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KVM: PPC: Clean up redundant kvm_run parameters in assembly

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In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
structure. For historical reasons, many kvm-related function parameters
retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time. This
patch does a unified cleanup of these remaining redundant parameters.

[paulus@ozlabs.org - Fixed places that were missed in book3s_interrupts.S]

Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Tianjia Zhang 2020-06-23 21:14:16 +08:00 committed by Paul Mackerras
parent 1508c22f11
commit 7ec21d9da5
6 changed files with 45 additions and 50 deletions
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2
arch/powerpc/include/asm/kvm_ppc.h
View File

@ -59,7 +59,7 @@ enum xlate_readwrite {
};
extern int kvmppc_vcpu_run(struct kvm_vcpu *vcpu);
extern int __kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu);
extern int __kvmppc_vcpu_run(struct kvm_vcpu *vcpu);
extern void kvmppc_handler_highmem(void);
extern void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu);

56
arch/powerpc/kvm/book3s_interrupts.S
View File

@ -55,8 +55,7 @@
****************************************************************************/
/* Registers:
* r3: kvm_run pointer
* r4: vcpu pointer
* r3: vcpu pointer
*/
_GLOBAL(__kvmppc_vcpu_run)
@ -68,8 +67,8 @@ kvm_start_entry:
/* Save host state to the stack */
PPC_STLU r1, -SWITCH_FRAME_SIZE(r1)
/* Save r3 (kvm_run) and r4 (vcpu) */
SAVE_2GPRS(3, r1)
/* Save r3 (vcpu) */
SAVE_GPR(3, r1)
/* Save non-volatile registers (r14 - r31) */
SAVE_NVGPRS(r1)
@ -82,47 +81,46 @@ kvm_start_entry:
PPC_STL r0, _LINK(r1)
/* Load non-volatile guest state from the vcpu */
VCPU_LOAD_NVGPRS(r4)
VCPU_LOAD_NVGPRS(r3)
kvm_start_lightweight:
/* Copy registers into shadow vcpu so we can access them in real mode */
mr r3, r4
bl FUNC(kvmppc_copy_to_svcpu)
nop
REST_GPR(4, r1)
REST_GPR(3, r1)
#ifdef CONFIG_PPC_BOOK3S_64
/* Get the dcbz32 flag */
PPC_LL r3, VCPU_HFLAGS(r4)
rldicl r3, r3, 0, 63 /* r3 &= 1 */
stb r3, HSTATE_RESTORE_HID5(r13)
PPC_LL r0, VCPU_HFLAGS(r3)
rldicl r0, r0, 0, 63 /* r3 &= 1 */
stb r0, HSTATE_RESTORE_HID5(r13)
/* Load up guest SPRG3 value, since it's user readable */
lwz r3, VCPU_SHAREDBE(r4)
cmpwi r3, 0
ld r5, VCPU_SHARED(r4)
lbz r4, VCPU_SHAREDBE(r3)
cmpwi r4, 0
ld r5, VCPU_SHARED(r3)
beq sprg3_little_endian
sprg3_big_endian:
#ifdef __BIG_ENDIAN__
ld r3, VCPU_SHARED_SPRG3(r5)
ld r4, VCPU_SHARED_SPRG3(r5)
#else
addi r5, r5, VCPU_SHARED_SPRG3
ldbrx r3, 0, r5
ldbrx r4, 0, r5
#endif
b after_sprg3_load
sprg3_little_endian:
#ifdef __LITTLE_ENDIAN__
ld r3, VCPU_SHARED_SPRG3(r5)
ld r4, VCPU_SHARED_SPRG3(r5)
#else
addi r5, r5, VCPU_SHARED_SPRG3
ldbrx r3, 0, r5
ldbrx r4, 0, r5
#endif
after_sprg3_load:
mtspr SPRN_SPRG3, r3
mtspr SPRN_SPRG3, r4
#endif /* CONFIG_PPC_BOOK3S_64 */
PPC_LL r4, VCPU_SHADOW_MSR(r4) /* get shadow_msr */
PPC_LL r4, VCPU_SHADOW_MSR(r3) /* get shadow_msr */
/* Jump to segment patching handler and into our guest */
bl FUNC(kvmppc_entry_trampoline)
@ -146,7 +144,7 @@ after_sprg3_load:
*
*/
PPC_LL r3, GPR4(r1) /* vcpu pointer */
PPC_LL r3, GPR3(r1) /* vcpu pointer */
/*
* kvmppc_copy_from_svcpu can clobber volatile registers, save
@ -169,7 +167,7 @@ after_sprg3_load:
#endif /* CONFIG_PPC_BOOK3S_64 */
/* R7 = vcpu */
PPC_LL r7, GPR4(r1)
PPC_LL r7, GPR3(r1)
PPC_STL r14, VCPU_GPR(R14)(r7)
PPC_STL r15, VCPU_GPR(R15)(r7)
@ -190,11 +188,11 @@ after_sprg3_load:
PPC_STL r30, VCPU_GPR(R30)(r7)
PPC_STL r31, VCPU_GPR(R31)(r7)
/* Pass the exit number as 3rd argument to kvmppc_handle_exit */
lwz r5, VCPU_TRAP(r7)
/* Pass the exit number as 2nd argument to kvmppc_handle_exit */
lwz r4, VCPU_TRAP(r7)
/* Restore r3 (kvm_run) and r4 (vcpu) */
REST_2GPRS(3, r1)
/* Restore r3 (vcpu) */
REST_GPR(3, r1)
bl FUNC(kvmppc_handle_exit_pr)
/* If RESUME_GUEST, get back in the loop */
@ -223,11 +221,11 @@ kvm_loop_heavyweight:
PPC_LL r4, _LINK(r1)
PPC_STL r4, (PPC_LR_STKOFF + SWITCH_FRAME_SIZE)(r1)
/* Load vcpu and cpu_run */
REST_2GPRS(3, r1)
/* Load vcpu */
REST_GPR(3, r1)
/* Load non-volatile guest state from the vcpu */
VCPU_LOAD_NVGPRS(r4)
VCPU_LOAD_NVGPRS(r3)
/* Jump back into the beginning of this function */
b kvm_start_lightweight
@ -235,7 +233,7 @@ kvm_loop_heavyweight:
kvm_loop_lightweight:
/* We'll need the vcpu pointer */
REST_GPR(4, r1)
REST_GPR(3, r1)
/* Jump back into the beginning of this function */
b kvm_start_lightweight

