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KVM: MIPS: Use lddir/ldpte instructions to lookup gpa_mm.pgd

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Loongson-3 can use lddir/ldpte instuctions to accelerate page table
walking, so use them to lookup gpa_mm.pgd.

Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Co-developed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <1590220602-3547-6-git-send-email-chenhc@lemote.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Huacai Chen 2020-05-23 15:56:32 +08:00 committed by Paolo Bonzini
parent bf10efbb81
commit 8bf3129503
1 changed files with 18 additions and 1 deletions
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19
arch/mips/kvm/entry.c
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@ -56,6 +56,7 @@
#define C0_BADVADDR 8, 0
#define C0_BADINSTR 8, 1
#define C0_BADINSTRP 8, 2
#define C0_PGD 9, 7
#define C0_ENTRYHI 10, 0
#define C0_GUESTCTL1 10, 4
#define C0_STATUS 12, 0
@ -307,7 +308,10 @@ static void *kvm_mips_build_enter_guest(void *addr)
#ifdef CONFIG_KVM_MIPS_VZ
/* Save normal linux process pgd (VZ guarantees pgd_reg is set) */
UASM_i_MFC0(&p, K0, c0_kscratch(), pgd_reg);
if (cpu_has_ldpte)
UASM_i_MFC0(&p, K0, C0_PWBASE);
else
UASM_i_MFC0(&p, K0, c0_kscratch(), pgd_reg);
UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu_arch, host_pgd), K1);
/*
@ -469,8 +473,10 @@ void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler)
u32 *p = addr;
struct uasm_label labels[2];
struct uasm_reloc relocs[2];
#ifndef CONFIG_CPU_LOONGSON64
struct uasm_label *l = labels;
struct uasm_reloc *r = relocs;
#endif
memset(labels, 0, sizeof(labels));
memset(relocs, 0, sizeof(relocs));
@ -490,6 +496,16 @@ void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler)
*/
preempt_disable();
#ifdef CONFIG_CPU_LOONGSON64
UASM_i_MFC0(&p, K1, C0_PGD);
uasm_i_lddir(&p, K0, K1, 3); /* global page dir */
#ifndef __PAGETABLE_PMD_FOLDED
uasm_i_lddir(&p, K1, K0, 1); /* middle page dir */
#endif
uasm_i_ldpte(&p, K1, 0); /* even */
uasm_i_ldpte(&p, K1, 1); /* odd */
uasm_i_tlbwr(&p);
#else
/*
* Now for the actual refill bit. A lot of this can be common with the
* Linux TLB refill handler, however we don't need to handle so many
@ -512,6 +528,7 @@ void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler)
build_get_ptep(&p, K0, K1);
build_update_entries(&p, K0, K1);
build_tlb_write_entry(&p, &l, &r, tlb_random);
#endif
preempt_enable();