Hi Nick, > Rather than bifurcate the call depending on whether or not HV is > possible, and have the HV entry test for PR, just make a single > common point which does the demultiplexing. This makes it simpler > to add another type of exit handler. > > Reviewed-by: Fabiano Rosas <faro...@linux.ibm.com>
I checked this against the RFC which I was happy with and there are no changes that I am concerned about. The expanded comment is also nice. As such: Reviewed-by: Daniel Axtens <d...@axtens.net> Kind regards, Daniel > Signed-off-by: Nicholas Piggin <npig...@gmail.com> > --- > arch/powerpc/kernel/exceptions-64s.S | 8 +----- > arch/powerpc/kvm/Makefile | 3 +++ > arch/powerpc/kvm/book3s_64_entry.S | 35 +++++++++++++++++++++++++ > arch/powerpc/kvm/book3s_hv_rmhandlers.S | 11 ++------ > 4 files changed, 41 insertions(+), 16 deletions(-) > create mode 100644 arch/powerpc/kvm/book3s_64_entry.S > > diff --git a/arch/powerpc/kernel/exceptions-64s.S > b/arch/powerpc/kernel/exceptions-64s.S > index 0097e0676ed7..ba13d749d203 100644 > --- a/arch/powerpc/kernel/exceptions-64s.S > +++ b/arch/powerpc/kernel/exceptions-64s.S > @@ -208,7 +208,6 @@ do_define_int n > .endm > > #ifdef CONFIG_KVM_BOOK3S_64_HANDLER > -#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE > /* > * All interrupts which set HSRR registers, as well as SRESET and MCE and > * syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken, > @@ -238,13 +237,8 @@ do_define_int n > > /* > * If an interrupt is taken while a guest is running, it is immediately > routed > - * to KVM to handle. If both HV and PR KVM arepossible, KVM interrupts go > first > - * to kvmppc_interrupt_hv, which handles the PR guest case. > + * to KVM to handle. > */ > -#define kvmppc_interrupt kvmppc_interrupt_hv > -#else > -#define kvmppc_interrupt kvmppc_interrupt_pr > -#endif > > .macro KVMTEST name > lbz r10,HSTATE_IN_GUEST(r13) > diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile > index 2bfeaa13befb..cdd119028f64 100644 > --- a/arch/powerpc/kvm/Makefile > +++ b/arch/powerpc/kvm/Makefile > @@ -59,6 +59,9 @@ kvm-pr-y := \ > kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \ > tm.o > > +kvm-book3s_64-builtin-objs-y += \ > + book3s_64_entry.o > + > ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE > kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \ > book3s_rmhandlers.o > diff --git a/arch/powerpc/kvm/book3s_64_entry.S > b/arch/powerpc/kvm/book3s_64_entry.S > new file mode 100644 > index 000000000000..e9a6a8fbb164 > --- /dev/null > +++ b/arch/powerpc/kvm/book3s_64_entry.S > @@ -0,0 +1,35 @@ > +#include <asm/asm-offsets.h> > +#include <asm/cache.h> > +#include <asm/kvm_asm.h> > +#include <asm/kvm_book3s_asm.h> > +#include <asm/ppc_asm.h> > +#include <asm/reg.h> > + > +/* > + * This is branched to from interrupt handlers in exception-64s.S which set > + * IKVM_REAL or IKVM_VIRT, if HSTATE_IN_GUEST was found to be non-zero. > + */ > +.global kvmppc_interrupt > +.balign IFETCH_ALIGN_BYTES > +kvmppc_interrupt: > + /* > + * Register contents: > + * R12 = (guest CR << 32) | interrupt vector > + * R13 = PACA > + * guest R12 saved in shadow VCPU SCRATCH0 > + * guest R13 saved in SPRN_SCRATCH0 > + */ > +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE > + std r9,HSTATE_SCRATCH2(r13) > + lbz r9,HSTATE_IN_GUEST(r13) > + cmpwi r9,KVM_GUEST_MODE_HOST_HV > + beq kvmppc_bad_host_intr > +#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE > + cmpwi r9,KVM_GUEST_MODE_GUEST > + ld r9,HSTATE_SCRATCH2(r13) > + beq kvmppc_interrupt_pr > +#endif > + b kvmppc_interrupt_hv > +#else > + b kvmppc_interrupt_pr > +#endif > diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S > b/arch/powerpc/kvm/book3s_hv_rmhandlers.S > index 5e634db4809b..f976efb7e4a9 100644 > --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S > +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S > @@ -1269,16 +1269,8 @@ kvmppc_interrupt_hv: > * R13 = PACA > * guest R12 saved in shadow VCPU SCRATCH0 > * guest R13 saved in SPRN_SCRATCH0 > + * guest R9 saved in HSTATE_SCRATCH2 > */ > - std r9, HSTATE_SCRATCH2(r13) > - lbz r9, HSTATE_IN_GUEST(r13) > - cmpwi r9, KVM_GUEST_MODE_HOST_HV > - beq kvmppc_bad_host_intr > -#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE > - cmpwi r9, KVM_GUEST_MODE_GUEST > - ld r9, HSTATE_SCRATCH2(r13) > - beq kvmppc_interrupt_pr > -#endif > /* We're now back in the host but in guest MMU context */ > li r9, KVM_GUEST_MODE_HOST_HV > stb r9, HSTATE_IN_GUEST(r13) > @@ -3280,6 +3272,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_P9_TM_HV_ASSIST) > * cfar is saved in HSTATE_CFAR(r13) > * ppr is saved in HSTATE_PPR(r13) > */ > +.global kvmppc_bad_host_intr > kvmppc_bad_host_intr: > /* > * Switch to the emergency stack, but start half-way down in > -- > 2.23.0
