address space, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 07/22] Set an invalid-bits mask for each SPE instructions, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 18/22] PPC: Fail configure when libfdt is not available, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 17/22] ppc: Avoid decrementer related kvm exits, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 11/22] ppc: Remove broken partial PVR matching, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 21/22] KVM: PPC: Override host vmx/vsx/dfp only when information known, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 14/22] pseries: Under kvm use guest cpu = host cpu by default, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 08/22] ppc: Generalize the kvmppc_get_clockfreq() function, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 22/22] pseries: Allow writes to KVM accelerated TCE table, Alexander Graf, 2011/10/30
- [Qemu-devel] [PATCH 12/22] ppc: First cut implementation of -cpu host, Alexander Graf, 2011/10/30