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lib: Add RISC-V hypervisor v0.6.1 support

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To support RISC-V hypervisor v0.6.1, we:
1. Don't need to explicitly forward WFI traps from VS/VU-mode
2. Have to delegate virtual instruction trap to HS-mode
3. Have to update trap redirection for changes in HSTATUS CSR

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-05-28 08:37:42 +05:30
committed by Anup Patel
parent 51f0e4a053
commit 1b8c0128f1
4 changed files with 17 additions and 19 deletions
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8
lib/sbi/sbi_trap.c
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@@ -120,12 +120,10 @@ int sbi_trap_redirect(struct sbi_trap_regs *regs,
/* Update HSTATUS for VS/VU-mode to HS-mode transition */
if (misa_extension('H') && prev_virt && !next_virt) {
/* Update HSTATUS SP2P, SP2V, and SPV bits */
/* Update HSTATUS SPVP and SPV bits */
hstatus = csr_read(CSR_HSTATUS);
hstatus &= ~HSTATUS_SP2P;
hstatus |= (regs->mstatus & MSTATUS_SPP) ? HSTATUS_SP2P : 0;
hstatus &= ~HSTATUS_SP2V;
hstatus |= (hstatus & HSTATUS_SPV) ? HSTATUS_SP2V : 0;
hstatus &= ~HSTATUS_SPVP;
hstatus |= (regs->mstatus & MSTATUS_SPP) ? HSTATUS_SPVP : 0;
hstatus &= ~HSTATUS_SPV;
hstatus |= (prev_virt) ? HSTATUS_SPV : 0;
csr_write(CSR_HSTATUS, hstatus);