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authorPaul Mackerras <paulus@samba.org>2011-07-23 03:41:44 -0400
committerAvi Kivity <avi@redhat.com>2011-09-25 12:52:29 -0400
commit02143947603fe90237a0423d34dd8943de229f78 (patch)
treeafcc617d3dd3378a1820de979ae6f59b16df7003 /arch/powerpc/kvm/book3s_exports.c
parent177339d7f7c99a25ecfdb6baeea6a2508fb2349f (diff)
KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode
This simplifies the way that the book3s_pr makes the transition to real mode when entering the guest. We now call kvmppc_entry_trampoline (renamed from kvmppc_rmcall) in the base kernel using a normal function call instead of doing an indirect call through a pointer in the vcpu. If kvm is a module, the module loader takes care of generating a trampoline as it does for other calls to functions outside the module. kvmppc_entry_trampoline then disables interrupts and jumps to kvmppc_handler_trampoline_enter in real mode using an rfi[d]. That then uses the link register as the address to return to (potentially in module space) when the guest exits. This also simplifies the way that we call the Linux interrupt handler when we exit the guest due to an external, decrementer or performance monitor interrupt. Instead of turning on the MMU, then deciding that we need to call the Linux handler and turning the MMU back off again, we now go straight to the handler at the point where we would turn the MMU on. The handler will then return to the virtual-mode code (potentially in the module). Along the way, this moves the setting and clearing of the HID5 DCBZ32 bit into real-mode interrupts-off code, and also makes sure that we clear the MSR[RI] bit before loading values into SRR0/1. The net result is that we no longer need any code addresses to be stored in vcpu->arch. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_exports.c')
-rw-r--r--arch/powerpc/kvm/book3s_exports.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/powerpc/kvm/book3s_exports.c b/arch/powerpc/kvm/book3s_exports.c
index 88c8f26add02..f7f63a00ab1f 100644
--- a/arch/powerpc/kvm/book3s_exports.c
+++ b/arch/powerpc/kvm/book3s_exports.c
@@ -23,9 +23,7 @@
23#ifdef CONFIG_KVM_BOOK3S_64_HV 23#ifdef CONFIG_KVM_BOOK3S_64_HV
24EXPORT_SYMBOL_GPL(kvmppc_hv_entry_trampoline); 24EXPORT_SYMBOL_GPL(kvmppc_hv_entry_trampoline);
25#else 25#else
26EXPORT_SYMBOL_GPL(kvmppc_handler_trampoline_enter); 26EXPORT_SYMBOL_GPL(kvmppc_entry_trampoline);
27EXPORT_SYMBOL_GPL(kvmppc_handler_lowmem_trampoline);
28EXPORT_SYMBOL_GPL(kvmppc_rmcall);
29EXPORT_SYMBOL_GPL(kvmppc_load_up_fpu); 27EXPORT_SYMBOL_GPL(kvmppc_load_up_fpu);
30#ifdef CONFIG_ALTIVEC 28#ifdef CONFIG_ALTIVEC
31EXPORT_SYMBOL_GPL(kvmppc_load_up_altivec); 29EXPORT_SYMBOL_GPL(kvmppc_load_up_altivec);