[PATCH v3 27/27] KVM: arm64: nv: Add support for HCRX_EL2
Marc Zyngier
maz at kernel.org
Tue Aug 8 04:47:11 PDT 2023
HCRX_EL2 has an interesting effect on HFGITR_EL2, as it conditions
the traps of TLBI*nXS.
Expand the FGT support to add a new Fine Grained Filter that will
get checked when the instruction gets trapped, allowing the shadow
register to override the trap as needed.
Signed-off-by: Marc Zyngier <maz at kernel.org>
---
arch/arm64/include/asm/kvm_arm.h | 5 ++
arch/arm64/include/asm/kvm_host.h | 1 +
arch/arm64/kvm/emulate-nested.c | 94 ++++++++++++++++---------
arch/arm64/kvm/hyp/include/hyp/switch.h | 15 +++-
arch/arm64/kvm/nested.c | 3 +-
arch/arm64/kvm/sys_regs.c | 2 +
6 files changed, 83 insertions(+), 37 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index d229f238c3b6..137f732789c9 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -369,6 +369,11 @@
#define __HDFGWTR_EL2_MASK ~__HDFGWTR_EL2_nMASK
#define __HDFGWTR_EL2_nMASK GENMASK(62, 60)
+/* Similar definitions for HCRX_EL2 */
+#define __HCRX_EL2_RES0 (GENMASK(63, 16) | GENMASK(13, 12))
+#define __HCRX_EL2_MASK (0)
+#define __HCRX_EL2_nMASK (GENMASK(15, 14) | GENMASK(4, 0))
+
/* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
#define HPFAR_MASK (~UL(0xf))
/*
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index cb1c5c54cedd..93c541111dea 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -380,6 +380,7 @@ enum vcpu_sysreg {
CPTR_EL2, /* Architectural Feature Trap Register (EL2) */
HSTR_EL2, /* Hypervisor System Trap Register */
HACR_EL2, /* Hypervisor Auxiliary Control Register */
+ HCRX_EL2, /* Extended Hypervisor Configuration Register */
TTBR0_EL2, /* Translation Table Base Register 0 (EL2) */
TTBR1_EL2, /* Translation Table Base Register 1 (EL2) */
TCR_EL2, /* Translation Control Register (EL2) */
diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index 4497666db45d..35f2f051af97 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c
@@ -425,11 +425,13 @@ static const complex_condition_check ccc[] = {
* [13:10] enum fgt_group_id (4 bits)
* [19:14] bit number in the FGT register (6 bits)
* [20] trap polarity (1 bit)
- * [62:21] Unused (42 bits)
+ * [25:21] FG filter (5 bits)
+ * [62:26] Unused (37 bits)
* [63] RES0 - Must be zero, as lost on insertion in the xarray
*/
#define TC_CGT_BITS 10
#define TC_FGT_BITS 4
+#define TC_FGF_BITS 5
union trap_config {
u64 val;
@@ -438,7 +440,8 @@ union trap_config {
unsigned long fgt:TC_FGT_BITS; /* Fing Grained Trap id */
unsigned long bit:6; /* Bit number */
unsigned long pol:1; /* Polarity */
- unsigned long unk:42; /* Unknown */
+ unsigned long fgf:TC_FGF_BITS; /* Fine Grained Filter */
+ unsigned long unk:37; /* Unknown */
unsigned long mbz:1; /* Must Be Zero */
};
};
@@ -939,7 +942,15 @@ enum fgt_group_id {
__NR_FGT_GROUP_IDS__
};
-#define SR_FGT(sr, g, b, p) \
+enum fg_filter_id {
+ __NO_FGF__,
+ HCRX_FGTnXS,
+
+ /* Must be last */
+ __NR_FG_FILTER_IDS__
+};
+
+#define SR_FGF(sr, g, b, p, f) \
{ \
.encoding = sr, \
.end = sr, \
@@ -947,9 +958,12 @@ enum fgt_group_id {
.fgt = g ## _GROUP, \
.bit = g ## _EL2_ ## b ## _SHIFT, \
.pol = p, \
+ .fgf = f, \
}, \
}
+#define SR_FGT(sr, g, b, p) SR_FGF(sr, g, b, p, __NO_FGF__)
+
static const struct encoding_to_trap_config encoding_to_fgt[] __initconst = {
/* HFGRTR_EL2, HFGWTR_EL2 */
SR_FGT(SYS_TPIDR2_EL0, HFGxTR, nTPIDR2_EL0, 0),
@@ -1053,37 +1067,37 @@ static const struct encoding_to_trap_config encoding_to_fgt[] __initconst = {