9
arch/powerpc/kvm/book3s_pr.c
View File

@ -1151,9 +1151,9 @@ static int kvmppc_exit_pr_progint(struct kvm_vcpu *vcpu, unsigned int exit_nr)
return r;
}
int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int exit_nr)
int kvmppc_handle_exit_pr(struct kvm_vcpu *vcpu, unsigned int exit_nr)
{
struct kvm_run *run = vcpu->run;
int r = RESUME_HOST;
int s;
@ -1826,7 +1826,6 @@ static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
static int kvmppc_vcpu_run_pr(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
int ret;
#ifdef CONFIG_ALTIVEC
unsigned long uninitialized_var(vrsave);
@ -1834,7 +1833,7 @@ static int kvmppc_vcpu_run_pr(struct kvm_vcpu *vcpu)
/* Check if we can run the vcpu at all */
if (!vcpu->arch.sane) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
ret = -EINVAL;
goto out;
}
@ -1861,7 +1860,7 @@ static int kvmppc_vcpu_run_pr(struct kvm_vcpu *vcpu)
kvmppc_fix_ee_before_entry();
ret = __kvmppc_vcpu_run(run, vcpu);
ret = __kvmppc_vcpu_run(vcpu);
kvmppc_clear_debug(vcpu);

9
arch/powerpc/kvm/booke.c
View File

@ -731,12 +731,11 @@ int kvmppc_core_check_requests(struct kvm_vcpu *vcpu)
int kvmppc_vcpu_run(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
int ret, s;
struct debug_reg debug;
if (!vcpu->arch.sane) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return -EINVAL;
}
@ -778,7 +777,7 @@ int kvmppc_vcpu_run(struct kvm_vcpu *vcpu)
vcpu->arch.pgdir = vcpu->kvm->mm->pgd;
kvmppc_fix_ee_before_entry();
ret = __kvmppc_vcpu_run(run, vcpu);
ret = __kvmppc_vcpu_run(vcpu);
/* No need for guest_exit. It's done in handle_exit.
We also get here with interrupts enabled. */
@ -982,9 +981,9 @@ static int kvmppc_resume_inst_load(struct kvm_vcpu *vcpu,
*
* Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
*/
int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int exit_nr)
int kvmppc_handle_exit(struct kvm_vcpu *vcpu, unsigned int exit_nr)
{
struct kvm_run *run = vcpu->run;
int r = RESUME_HOST;
int s;
int idx;

9
arch/powerpc/kvm/booke_interrupts.S
View File

@ -237,7 +237,7 @@ _GLOBAL(kvmppc_resume_host)
/* Switch to kernel stack and jump to handler. */
LOAD_REG_ADDR(r3, kvmppc_handle_exit)
mtctr r3
lwz r3, HOST_RUN(r1)
mr r3, r4
lwz r2, HOST_R2(r1)
mr r14, r4 /* Save vcpu pointer. */
@ -337,15 +337,14 @@ heavyweight_exit:
/* Registers:
* r3: kvm_run pointer
* r4: vcpu pointer
* r3: vcpu pointer
*/
_GLOBAL(__kvmppc_vcpu_run)
stwu r1, -HOST_STACK_SIZE(r1)
stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
stw r1, VCPU_HOST_STACK(r3) /* Save stack pointer to vcpu. */
/* Save host state to stack. */
stw r3, HOST_RUN(r1)
mr r4, r3
mflr r3
stw r3, HOST_STACK_LR(r1)
mfcr r5

10
arch/powerpc/kvm/bookehv_interrupts.S
View File

@ -434,9 +434,10 @@ _GLOBAL(kvmppc_resume_host)
#endif
/* Switch to kernel stack and jump to handler. */
PPC_LL r3, HOST_RUN(r1)
mr r3, r4
mr r5, r14 /* intno */
mr r14, r4 /* Save vcpu pointer. */
mr r4, r5
bl kvmppc_handle_exit
/* Restore vcpu pointer and the nonvolatiles we used. */
@ -525,15 +526,14 @@ heavyweight_exit:
blr
/* Registers:
* r3: kvm_run pointer
* r4: vcpu pointer
* r3: vcpu pointer
*/
_GLOBAL(__kvmppc_vcpu_run)
stwu r1, -HOST_STACK_SIZE(r1)
PPC_STL r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
PPC_STL r1, VCPU_HOST_STACK(r3) /* Save stack pointer to vcpu. */
/* Save host state to stack. */
PPC_STL r3, HOST_RUN(r1)
mr r4, r3
mflr r3
mfcr r5
PPC_STL r3, HOST_STACK_LR(r1)