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9352e7470a
x86 Xen-for-KVM: * Allow the Xen runstate information to cross a page boundary * Allow XEN_RUNSTATE_UPDATE flag behaviour to be configured * add support for 32-bit guests in SCHEDOP_poll x86 fixes: * One-off fixes for various emulation flows (SGX, VMXON, NRIPS=0). * Reinstate IBPB on emulated VM-Exit that was incorrectly dropped a few years back when eliminating unnecessary barriers when switching between vmcs01 and vmcs02. * Clean up the MSR filter docs. * Clean up vmread_error_trampoline() to make it more obvious that params must be passed on the stack, even for x86-64. * Let userspace set all supported bits in MSR_IA32_FEAT_CTL irrespective of the current guest CPUID. * Fudge around a race with TSC refinement that results in KVM incorrectly thinking a guest needs TSC scaling when running on a CPU with a constant TSC, but no hardware-enumerated TSC frequency. * Advertise (on AMD) that the SMM_CTL MSR is not supported * Remove unnecessary exports Selftests: * Fix an inverted check in the access tracking perf test, and restore support for asserting that there aren't too many idle pages when running on bare metal. * Fix an ordering issue in the AMX test introduced by recent conversions to use kvm_cpu_has(), and harden the code to guard against similar bugs in the future. Anything that tiggers caching of KVM's supported CPUID, kvm_cpu_has() in this case, effectively hides opt-in XSAVE features if the caching occurs before the test opts in via prctl(). * Fix build errors that occur in certain setups (unsure exactly what is unique about the problematic setup) due to glibc overriding static_assert() to a variant that requires a custom message. * Introduce actual atomics for clear/set_bit() in selftests Documentation: * Remove deleted ioctls from documentation * Various fixes
104 lines
2.0 KiB
C
104 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include "kvm_util.h"
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#include "linux/types.h"
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#include "linux/bitmap.h"
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#include "linux/atomic.h"
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struct ucall_header {
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DECLARE_BITMAP(in_use, KVM_MAX_VCPUS);
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struct ucall ucalls[KVM_MAX_VCPUS];
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};
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/*
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* ucall_pool holds per-VM values (global data is duplicated by each VM), it
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* must not be accessed from host code.
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*/
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static struct ucall_header *ucall_pool;
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void ucall_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
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{
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struct ucall_header *hdr;
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struct ucall *uc;
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vm_vaddr_t vaddr;
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int i;
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vaddr = __vm_vaddr_alloc(vm, sizeof(*hdr), KVM_UTIL_MIN_VADDR, MEM_REGION_DATA);
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hdr = (struct ucall_header *)addr_gva2hva(vm, vaddr);
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memset(hdr, 0, sizeof(*hdr));
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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uc = &hdr->ucalls[i];
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uc->hva = uc;
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}
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write_guest_global(vm, ucall_pool, (struct ucall_header *)vaddr);
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ucall_arch_init(vm, mmio_gpa);
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}
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static struct ucall *ucall_alloc(void)
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{
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struct ucall *uc;
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int i;
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GUEST_ASSERT(ucall_pool);
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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if (!test_and_set_bit(i, ucall_pool->in_use)) {
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uc = &ucall_pool->ucalls[i];
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memset(uc->args, 0, sizeof(uc->args));
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return uc;
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}
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}
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GUEST_ASSERT(0);
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return NULL;
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}
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static void ucall_free(struct ucall *uc)
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{
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/* Beware, here be pointer arithmetic. */
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clear_bit(uc - ucall_pool->ucalls, ucall_pool->in_use);
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}
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void ucall(uint64_t cmd, int nargs, ...)
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{
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struct ucall *uc;
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va_list va;
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int i;
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uc = ucall_alloc();
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WRITE_ONCE(uc->cmd, cmd);
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nargs = min(nargs, UCALL_MAX_ARGS);
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va_start(va, nargs);
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for (i = 0; i < nargs; ++i)
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WRITE_ONCE(uc->args[i], va_arg(va, uint64_t));
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va_end(va);
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ucall_arch_do_ucall((vm_vaddr_t)uc->hva);
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ucall_free(uc);
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}
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uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc)
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{
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struct ucall ucall;
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void *addr;
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if (!uc)
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uc = &ucall;
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addr = ucall_arch_get_ucall(vcpu);
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if (addr) {
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memcpy(uc, addr, sizeof(*uc));
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vcpu_run_complete_io(vcpu);
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} else {
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memset(uc, 0, sizeof(*uc));
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}
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return uc->cmd;
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}
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