SR_FGT(OP_TLBI_ASIDE1OS, HFGITR, TLBIASIDE1OS, 1),
SR_FGT(OP_TLBI_VAE1OS, HFGITR, TLBIVAE1OS, 1),
SR_FGT(OP_TLBI_VMALLE1OS, HFGITR, TLBIVMALLE1OS, 1),
- /* FIXME: nXS variants must be checked against HCRX_EL2.FGTnXS */
- SR_FGT(OP_TLBI_VAALE1NXS, HFGITR, TLBIVAALE1, 1),
- SR_FGT(OP_TLBI_VALE1NXS, HFGITR, TLBIVALE1, 1),
- SR_FGT(OP_TLBI_VAAE1NXS, HFGITR, TLBIVAAE1, 1),
- SR_FGT(OP_TLBI_ASIDE1NXS, HFGITR, TLBIASIDE1, 1),
- SR_FGT(OP_TLBI_VAE1NXS, HFGITR, TLBIVAE1, 1),
- SR_FGT(OP_TLBI_VMALLE1NXS, HFGITR, TLBIVMALLE1, 1),
- SR_FGT(OP_TLBI_RVAALE1NXS, HFGITR, TLBIRVAALE1, 1),
- SR_FGT(OP_TLBI_RVALE1NXS, HFGITR, TLBIRVALE1, 1),
- SR_FGT(OP_TLBI_RVAAE1NXS, HFGITR, TLBIRVAAE1, 1),
- SR_FGT(OP_TLBI_RVAE1NXS, HFGITR, TLBIRVAE1, 1),
- SR_FGT(OP_TLBI_RVAALE1ISNXS, HFGITR, TLBIRVAALE1IS, 1),
- SR_FGT(OP_TLBI_RVALE1ISNXS, HFGITR, TLBIRVALE1IS, 1),
- SR_FGT(OP_TLBI_RVAAE1ISNXS, HFGITR, TLBIRVAAE1IS, 1),
- SR_FGT(OP_TLBI_RVAE1ISNXS, HFGITR, TLBIRVAE1IS, 1),
- SR_FGT(OP_TLBI_VAALE1ISNXS, HFGITR, TLBIVAALE1IS, 1),
- SR_FGT(OP_TLBI_VALE1ISNXS, HFGITR, TLBIVALE1IS, 1),
- SR_FGT(OP_TLBI_VAAE1ISNXS, HFGITR, TLBIVAAE1IS, 1),
- SR_FGT(OP_TLBI_ASIDE1ISNXS, HFGITR, TLBIASIDE1IS, 1),
- SR_FGT(OP_TLBI_VAE1ISNXS, HFGITR, TLBIVAE1IS, 1),
- SR_FGT(OP_TLBI_VMALLE1ISNXS, HFGITR, TLBIVMALLE1IS, 1),
- SR_FGT(OP_TLBI_RVAALE1OSNXS, HFGITR, TLBIRVAALE1OS, 1),
- SR_FGT(OP_TLBI_RVALE1OSNXS, HFGITR, TLBIRVALE1OS, 1),
- SR_FGT(OP_TLBI_RVAAE1OSNXS, HFGITR, TLBIRVAAE1OS, 1),
- SR_FGT(OP_TLBI_RVAE1OSNXS, HFGITR, TLBIRVAE1OS, 1),
- SR_FGT(OP_TLBI_VAALE1OSNXS, HFGITR, TLBIVAALE1OS, 1),
- SR_FGT(OP_TLBI_VALE1OSNXS, HFGITR, TLBIVALE1OS, 1),
- SR_FGT(OP_TLBI_VAAE1OSNXS, HFGITR, TLBIVAAE1OS, 1),
- SR_FGT(OP_TLBI_ASIDE1OSNXS, HFGITR, TLBIASIDE1OS, 1),
- SR_FGT(OP_TLBI_VAE1OSNXS, HFGITR, TLBIVAE1OS, 1),
- SR_FGT(OP_TLBI_VMALLE1OSNXS, HFGITR, TLBIVMALLE1OS, 1),
+ /* nXS variants must be checked against HCRX_EL2.FGTnXS */
+ SR_FGF(OP_TLBI_VAALE1NXS, HFGITR, TLBIVAALE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VALE1NXS, HFGITR, TLBIVALE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VAAE1NXS, HFGITR, TLBIVAAE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_ASIDE1NXS, HFGITR, TLBIASIDE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VAE1NXS, HFGITR, TLBIVAE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VMALLE1NXS, HFGITR, TLBIVMALLE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAALE1NXS, HFGITR, TLBIRVAALE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVALE1NXS, HFGITR, TLBIRVALE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAAE1NXS, HFGITR, TLBIRVAAE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAE1NXS, HFGITR, TLBIRVAE1, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAALE1ISNXS, HFGITR, TLBIRVAALE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVALE1ISNXS, HFGITR, TLBIRVALE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAAE1ISNXS, HFGITR, TLBIRVAAE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAE1ISNXS, HFGITR, TLBIRVAE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VAALE1ISNXS, HFGITR, TLBIVAALE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VALE1ISNXS, HFGITR, TLBIVALE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VAAE1ISNXS, HFGITR, TLBIVAAE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_ASIDE1ISNXS, HFGITR, TLBIASIDE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VAE1ISNXS, HFGITR, TLBIVAE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