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KVM: MIPS/VZ: Support guest hardware page table walker 

Add support for VZ guest CP0_PWBase, CP0_PWField, CP0_PWSize, and
CP0_PWCtl registers for controlling the guest hardware page table walker
(HTW) present on P5600 and P6600 cores. These guest registers need
initialising on R6, context switching, and exposing via the KVM ioctl
API when they are present.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: linux-doc@vger.kernel.org
This commit is contained in:
James Hogan 2017-03-14 10:15:36 +00:00
parent 4b7de028e6
commit 5a2f352f34
3 changed files with 92 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/virtual/kvm/api.txt
View File

@ -2081,7 +2081,11 @@ registers, find a list below:
MIPS | KVM_REG_MIPS_CP0_SEGCTL0 | 64
MIPS | KVM_REG_MIPS_CP0_SEGCTL1 | 64
MIPS | KVM_REG_MIPS_CP0_SEGCTL2 | 64
MIPS | KVM_REG_MIPS_CP0_PWBASE | 64
MIPS | KVM_REG_MIPS_CP0_PWFIELD | 64
MIPS | KVM_REG_MIPS_CP0_PWSIZE | 64
MIPS | KVM_REG_MIPS_CP0_WIRED | 32
MIPS | KVM_REG_MIPS_CP0_PWCTL | 32
MIPS | KVM_REG_MIPS_CP0_HWRENA | 32
MIPS | KVM_REG_MIPS_CP0_BADVADDR | 64
MIPS | KVM_REG_MIPS_CP0_BADINSTR | 32

8
arch/mips/include/asm/kvm_host.h
View File

@ -42,7 +42,11 @@
#define KVM_REG_MIPS_CP0_SEGCTL0 MIPS_CP0_64(5, 2)
#define KVM_REG_MIPS_CP0_SEGCTL1 MIPS_CP0_64(5, 3)
#define KVM_REG_MIPS_CP0_SEGCTL2 MIPS_CP0_64(5, 4)
#define KVM_REG_MIPS_CP0_PWBASE MIPS_CP0_64(5, 5)
#define KVM_REG_MIPS_CP0_PWFIELD MIPS_CP0_64(5, 6)
#define KVM_REG_MIPS_CP0_PWSIZE MIPS_CP0_64(5, 7)
#define KVM_REG_MIPS_CP0_WIRED MIPS_CP0_32(6, 0)
#define KVM_REG_MIPS_CP0_PWCTL MIPS_CP0_32(6, 6)
#define KVM_REG_MIPS_CP0_HWRENA MIPS_CP0_32(7, 0)
#define KVM_REG_MIPS_CP0_BADVADDR MIPS_CP0_64(8, 0)
#define KVM_REG_MIPS_CP0_BADINSTR MIPS_CP0_32(8, 1)
@ -678,7 +682,11 @@ __BUILD_KVM_RW_HW(pagegrain, 32, MIPS_CP0_TLB_PG_MASK, 1)
__BUILD_KVM_RW_HW(segctl0, l, MIPS_CP0_TLB_PG_MASK, 2)
__BUILD_KVM_RW_HW(segctl1, l, MIPS_CP0_TLB_PG_MASK, 3)
__BUILD_KVM_RW_HW(segctl2, l, MIPS_CP0_TLB_PG_MASK, 4)
__BUILD_KVM_RW_HW(pwbase, l, MIPS_CP0_TLB_PG_MASK, 5)
__BUILD_KVM_RW_HW(pwfield, l, MIPS_CP0_TLB_PG_MASK, 6)
__BUILD_KVM_RW_HW(pwsize, l, MIPS_CP0_TLB_PG_MASK, 7)
__BUILD_KVM_RW_HW(wired, 32, MIPS_CP0_TLB_WIRED, 0)
__BUILD_KVM_RW_HW(pwctl, 32, MIPS_CP0_TLB_WIRED, 6)
__BUILD_KVM_RW_HW(hwrena, 32, MIPS_CP0_HWRENA, 0)
__BUILD_KVM_RW_HW(badvaddr, l, MIPS_CP0_BAD_VADDR, 0)
__BUILD_KVM_RW_HW(badinstr, 32, MIPS_CP0_BAD_VADDR, 1)

