| Message ID | 20210528090752.3542186-2-npiggin@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | KVM: PPC: Book3S: C-ify the P9 entry/exit code | expand |
Nicholas Piggin <npiggin@gmail.com> writes: > 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. > > Acked-by: Paul Mackerras <paulus@ozlabs.org> > Reviewed-by: Daniel Axtens <dja@axtens.net> > Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com> > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> > --- > arch/powerpc/kernel/exceptions-64s.S | 8 +----- > arch/powerpc/kvm/Makefile | 3 +++ > arch/powerpc/kvm/book3s_64_entry.S | 36 +++++++++++++++++++++++++ > arch/powerpc/kvm/book3s_hv_rmhandlers.S | 11 ++------ > 4 files changed, 42 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 fa8e52a0239e..868077f7a96f 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 > + Further we down we have: obj-y += $(kvm-book3s_64-builtin-objs-y) Which means book3s_64_entry.S ends up getting built for BOOKE, which breaks. I think instead we want to add it to the preceding entry, eg: diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile index 91eb67bb91e1..ab241317481c 100644 --- a/arch/powerpc/kvm/Makefile +++ b/arch/powerpc/kvm/Makefile @@ -57,11 +57,9 @@ kvm-pr-y := \ book3s_32_mmu.o kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \ + book3s_64_entry.o \ tm.o -kvm-book3s_64-builtin-objs-y += \ - book3s_64_entry.o - ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HANDLER) += \ book3s_rmhandlers.o cheers
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index fa8e52a0239e..868077f7a96f 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -208,7 +208,6 @@ do_define_int n .endm #ifdef CONFIG_KVM_BOOK3S_64_HANDLER -#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE /* * All interrupts which set HSRR registers, as well as SRESET and MCE and * syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken, @@ -238,13 +237,8 @@ do_define_int n /* * If an interrupt is taken while a guest is running, it is immediately routed - * to KVM to handle. If both HV and PR KVM arepossible, KVM interrupts go first - * to kvmppc_interrupt_hv, which handles the PR guest case. + * to KVM to handle. */ -#define kvmppc_interrupt kvmppc_interrupt_hv -#else -#define kvmppc_interrupt kvmppc_interrupt_pr -#endif .macro KVMTEST name lbz r10,HSTATE_IN_GUEST(r13) diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile index 2bfeaa13befb..cdd119028f64 100644 --- a/arch/powerpc/kvm/Makefile +++ b/arch/powerpc/kvm/Makefile @@ -59,6 +59,9 @@ kvm-pr-y := \ kvm-book3s_64-builtin-objs-$(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..7a039ea78f15 --- /dev/null +++ b/arch/powerpc/kvm/book3s_64_entry.S @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#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 004f0d4e665f..a28b41b1bb38 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -1272,16 +1272,8 @@ 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) @@ -3287,6 +3279,7 @@ 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