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[Qemu-riscv] [PATCH v1 17/27] target/riscv: Add hypvervisor trap support
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From: |
Alistair Francis |
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Subject: |
[Qemu-riscv] [PATCH v1 17/27] target/riscv: Add hypvervisor trap support |
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Date: |
Fri, 7 Jun 2019 14:56:14 -0700 |
Signed-off-by: Alistair Francis <address@hidden>
---
target/riscv/cpu_bits.h | 4 +--
target/riscv/cpu_helper.c | 71 +++++++++++++++++++++++++++++++++------
target/riscv/csr.c | 4 +--
3 files changed, 65 insertions(+), 14 deletions(-)
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 28117bdd32..8966c1bff6 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -508,8 +508,8 @@
#define RISCV_EXCP_STORE_AMO_ADDR_MIS 0x6
#define RISCV_EXCP_STORE_AMO_ACCESS_FAULT 0x7
#define RISCV_EXCP_U_ECALL 0x8
-#define RISCV_EXCP_S_ECALL 0x9
-#define RISCV_EXCP_H_ECALL 0xa
+#define RISCV_EXCP_HS_ECALL 0x9
+#define RISCV_EXCP_VS_ECALL 0xa
#define RISCV_EXCP_M_ECALL 0xb
#define RISCV_EXCP_INST_PAGE_FAULT 0xc /* since: priv-1.10.0 */
#define RISCV_EXCP_LOAD_PAGE_FAULT 0xd /* since: priv-1.10.0 */
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 6d6fff83a3..d1f73396e4 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -605,6 +605,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
RISCVCPU *cpu = RISCV_CPU(cs);
CPURISCVState *env = &cpu->env;
+ target_ulong s;
/* cs->exception is 32-bits wide unlike mcause which is XLEN-bits wide
* so we mask off the MSB and separate into trap type and cause.
@@ -614,13 +615,6 @@ void riscv_cpu_do_interrupt(CPUState *cs)
target_ulong deleg = async ? env->mideleg : env->medeleg;
target_ulong tval = 0;
- static const int ecall_cause_map[] = {
- [PRV_U] = RISCV_EXCP_U_ECALL,
- [PRV_S] = RISCV_EXCP_S_ECALL,
- [PRV_H] = RISCV_EXCP_H_ECALL,
- [PRV_M] = RISCV_EXCP_M_ECALL
- };
-
if (!async) {
/* set tval to badaddr for traps with address information */
switch (cause) {
@@ -641,7 +635,16 @@ void riscv_cpu_do_interrupt(CPUState *cs)
/* ecall is dispatched as one cause so translate based on mode */
if (cause == RISCV_EXCP_U_ECALL) {
assert(env->priv <= 3);
- cause = ecall_cause_map[env->priv];
+
+ if (env->priv == PRV_M) {
+ cause = RISCV_EXCP_M_ECALL;
+ } else if (env->priv == PRV_S && riscv_cpu_virt_enabled(env)) {
+ cause = RISCV_EXCP_VS_ECALL;
+ } else if (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) {
+ cause = RISCV_EXCP_HS_ECALL;
+ } else if (env->priv == PRV_U) {
+ cause = RISCV_EXCP_U_ECALL;
+ }
}
}
@@ -651,7 +654,42 @@ void riscv_cpu_do_interrupt(CPUState *cs)
if (env->priv <= PRV_S &&
cause < TARGET_LONG_BITS && ((deleg >> cause) & 1)) {
/* handle the trap in S-mode */
- target_ulong s = env->mstatus;
+ if (riscv_has_ext(env, RVH)) {
+ target_ulong hdeleg = async ? env->hideleg : env->hedeleg;
+
+ if (riscv_cpu_virt_enabled(env) && ((hdeleg >> cause) & 1) &&
+ !riscv_cpu_force_hs_excep_enabled(env)) {
+ /* Trap to VS mode */
+ } else if (riscv_cpu_virt_enabled(env)) {
+ /* Trap into HS mode, from virt */
+ riscv_cpu_swap_background_regs(env);
+ env->hstatus = set_field(env->hstatus, HSTATUS_SP2V,
+ get_field(env->hstatus, HSTATUS_SPV));
+ env->hstatus = set_field(env->hstatus, HSTATUS_SP2P,
+ get_field(env->mstatus, SSTATUS_SPP));
+ env->hstatus = set_field(env->hstatus, HSTATUS_SPV,
+ riscv_cpu_virt_enabled(env));
+
+ if (riscv_cpu_force_hs_excep_enabled(env)) {
+ env->hstatus = set_field(env->hstatus, HSTATUS_STL, 1);
+ } else {
+ env->hstatus = set_field(env->hstatus, HSTATUS_STL, 0);
+ }
+
+ riscv_cpu_set_virt_enabled(env, VIRT_OFF);
+ riscv_cpu_set_force_hs_excep(env, CLEAR_HS_EXCEP);
+ } else {
+ /* Trap into HS mode */
+ env->hstatus = set_field(env->hstatus, HSTATUS_SP2V,
+ get_field(env->hstatus, HSTATUS_SPV));
+ env->hstatus = set_field(env->hstatus, HSTATUS_SP2P,
+ get_field(env->mstatus, SSTATUS_SPP));
+ env->hstatus = set_field(env->hstatus, HSTATUS_SPV,
+ riscv_cpu_virt_enabled(env));
+ }
+ }
+
+ s = env->mstatus;
s = set_field(s, MSTATUS_SPIE, env->priv_ver >= PRIV_VERSION_1_10_0 ?
