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ppc/xive: Implement TM_PULL_OS_CTX special command

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When a vCPU is not dispatched anymore on a HW thread, the Hypervisor
(KVM on Linux) invalidates the OS interrupt context of a vCPU with
this special command. It returns the OS CAM line value and resets the
VO bit.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190718115420.19919-4-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2019-07-18 13:54:06 +02:00 committed by David Gibson
parent 1994d3aa47
commit d98ec603c6
1 changed files with 14 additions and 1 deletions
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15
hw/intc/xive.c
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@ -337,6 +337,17 @@ static void xive_tm_set_os_pending(XiveTCTX *tctx, hwaddr offset,
xive_tctx_notify(tctx, TM_QW1_OS);
}
static uint64_t xive_tm_pull_os_ctx(XiveTCTX *tctx, hwaddr offset,
unsigned size)
{
uint32_t qw1w2_prev = xive_tctx_word2(&tctx->regs[TM_QW1_OS]);
uint32_t qw1w2;
qw1w2 = xive_set_field32(TM_QW1W2_VO, qw1w2_prev, 0);
memcpy(&tctx->regs[TM_QW1_OS + TM_WORD2], &qw1w2, 4);
return qw1w2;
}
/*
* Define a mapping of "special" operations depending on the TIMA page
* offset and the size of the operation.
@ -363,6 +374,8 @@ static const XiveTmOp xive_tm_operations[] = {
/* MMIOs above 2K : special operations with side effects */
{ XIVE_TM_OS_PAGE, TM_SPC_ACK_OS_REG, 2, NULL, xive_tm_ack_os_reg },
{ XIVE_TM_OS_PAGE, TM_SPC_SET_OS_PENDING, 1, xive_tm_set_os_pending, NULL },
{ XIVE_TM_HV_PAGE, TM_SPC_PULL_OS_CTX, 4, NULL, xive_tm_pull_os_ctx },
{ XIVE_TM_HV_PAGE, TM_SPC_PULL_OS_CTX, 8, NULL, xive_tm_pull_os_ctx },
{ XIVE_TM_HV_PAGE, TM_SPC_ACK_HV_REG, 2, NULL, xive_tm_ack_hv_reg },
{ XIVE_TM_HV_PAGE, TM_SPC_PULL_POOL_CTX, 4, NULL, xive_tm_pull_pool_ctx },
{ XIVE_TM_HV_PAGE, TM_SPC_PULL_POOL_CTX, 8, NULL, xive_tm_pull_pool_ctx },
@ -406,7 +419,7 @@ void xive_tctx_tm_write(XiveTCTX *tctx, hwaddr offset, uint64_t value,
if (offset & 0x800) {
xto = xive_tm_find_op(offset, size, true);
if (!xto) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid write access at TIMA"
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid write access at TIMA "
"@%"HWADDR_PRIx"\n", offset);
} else {
xto->write_handler(tctx, offset, value, size);