[kvm-ppc-devel] [PATCH] [2/4] Add per guest pvr (userspace)

[ehrhardt@linux.vnet.ibm.com]

Subject: [PATCH] [2/4] Add per guest pvr (userspace)
From: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>

This adds a per VM variable called pvr in imitation of the hardware spr. It
also adds a interface to get/set this variable to the vm ioctl. Atm it uses
non-real pvr values to allow us to differ on runtime e.g. between ppc440 and
e500 guests.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
---

 libkvm/libkvm-powerpc.c |   21 ++++++++++++++++++++-
 libkvm/libkvm.h         |    4 ++++
 qemu/vl.c               |    7 +++++++
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/libkvm/libkvm-powerpc.c b/libkvm/libkvm-powerpc.c
--- a/libkvm/libkvm-powerpc.c
+++ b/libkvm/libkvm-powerpc.c
@@ -25,6 +25,10 @@
 #include "kvm-powerpc.h"
 #include <errno.h>
 #include <stdio.h>
+#include <sys/ioctl.h>
+
+/* need to be available prior to kvm_arch_create and prior to qemu env setup */
+static struct kvm_pvr kvm_guest_pvr;
 
 int handle_dcr(struct kvm_run *run,  kvm_context_t kvm, int vcpu)
 {
@@ -85,10 +89,25 @@ void kvm_show_regs(kvm_context_t kvm, in
 	fflush(stdout);
 }
 
+void kvm_init_guest_pvr(uint32_t guest_pvr)
+{
+	kvm_guest_pvr.pvr = guest_pvr;
+}
+
 int kvm_arch_create(kvm_context_t kvm, unsigned long phys_mem_bytes,
 			 void **vm_mem)
 {
-	return 0;
+	int r = 0;
+
+	if (kvm_guest_pvr.pvr = 0)
+		/* we might want to set a useful default here */
+		fprintf(stderr, "%s warning - pvr not set\n", __func__);
+
+	r = ioctl(kvm->vm_fd, KVM_SET_GUEST_PVR, &kvm_guest_pvr);
+	if (r)
+		fprintf(stderr, "%s failed (r='%d')\n", __func__, r);
+
+	return r;
 }
 
 int kvm_arch_create_default_phys_mem(kvm_context_t kvm,
diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
--- a/libkvm/libkvm.h
+++ b/libkvm/libkvm.h
@@ -556,4 +556,8 @@ int kvm_enable_vapic(kvm_context_t kvm, 
 
 #endif
 
+#if defined(__powerpc__)
+void kvm_init_guest_pvr(uint32_t guest_pvr);
 #endif
+
+#endif
diff --git a/qemu/vl.c b/qemu/vl.c
--- a/qemu/vl.c
+++ b/qemu/vl.c
@@ -9319,6 +9319,13 @@ int main(int argc, char **argv)
 #else
 #define KVM_EXTRA_PAGES 0
 #endif
+
+#ifdef TARGET_PPC
+/* initialize wanted pvr in libkvm prior to first create call */
+if (machine = &bamboo_machine)
+	kvm_init_guest_pvr(KVM_PPC_PVR_PPC44X);
+#endif
+
     if (kvm_allowed) {
 	    phys_ram_size += KVM_EXTRA_PAGES * TARGET_PAGE_SIZE;
 	    if (kvm_qemu_create_context() < 0) {

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