VMALLE1ISNXS, HFGITR, TLBIVMALLE1IS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAALE1OSNXS, HFGITR, TLBIRVAALE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVALE1OSNXS, HFGITR, TLBIRVALE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAAE1OSNXS, HFGITR, TLBIRVAAE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_RVAE1OSNXS, HFGITR, TLBIRVAE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VAALE1OSNXS, HFGITR, TLBIVAALE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VALE1OSNXS, HFGITR, TLBIVALE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VAAE1OSNXS, HFGITR, TLBIVAAE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_ASIDE1OSNXS, HFGITR, TLBIASIDE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VAE1OSNXS, HFGITR, TLBIVAE1OS, 1, HCRX_FGTnXS),
+ SR_FGF(OP_TLBI_VMALLE1OSNXS, HFGITR, TLBIVMALLE1OS, 1, HCRX_FGTnXS),
SR_FGT(OP_AT_S1E1WP, HFGITR, ATS1E1WP, 1),
SR_FGT(OP_AT_S1E1RP, HFGITR, ATS1E1RP, 1),
SR_FGT(OP_AT_S1E0W, HFGITR, ATS1E0W, 1),
@@ -1598,6 +1612,7 @@ int __init populate_nv_trap_config(void)
BUILD_BUG_ON(sizeof(union trap_config) != sizeof(void *));
BUILD_BUG_ON(__NR_TRAP_GROUP_IDS__ > BIT(TC_CGT_BITS));
BUILD_BUG_ON(__NR_FGT_GROUP_IDS__ > BIT(TC_FGT_BITS));
+ BUILD_BUG_ON(__NR_FG_FILTER_IDS__ > BIT(TC_FGF_BITS));
for (int i = 0; i < ARRAY_SIZE(encoding_to_cgt); i++) {
const struct encoding_to_trap_config *cgt = &encoding_to_cgt[i];
@@ -1779,6 +1794,17 @@ bool __check_nv_sr_forward(struct kvm_vcpu *vcpu)
case HFGITR_GROUP:
val = sanitised_sys_reg(vcpu, HFGITR_EL2);
+ switch (tc.fgf) {
+ u64 tmp;
+
+ case __NO_FGF__:
+ break;
+
+ case HCRX_FGTnXS:
+ tmp = sanitised_sys_reg(vcpu, HCRX_EL2);
+ if (tmp & HCRX_EL2_FGTnXS)
+ tc.fgt = __NO_FGT_GROUP__;
+ }
break;
case __NR_FGT_GROUP_IDS__:
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 060c5a0409e5..3acf6d77e324 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -197,8 +197,19 @@ static inline void __activate_traps_common(struct kvm_vcpu *vcpu)
vcpu->arch.mdcr_el2_host = read_sysreg(mdcr_el2);
write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);
- if (cpus_have_final_cap(ARM64_HAS_HCX))
- write_sysreg_s(HCRX_GUEST_FLAGS, SYS_HCRX_EL2);
+ if (cpus_have_final_cap(ARM64_HAS_HCX)) {
+ u64 hcrx = HCRX_GUEST_FLAGS;
+ if (vcpu_has_nv(vcpu) && !is_hyp_ctxt(vcpu)) {
+ u64 clr = 0, set = 0;
+
+ compute_clr_set(vcpu, HCRX_EL2, clr, set);
+
+ hcrx |= set;
+ hcrx &= ~clr;
+ }
+
+ write_sysreg_s(hcrx, SYS_HCRX_EL2);
+ }
__activate_traps_hfgxtr(vcpu);
}
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index 3facd8918ae3..042695a210ce 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -117,7 +117,8 @@ void access_nested_id_reg(struct kvm_vcpu *v, struct sys_reg_params *p,
break;
case SYS_ID_AA64MMFR1_EL1:
- val &= (NV_FTR(MMFR1, PAN) |
+ val &= (NV_FTR(MMFR1, HCX) |
+ NV_FTR(MMFR1, PAN) |
NV_FTR(MMFR1, LO) |
NV_FTR(MMFR1, HPDS) |
NV_FTR(MMFR1, VH) |
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index dfd72b3a625f..374b21f08fc3 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2372,6 +2372,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
EL2_REG(HFGITR_EL2, access_rw, reset_val, 0),
EL2_REG(HACR_EL2, access_rw, reset_val, 0),
+ EL2_REG(HCRX_EL2, access_rw, reset_val, 0),
+
EL2_REG(TTBR0_EL2, access_rw, reset_val, 0),
EL2_REG(TTBR1_EL2, access_rw, reset_val, 0),
EL2_REG(TCR_EL2, access_rw, reset_val, TCR_EL2_RES1),
--
2.34.1
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