80
arch/mips/kvm/vz.c
View File

@ -1392,6 +1392,13 @@ static u64 kvm_vz_get_one_regs_segments[] = {
KVM_REG_MIPS_CP0_SEGCTL2,
};
static u64 kvm_vz_get_one_regs_htw[] = {
KVM_REG_MIPS_CP0_PWBASE,
KVM_REG_MIPS_CP0_PWFIELD,
KVM_REG_MIPS_CP0_PWSIZE,
KVM_REG_MIPS_CP0_PWCTL,
};
static u64 kvm_vz_get_one_regs_kscratch[] = {
KVM_REG_MIPS_CP0_KSCRATCH1,
KVM_REG_MIPS_CP0_KSCRATCH2,
@ -1416,6 +1423,8 @@ static unsigned long kvm_vz_num_regs(struct kvm_vcpu *vcpu)
ret += ARRAY_SIZE(kvm_vz_get_one_regs_contextconfig);
if (cpu_guest_has_segments)
ret += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
if (cpu_guest_has_htw)
ret += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
ret += __arch_hweight8(cpu_data[0].guest.kscratch_mask);
return ret;
@ -1461,6 +1470,12 @@ static int kvm_vz_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices)
return -EFAULT;
indices += ARRAY_SIZE(kvm_vz_get_one_regs_segments);
}
if (cpu_guest_has_htw) {
if (copy_to_user(indices, kvm_vz_get_one_regs_htw,
sizeof(kvm_vz_get_one_regs_htw)))
return -EFAULT;
indices += ARRAY_SIZE(kvm_vz_get_one_regs_htw);
}
for (i = 0; i < 6; ++i) {
if (!cpu_guest_has_kscr(i + 2))
continue;
@ -1564,9 +1579,29 @@ static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu,
return -EINVAL;
*v = read_gc0_segctl2();
break;
case KVM_REG_MIPS_CP0_PWBASE:
if (!cpu_guest_has_htw)
return -EINVAL;
*v = read_gc0_pwbase();
break;
case KVM_REG_MIPS_CP0_PWFIELD:
if (!cpu_guest_has_htw)
return -EINVAL;
*v = read_gc0_pwfield();
break;
case KVM_REG_MIPS_CP0_PWSIZE:
if (!cpu_guest_has_htw)
return -EINVAL;
*v = read_gc0_pwsize();
break;
case KVM_REG_MIPS_CP0_WIRED:
*v = (long)read_gc0_wired();
break;
case KVM_REG_MIPS_CP0_PWCTL:
if (!cpu_guest_has_htw)
return -EINVAL;
*v = read_gc0_pwctl();
break;
case KVM_REG_MIPS_CP0_HWRENA:
*v = (long)read_gc0_hwrena();
break;
@ -1746,9 +1781,29 @@ static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu,
return -EINVAL;
write_gc0_segctl2(v);
break;
case KVM_REG_MIPS_CP0_PWBASE:
if (!cpu_guest_has_htw)
return -EINVAL;
write_gc0_pwbase(v);
break;
case KVM_REG_MIPS_CP0_PWFIELD:
if (!cpu_guest_has_htw)
return -EINVAL;
write_gc0_pwfield(v);
break;
case KVM_REG_MIPS_CP0_PWSIZE:
if (!cpu_guest_has_htw)
return -EINVAL;
write_gc0_pwsize(v);
break;
case KVM_REG_MIPS_CP0_WIRED:
change_gc0_wired(MIPSR6_WIRED_WIRED, v);
break;
case KVM_REG_MIPS_CP0_PWCTL:
if (!cpu_guest_has_htw)
return -EINVAL;
write_gc0_pwctl(v);
break;
case KVM_REG_MIPS_CP0_HWRENA:
write_gc0_hwrena(v);
break;
@ -2179,6 +2234,14 @@ static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
kvm_restore_gc0_segctl2(cop0);
}
/* restore HTW registers */
if (cpu_guest_has_htw) {
kvm_restore_gc0_pwbase(cop0);
kvm_restore_gc0_pwfield(cop0);
kvm_restore_gc0_pwsize(cop0);
kvm_restore_gc0_pwctl(cop0);
}
/* restore Root.GuestCtl2 from unused Guest guestctl2 register */
if (cpu_has_guestctl2)
write_c0_guestctl2(
@ -2268,6 +2331,15 @@ static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
kvm_save_gc0_segctl2(cop0);
}
/* save HTW registers if enabled in guest */
if (cpu_guest_has_htw &&
kvm_read_sw_gc0_config3(cop0) & MIPS_CONF3_PW) {
kvm_save_gc0_pwbase(cop0);
kvm_save_gc0_pwfield(cop0);
kvm_save_gc0_pwsize(cop0);
kvm_save_gc0_pwctl(cop0);
}
kvm_vz_save_timer(vcpu);
/* save Root.GuestCtl2 in unused Guest guestctl2 register */
@ -2596,6 +2668,14 @@ static int kvm_vz_vcpu_setup(struct kvm_vcpu *vcpu)
kvm_write_sw_gc0_segctl2(cop0, 0x00380438);
}
/* reset HTW registers */
if (cpu_guest_has_htw && cpu_has_mips_r6) {
/* PWField */
kvm_write_sw_gc0_pwfield(cop0, 0x0c30c302);
/* PWSize */
kvm_write_sw_gc0_pwsize(cop0, 1 << MIPS_PWSIZE_PTW_SHIFT);
}
/* start with no pending virtual guest interrupts */
if (cpu_has_guestctl2)
cop0->reg[MIPS_CP0_GUESTCTL2][MIPS_CP0_GUESTCTL2_SEL] = 0;