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KVM: arm64: Handle FFA_MEM_LEND calls from the host

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Handle FFA_MEM_LEND calls from the host by treating them identically to
FFA_MEM_SHARE calls for the purposes of the host stage-2 page-table, but
forwarding on the original request to EL3.

Signed-off-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230523101828.7328-9-will@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Will Deacon 2023-05-23 11:18:25 +01:00 committed by Oliver Upton
parent 0e3bcb49c1
commit 634d90cf0a
1 changed files with 15 additions and 7 deletions
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22
arch/arm64/kvm/hyp/nvhe/ffa.c
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@ -116,10 +116,10 @@ static int ffa_unmap_hyp_buffers(void)
return res.a0 == FFA_SUCCESS ? FFA_RET_SUCCESS : res.a2;
}
static void ffa_mem_share(struct arm_smccc_res *res, u32 len, u32 fraglen)
static void ffa_mem_xfer(struct arm_smccc_res *res, u64 func_id, u32 len,
u32 fraglen)
{
arm_smccc_1_1_smc(FFA_FN64_MEM_SHARE,
len, fraglen,
arm_smccc_1_1_smc(func_id, len, fraglen,
0, 0, 0, 0, 0,
res);
}
@ -321,8 +321,9 @@ static int ffa_host_unshare_ranges(struct ffa_mem_region_addr_range *ranges,
return ret;
}
static void do_ffa_mem_share(struct arm_smccc_res *res,
struct kvm_cpu_context *ctxt)
static __always_inline void do_ffa_mem_xfer(const u64 func_id,
struct arm_smccc_res *res,
struct kvm_cpu_context *ctxt)
{
DECLARE_REG(u32, len, ctxt, 1);
DECLARE_REG(u32, fraglen, ctxt, 2);
@ -333,6 +334,9 @@ static void do_ffa_mem_share(struct arm_smccc_res *res,
int ret = 0;
u32 offset;
BUILD_BUG_ON(func_id != FFA_FN64_MEM_SHARE &&
func_id != FFA_FN64_MEM_LEND);
if (addr_mbz || npages_mbz || fraglen > len ||
fraglen > KVM_FFA_MBOX_NR_PAGES * PAGE_SIZE) {
ret = FFA_RET_INVALID_PARAMETERS;
@ -382,7 +386,7 @@ static void do_ffa_mem_share(struct arm_smccc_res *res,
if (ret)
goto out_unlock;
ffa_mem_share(res, len, fraglen);
ffa_mem_xfer(res, func_id, len, fraglen);
if (res->a0 != FFA_SUCCESS) {
WARN_ON(ffa_host_unshare_ranges(reg->constituents,
reg->addr_range_cnt));
@ -519,11 +523,15 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt)
goto out_handled;
case FFA_MEM_SHARE:
case FFA_FN64_MEM_SHARE:
do_ffa_mem_share(&res, host_ctxt);
do_ffa_mem_xfer(FFA_FN64_MEM_SHARE, &res, host_ctxt);
goto out_handled;
case FFA_MEM_RECLAIM:
do_ffa_mem_reclaim(&res, host_ctxt);
goto out_handled;
case FFA_MEM_LEND:
case FFA_FN64_MEM_LEND:
do_ffa_mem_xfer(FFA_FN64_MEM_LEND, &res, host_ctxt);
goto out_handled;
}
if (ffa_call_supported(func_id))