get_field(s, MSTATUS_SIE) : get_field(s, MSTATUS_UIE <<
env->priv));
s = set_field(s, MSTATUS_SPP, env->priv);
@@ -665,7 +703,20 @@ void riscv_cpu_do_interrupt(CPUState *cs)
riscv_cpu_set_mode(env, PRV_S);
} else {
/* handle the trap in M-mode */
- target_ulong s = env->mstatus;
+ if (riscv_has_ext(env, RVH)) {
+ if (riscv_cpu_virt_enabled(env)) {
+ riscv_cpu_swap_background_regs(env);
+ }
+ env->mstatus = set_field(env->mstatus, MSTATUS_MPV,
+ riscv_cpu_virt_enabled(env));
+ env->mstatus = set_field(env->mstatus, MSTATUS_MTL,
+ riscv_cpu_force_hs_excep_enabled(env));
+
+ /* Trapping to M mode, virt is disabled */
+ riscv_cpu_set_virt_enabled(env, VIRT_OFF);
+ }
+
+ s = env->mstatus;
s = set_field(s, MSTATUS_MPIE, env->priv_ver >= PRIV_VERSION_1_10_0 ?
get_field(s, MSTATUS_MIE) : get_field(s, MSTATUS_UIE <<
env->priv));
s = set_field(s, MSTATUS_MPP, env->priv);
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index c55eea44ec..9a1e29f39c 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -239,8 +239,8 @@ static const target_ulong delegable_excps =
(1ULL << (RISCV_EXCP_STORE_AMO_ADDR_MIS)) |
(1ULL << (RISCV_EXCP_STORE_AMO_ACCESS_FAULT)) |
(1ULL << (RISCV_EXCP_U_ECALL)) |
- (1ULL << (RISCV_EXCP_S_ECALL)) |
- (1ULL << (RISCV_EXCP_H_ECALL)) |
+ (1ULL << (RISCV_EXCP_VS_ECALL)) |
+ (1ULL << (RISCV_EXCP_HS_ECALL)) |
(1ULL << (RISCV_EXCP_M_ECALL)) |
(1ULL << (RISCV_EXCP_INST_PAGE_FAULT)) |
(1ULL << (RISCV_EXCP_LOAD_PAGE_FAULT)) |
--
2.21.0
- [Qemu-riscv] [PATCH v1 04/27] target/riscv: Add the force HS exception mode, (continued)
- [Qemu-riscv] [PATCH v1 04/27] target/riscv: Add the force HS exception mode, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 06/27] target/riscv: Dump Hypervisor registers if enabled, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 08/27] target/riscv: Create function to test if FP is enabled, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 09/27] target/riscv: Add support for background interrupt setting, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 10/27] target/riscv: Add Hypervisor CSR access functions, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 12/27] target/riscv: Add background register swapping function, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 13/27] target/ricsv: Flush the TLB on virtulisation mode changes, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 16/27] riscv: plic: Always set sip.SEIP bit for HS, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 11/27] target/riscv: Add background CSRs accesses, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 15/27] riscv: plic: Remove unused interrupt functions, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 17/27] target/riscv: Add hypvervisor trap support,
Alistair Francis <=
- [Qemu-riscv] [PATCH v1 18/27] target/riscv: Add Hypervisor trap return support, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 14/27] target/riscv: Generate illegal instruction on WFI when V=1, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 19/27] target/riscv: Add hfence instructions, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 22/27] target/riscv: Respect MPRV and SPRV for floating point ops, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 21/27] target/riscv: Mark both sstatus and bsstatus as dirty, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 23/27] target/riscv: Allow specifying MMU stage, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 25/27] target/riscv: Implement second stage MMU, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 24/27] target/riscv: Allow specifying number of MMU stages, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 20/27] target/riscv: Disable guest FP support based on backgrond status, Alistair Francis, 2019/06/07
- [Qemu-riscv] [PATCH v1 27/27] target/riscv: Allow enabling the Hypervisor extension, Alistair Francis, 2019/06/07